lab_4 complete

SmallSoftwareProject/SmallSoftwareBusinessLogic/Implementations/ManufacturerBusinessLogicContract.cs

@@ -0,0 +1,68 @@
+using SmallSoftwareContracts.BusinessLogicsContracts;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.StoragesContracts;
+using Microsoft.Extensions.Logging;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.Extensions;
+using System.Text.Json;
+
+namespace SmallSoftwareBusinessLogic.Implementations;
+
+internal class ManufacturerBusinessLogicContract(IManufacturerStorageContract
+manufacturerStorageContract, ILogger logger) : IManufacturerBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly IManufacturerStorageContract _manufacturerStorageContract
+    = manufacturerStorageContract;
+    public List<ManufacturerDataModel> GetAllManufacturers()
+    {
+        _logger.LogInformation("GetAllManufacturers");
+        return _manufacturerStorageContract.GetList() ?? throw new
+        NullListException();
+    }
+    public ManufacturerDataModel GetManufacturerByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _manufacturerStorageContract.GetElementById(data) ??
+            throw new ElementNotFoundException(data);
+        }
+        return _manufacturerStorageContract.GetElementByName(data) ??
+        _manufacturerStorageContract.GetElementByOldName(data) ??
+        throw new ElementNotFoundException(data);
+    }
+    public void InsertManufacturer(ManufacturerDataModel manufacturerDataModel)
+    {
+        _logger.LogInformation("New data: {json}",
+        JsonSerializer.Serialize(manufacturerDataModel));
+        ArgumentNullException.ThrowIfNull(manufacturerDataModel);
+        manufacturerDataModel.Validate();
+        _manufacturerStorageContract.AddElement(manufacturerDataModel); 
+    }
+    public void UpdateManufacturer(ManufacturerDataModel manufacturerDataModel)
+    {
+        _logger.LogInformation("Update data: {json}",
+        JsonSerializer.Serialize(manufacturerDataModel));
+        ArgumentNullException.ThrowIfNull(manufacturerDataModel);
+        manufacturerDataModel.Validate();
+        _manufacturerStorageContract.UpdElement(manufacturerDataModel);
+    }
+    public void DeleteManufacturer(string id)
+    {
+        _logger.LogInformation("Delete by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _manufacturerStorageContract.DelElement(id);
+    }
+}

SmallSoftwareProject/SmallSoftwareBusinessLogic/Implementations/PostBusinessLogicContract.cs

@@ -0,0 +1,100 @@
+using Microsoft.Extensions.Logging;
+using SmallSoftwareContracts.BusinessLogicsContracts;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Enums;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.Extensions;
+using SmallSoftwareContracts.StoragesContracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareBusinessLogic.Implementations;
+
+internal class PostBusinessLogicContract(IPostStorageContract
+postStorageContract, ILogger logger) : IPostBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly IPostStorageContract _postStorageContract =
+    postStorageContract;
+    public List<PostDataModel> GetAllPosts()
+    {
+        _logger.LogInformation("GetAllPosts");
+        return _postStorageContract.GetList() ?? throw new NullListException();
+    }
+    public List<PostDataModel> GetAllDataOfPost(string postId)
+    {
+        _logger.LogInformation("GetAllDataOfPost for {postId}", postId);
+        if (postId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(postId));
+        }
+        if (!postId.IsGuid())
+        {
+            throw new ValidationException("The value in the field postId is not a unique identifier."); 
+        }
+        return _postStorageContract.GetPostWithHistory(postId) ?? throw new
+        NullListException();
+    }
+    public PostDataModel GetPostByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _postStorageContract.GetElementById(data) ?? throw new
+            ElementNotFoundException(data);
+        }
+        return _postStorageContract.GetElementByName(data) ?? throw new
+        ElementNotFoundException(data);
+    }
+    public void InsertPost(PostDataModel postDataModel)
+    {
+        _logger.LogInformation("New data: {json}",
+        JsonSerializer.Serialize(postDataModel));
+        ArgumentNullException.ThrowIfNull(postDataModel);
+        postDataModel.Validate();
+        _postStorageContract.AddElement(postDataModel);
+    }
+    public void UpdatePost(PostDataModel postDataModel)
+    {
+        _logger.LogInformation("Update data: {json}",
+        JsonSerializer.Serialize(postDataModel));
+        ArgumentNullException.ThrowIfNull(postDataModel);
+        postDataModel.Validate();
+        _postStorageContract.UpdElement(postDataModel);
+    }
+    public void DeletePost(string id)
+    {
+        _logger.LogInformation("Delete by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _postStorageContract.DelElement(id);
+    }
+    public void RestorePost(string id)
+    {
+        _logger.LogInformation("Restore by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        { 
+        throw new ValidationException("Id is not a unique identifier");
+        }
+        _postStorageContract.ResElement(id);
+    }
+}
+

SmallSoftwareProject/SmallSoftwareBusinessLogic/Implementations/RequestBusinessLogicContract.cs

@@ -0,0 +1,108 @@
+using Microsoft.Extensions.Logging;
+using SmallSoftwareContracts.BusinessLogicsContracts;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.Extensions;
+using SmallSoftwareContracts.StoragesContracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareBusinessLogic.Implementations;
+
+internal class RequestBusinessLogicContract(IRequestStorageContract requestStorageContract, ILogger logger) : IRequestBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly IRequestStorageContract _requestStorageContract =
+    requestStorageContract;
+    public List<RequestDataModel> GetAllRequestsByPeriod(DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllRequests params: {fromDate}, {toDate}", fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _requestStorageContract.GetList(fromDate, toDate) ?? throw new NullListException();
+
+    }
+    public List<RequestDataModel> GetAllRequestsByWorkerByPeriod(string workerId, DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllRequests params: {workerId}, {fromDate}, { toDate} ", workerId, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (workerId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(workerId));
+        }
+        if (!workerId.IsGuid())
+        {
+            throw new ValidationException("The value in the field workerId is not a unique identifier.");
+        }
+        return _requestStorageContract.GetList(fromDate, toDate, workerId:
+        workerId) ?? throw new NullListException();
+    }
+
+    public List<RequestDataModel> GetAllRequestsBySoftwareByPeriod(string softwareId, DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllRequests params: {softwareId}, {fromDate}, { toDate} ", softwareId, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (softwareId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(softwareId));
+        }
+        if (!softwareId.IsGuid())
+        {
+            throw new ValidationException("The value in the field  softwareId is not a unique identifier.");
+        }
+        return _requestStorageContract.GetList(fromDate, toDate, softwareId:
+        softwareId) ?? throw new NullListException();
+    }
+
+    public RequestDataModel GetRequestByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (!data.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        return _requestStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+
+    }
+    public void InsertRequest(RequestDataModel requestDataModel)
+    {
+        _logger.LogInformation("New data: {json}",
+    JsonSerializer.Serialize(requestDataModel));
+        ArgumentNullException.ThrowIfNull(requestDataModel);
+        requestDataModel.Validate();
+        _requestStorageContract.AddElement(requestDataModel);
+
+    }
+    public void CancelRequest(string id)
+    {
+        _logger.LogInformation("Cancel by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _requestStorageContract.DelElement(id);
+
+    }
+
+
+}

SmallSoftwareProject/SmallSoftwareBusinessLogic/Implementations/SalaryBusinessLogicContract.cs

@@ -0,0 +1,74 @@
+using Microsoft.Extensions.Logging;
+using SmallSoftwareContracts.BusinessLogicsContracts;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.Extensions;
+using SmallSoftwareContracts.StoragesContracts;
+namespace SmallSoftwareBusinessLogic.Implementations;
+
+
+internal class SalaryBusinessLogicContract(ISalaryStorageContract salaryStorageContract,
+    IRequestStorageContract requestStorageContract, IPostStorageContract postStorageContract, 
+    IWorkerStorageContract workerStorageContract, ILogger logger) : ISalaryBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly ISalaryStorageContract _salaryStorageContract =
+    salaryStorageContract;
+    private readonly IRequestStorageContract _requestStorageContract =
+    requestStorageContract;
+    private readonly IPostStorageContract _postStorageContract =
+    postStorageContract;
+    private readonly IWorkerStorageContract _workerStorageContract =
+    workerStorageContract;
+    public List<SalaryDataModel> GetAllSalariesByPeriod(DateTime fromDate,
+    DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSalaries params: {fromDate}, {toDate}",
+        fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _salaryStorageContract.GetList(fromDate, toDate) ?? throw new
+        NullListException();
+    }
+    public List<SalaryDataModel> GetAllSalariesByPeriodByWorker(DateTime
+    fromDate, DateTime toDate, string workerId)
+    {
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (workerId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(workerId));
+        }
+        if (!workerId.IsGuid())
+        {
+            throw new ValidationException("The value in the field workerId is not a unique identifier.");
+        }
+        _logger.LogInformation("GetAllSalaries params: {fromDate}, {toDate}, { workerId} ", fromDate, toDate, workerId);
+        return _salaryStorageContract.GetList(fromDate, toDate, workerId) ??
+        throw new NullListException();
+    }
+
+
+    public void CalculateSalaryByMonth(DateTime date)
+    {
+        _logger.LogInformation("CalculateSalaryByMounth: {date}", date);
+        var startDate = new DateTime(date.Year, date.Month, 1);
+        var finishDate = new DateTime(date.Year, date.Month, DateTime.DaysInMonth(date.Year, date.Month));
+        var workers = _workerStorageContract.GetList() ?? throw new NullListException();
+        foreach (var worker in workers)
+        {
+            var requests = _requestStorageContract.GetList(startDate, finishDate, workerId: worker.Id)?.Sum(x => x.Sum) ??
+                throw new NullListException();
+            var post = _postStorageContract.GetElementById(worker.PostId) ??
+                throw new NullListException();
+            var salary = post.Salary + requests * 0.1;
+            _logger.LogDebug("The employee {workerId} was paid a salary of {salary}", worker.Id, salary);
+            _salaryStorageContract.AddElement(new SalaryDataModel(worker.Id, finishDate, salary));
+        }
+    }
+}
+

SmallSoftwareProject/SmallSoftwareBusinessLogic/Implementations/SoftwareBusinessLogicContract.cs

@@ -0,0 +1,100 @@
+using Microsoft.Extensions.Logging;
+using SmallSoftwareContracts.BusinessLogicsContracts;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Enums;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.Extensions;
+using SmallSoftwareContracts.StoragesContracts;
+using System.Text.Json;
+
+namespace SmallSoftwareBusinessLogic.Implementations;
+
+internal class SoftwareBusinessLogicContract(ISoftwareStorageContract
+softwareStorageContract, ILogger logger) : ISoftwareBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly ISoftwareStorageContract _softwareStorageContract =
+    softwareStorageContract;
+    public List<SoftwareDataModel> GetAllSoftwares(bool onlyActive)
+    {
+    _logger.LogInformation("GetAllSoftwares params: {onlyActive}", onlyActive);
+    return _softwareStorageContract.GetList(onlyActive) ?? throw new
+    NullListException(); 
+    }
+    public List<SoftwareDataModel> GetAllSoftwaresByManufacturer(string
+    manufacturerId, bool onlyActive = true)
+    {
+    if (manufacturerId.IsEmpty())
+    {
+        throw new ArgumentNullException(nameof(manufacturerId));
+    }
+    if (!manufacturerId.IsGuid())
+    {
+        throw new ValidationException("The value in the field manufacturerId is not a unique identifier.");
+    }
+    _logger.LogInformation("GetAllSoftwares params: {manufacturerId}, { onlyActive} ", manufacturerId, onlyActive);
+    return _softwareStorageContract.GetList(onlyActive, manufacturerId) ??
+    throw new NullListException();
+    }
+    public List<SoftwareHistoryDataModel> GetSoftwareHistoryBySoftware(string softwareId)
+    {
+    _logger.LogInformation("GetSoftwareHistoryBySoftware for {softwareId}",  softwareId);
+        if (softwareId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(softwareId));
+        }
+        if (!softwareId.IsGuid())
+        {
+            throw new ValidationException("The value in the field softwareId is not a unique identifier."); 
+        }
+        return _softwareStorageContract.GetHistoryBySoftwareId(softwareId) ??
+        throw new NullListException();
+
+    }
+    public SoftwareDataModel GetSoftwareByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _softwareStorageContract.GetElementById(data) ?? throw
+            new ElementNotFoundException(data);
+        }
+        return _softwareStorageContract.GetElementByName(data) ?? throw new
+        ElementNotFoundException(data);
+    }
+    public void InsertSoftware(SoftwareDataModel softwareDataModel)
+    { 
+        _logger.LogInformation("New data: {json}",
+        JsonSerializer.Serialize(softwareDataModel));
+        ArgumentNullException.ThrowIfNull(softwareDataModel);
+        softwareDataModel.Validate();
+        _softwareStorageContract.AddElement(softwareDataModel); 
+    }
+    public void UpdateSoftware(SoftwareDataModel softwareDataModel)
+    {
+        _logger.LogInformation("Update data: {json}",
+        JsonSerializer.Serialize(softwareDataModel));
+        ArgumentNullException.ThrowIfNull(softwareDataModel);
+        softwareDataModel.Validate();
+        _softwareStorageContract.UpdElement(softwareDataModel);
+
+    }
+    public void DeleteSoftware(string id)
+    {
+        _logger.LogInformation("Delete by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _softwareStorageContract.DelElement(id);
+    }
+}
+

SmallSoftwareProject/SmallSoftwareBusinessLogic/Implementations/WorkerBusinessLogicContract.cs

@@ -0,0 +1,110 @@
+using Microsoft.Extensions.Logging;
+using SmallSoftwareContracts.BusinessLogicsContracts;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.Extensions;
+using SmallSoftwareContracts.StoragesContracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareBusinessLogic.Implementations;
+
+internal class WorkerBusinessLogicContract(IWorkerStorageContract
+workerStorageContract, ILogger logger) : IWorkerBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly IWorkerStorageContract _workerStorageContract =
+    workerStorageContract;
+    public List<WorkerDataModel> GetAllWorkers(bool onlyActive = true)
+    {
+        _logger.LogInformation("GetAllWorkers params: {onlyActive}",
+        onlyActive);
+        return _workerStorageContract.GetList(onlyActive) ?? throw new
+        NullListException();
+    }
+    public List<WorkerDataModel> GetAllWorkersByPost(string postId, bool
+    onlyActive = true)
+    {
+        _logger.LogInformation("GetAllWorkers params: {postId}, { onlyActive},", postId, onlyActive);
+    if (postId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(postId));
+        }
+        if (!postId.IsGuid())
+        {
+            throw new ValidationException("The value in the field postId is not a unique identifier.");
+        } 
+    return _workerStorageContract.GetList(onlyActive, postId) ?? throw
+    new NullListException();
+    }
+    public List<WorkerDataModel> GetAllWorkersByBirthDate(DateTime fromDate,
+    DateTime toDate, bool onlyActive = true)
+    {
+        _logger.LogInformation("GetAllWorkers params: {onlyActive},  { fromDate}, { toDate} ", onlyActive, fromDate, toDate);
+    if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _workerStorageContract.GetList(onlyActive, fromBirthDate:
+        fromDate, toBirthDate: toDate) ?? throw new NullListException();
+    }
+    public List<WorkerDataModel> GetAllWorkersByEmploymentDate(DateTime
+    fromDate, DateTime toDate, bool onlyActive = true)
+    {
+        _logger.LogInformation("GetAllWorkers params: {onlyActive}, { fromDate}, { toDate} ", onlyActive, fromDate, toDate);
+    if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _workerStorageContract.GetList(onlyActive, fromEmploymentDate:
+        fromDate, toEmploymentDate: toDate) ?? throw new NullListException();
+    }
+    public WorkerDataModel GetWorkerByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _workerStorageContract.GetElementById(data) ?? throw
+            new ElementNotFoundException(data);
+        }
+        return _workerStorageContract.GetElementByFIO(data) ?? throw new
+        ElementNotFoundException(data);
+    }
+    public void InsertWorker(WorkerDataModel workerDataModel)
+    {
+        _logger.LogInformation("New data: {json}",
+        JsonSerializer.Serialize(workerDataModel));
+        ArgumentNullException.ThrowIfNull(workerDataModel);
+        workerDataModel.Validate();
+        _workerStorageContract.AddElement(workerDataModel);
+    }
+    public void UpdateWorker(WorkerDataModel workerDataModel)
+    {
+        _logger.LogInformation("Update data: {json}",
+        JsonSerializer.Serialize(workerDataModel));
+        ArgumentNullException.ThrowIfNull(workerDataModel);
+        workerDataModel.Validate();
+        _workerStorageContract.UpdElement(workerDataModel);
+    } 
+public void DeleteWorker(string id)
+    {
+        _logger.LogInformation("Delete by id: {id}", id);
+        if (id.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(id));
+        }
+        if (!id.IsGuid())
+        {
+            throw new ValidationException("Id is not a unique identifier");
+        }
+        _workerStorageContract.DelElement(id);
+    }
+}

SmallSoftwareProject/SmallSoftwareBusinessLogic/SmallSoftwareBusinessLogic.csproj

@@ -0,0 +1,23 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="9.0.2" />
+  </ItemGroup>
+
+    <ItemGroup>
+	    <InternalsVisibleTo Include="SmallSoftwareTests" />
+		<InternalsVisibleTo Include="SmallSoftwareWebApi" />
+	    <InternalsVisibleTo Include="DynamicProxyGenAssembly2" />
+    </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\SmallSoftwareContracts\SmallSoftwareContracts.csproj" />
+  </ItemGroup>
+
+</Project>

SmallSoftwareProject/SmallSoftwareContracts/AdapterContracts/IManufacturerAdapter.cs

@@ -0,0 +1,18 @@
+using SmallSoftwareContracts.AdapterContracts.OperationResponses;
+using SmallSoftwareContracts.BindingModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.AdapterContracts;
+
+public interface IManufacturerAdapter
+{
+    ManufacturerOperationResponse GetList();
+    ManufacturerOperationResponse GetElement(string data);
+    ManufacturerOperationResponse RegisterManufacturer(ManufacturerBindingModel manufacturerModel);
+    ManufacturerOperationResponse ChangeManufacturerInfo(ManufacturerBindingModel manufacturerModel);
+    ManufacturerOperationResponse RemoveManufacturer(string id);
+}

SmallSoftwareProject/SmallSoftwareContracts/AdapterContracts/IPostAdapter.cs

@@ -0,0 +1,15 @@
+using SmallSoftwareContracts.AdapterContracts.OperationResponses;
+using SmallSoftwareContracts.BindingModels;
+
+namespace SmallSoftwareContracts.AdapterContracts;
+
+public interface IPostAdapter
+{
+    PostOperationResponse GetList();
+    PostOperationResponse GetHistory(string id); 
+    PostOperationResponse GetElement(string data);
+    PostOperationResponse RegisterPost(PostBindingModel postModel);
+    PostOperationResponse ChangePostInfo(PostBindingModel postModel);
+    PostOperationResponse RemovePost(string id);
+    PostOperationResponse RestorePost(string id);
+}

SmallSoftwareProject/SmallSoftwareContracts/AdapterContracts/IRequestAdapter.cs

@@ -0,0 +1,22 @@
+using SmallSoftwareContracts.AdapterContracts.OperationResponses;
+using SmallSoftwareContracts.BindingModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.AdapterContracts;
+
+public interface IRequestAdapter
+{
+
+    RequestOperationResponse GetList(DateTime fromDate, DateTime toDate);
+    RequestOperationResponse GetWorkerList(string id, DateTime fromDate, DateTime
+    toDate);
+    RequestOperationResponse GetSoftwareList(string id, DateTime fromDate, DateTime
+    toDate);
+    RequestOperationResponse GetElement(string id);
+    RequestOperationResponse MakeRequest(RequestBindingModel saleModel);
+    RequestOperationResponse CancelRequest(string id);
+}

SmallSoftwareProject/SmallSoftwareContracts/AdapterContracts/ISalaryAdapter.cs

@@ -0,0 +1,15 @@
+using SmallSoftwareContracts.AdapterContracts.OperationResponses;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.AdapterContracts;
+
+public interface ISalaryAdapter
+{
+    SalaryOperationResponse GetListByPeriod(DateTime fromDate, DateTime toDate);
+    SalaryOperationResponse GetListByPeriodByWorker(DateTime fromDate, DateTime toDate, string workerId);
+    SalaryOperationResponse CalculateSalary(DateTime date);
+}

SmallSoftwareProject/SmallSoftwareContracts/AdapterContracts/ISoftwareAdapter.cs

@@ -0,0 +1,18 @@
+using SmallSoftwareContracts.AdapterContracts.OperationResponses;
+using SmallSoftwareContracts.BindingModels;
+
+namespace SmallSoftwareContracts.AdapterContracts;
+
+public interface ISoftwareAdapter
+{
+    SoftwareOperationResponse GetList(bool includeDeleted); 
+    SoftwareOperationResponse GetManufacturerList(string id, bool
+    includeDeleted);
+    SoftwareOperationResponse GetHistory(string id);
+    SoftwareOperationResponse GetElement(string data);
+    SoftwareOperationResponse RegisterSoftware(SoftwareBindingModel productModel);
+    SoftwareOperationResponse ChangeSoftwareInfo(SoftwareBindingModel
+    productModel);
+    SoftwareOperationResponse RemoveSoftware(string id);
+
+}

SmallSoftwareProject/SmallSoftwareContracts/AdapterContracts/IWorkerAdapter.cs

@@ -0,0 +1,23 @@
+using SmallSoftwareContracts.AdapterContracts.OperationResponses;
+using SmallSoftwareContracts.BindingModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.AdapterContracts;
+
+public interface IWorkerAdapter
+{
+    WorkerOperationResponse GetList(bool includeDeleted); 
+    WorkerOperationResponse GetPostList(string id, bool includeDeleted);
+    WorkerOperationResponse GetListByBirthDate(DateTime fromDate, DateTime toDate, bool includeDeleted);
+    WorkerOperationResponse GetListByEmploymentDate(DateTime fromDate, DateTime
+    toDate, bool includeDeleted);
+    WorkerOperationResponse GetElement(string data);
+    WorkerOperationResponse RegisterWorker(WorkerBindingModel workerModel);
+    WorkerOperationResponse ChangeWorkerInfo(WorkerBindingModel workerModel);
+    WorkerOperationResponse RemoveWorker(string id);
+
+}

SmallSoftwareProject/SmallSoftwareContracts/AdapterContracts/OperationResponses/ManufacturerOperationResponse.cs

@@ -0,0 +1,25 @@
+using SmallSoftwareContracts.Infrastructure;
+using SmallSoftwareContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.AdapterContracts.OperationResponses;
+
+public class ManufacturerOperationResponse : OperationResponse
+{
+    public static ManufacturerOperationResponse OK(List<ManufacturerViewModel>
+    data) => OK<ManufacturerOperationResponse, List<ManufacturerViewModel>>(data);
+    public static ManufacturerOperationResponse OK(ManufacturerViewModel data)
+    => OK<ManufacturerOperationResponse, ManufacturerViewModel>(data);
+    public static ManufacturerOperationResponse NoContent() =>
+    NoContent<ManufacturerOperationResponse>();
+    public static ManufacturerOperationResponse NotFound(string message) =>
+    NotFound<ManufacturerOperationResponse>(message);
+    public static ManufacturerOperationResponse BadRequest(string message) =>
+    BadRequest<ManufacturerOperationResponse>(message);
+    public static ManufacturerOperationResponse InternalServerError(string
+    message) => InternalServerError<ManufacturerOperationResponse>(message);
+}

SmallSoftwareProject/SmallSoftwareContracts/AdapterContracts/OperationResponses/PostOperationResponse.cs

@@ -0,0 +1,20 @@
+using SmallSoftwareContracts.Infrastructure;
+using SmallSoftwareContracts.ViewModels;
+
+namespace SmallSoftwareContracts.AdapterContracts.OperationResponses;
+
+public class PostOperationResponse : OperationResponse
+{
+    public static PostOperationResponse OK(List<PostViewModel> data) =>
+    OK<PostOperationResponse, List<PostViewModel>>(data);
+    public static PostOperationResponse OK(PostViewModel data) =>
+    OK<PostOperationResponse, PostViewModel>(data);
+    public static PostOperationResponse NoContent() =>
+    NoContent<PostOperationResponse>();
+    public static PostOperationResponse NotFound(string message) =>
+    NotFound<PostOperationResponse>(message);
+    public static PostOperationResponse BadRequest(string message) =>
+    BadRequest<PostOperationResponse>(message);
+    public static PostOperationResponse InternalServerError(string message) =>
+    InternalServerError<PostOperationResponse>(message);
+}

SmallSoftwareProject/SmallSoftwareContracts/AdapterContracts/OperationResponses/RequestOperationResponse.cs

@@ -0,0 +1,19 @@
+using SmallSoftwareContracts.Infrastructure;
+using SmallSoftwareContracts.ViewModels;
+
+namespace SmallSoftwareContracts.AdapterContracts.OperationResponses;
+public class RequestOperationResponse : OperationResponse
+{
+    public static RequestOperationResponse OK(List<RequestViewModel> data) =>
+    OK<RequestOperationResponse, List<RequestViewModel>>(data); 
+    public static RequestOperationResponse OK(RequestViewModel data) =>
+    OK<RequestOperationResponse, RequestViewModel>(data);
+    public static RequestOperationResponse NoContent() =>
+    NoContent<RequestOperationResponse>();
+    public static RequestOperationResponse NotFound(string message) =>
+    NotFound<RequestOperationResponse>(message);
+    public static RequestOperationResponse BadRequest(string message) =>
+    BadRequest<RequestOperationResponse>(message);
+    public static RequestOperationResponse InternalServerError(string message) =>
+    InternalServerError<RequestOperationResponse>(message);
+}

SmallSoftwareProject/SmallSoftwareContracts/AdapterContracts/OperationResponses/SalaryOperationResponse.cs

@@ -0,0 +1,18 @@
+using SmallSoftwareContracts.Infrastructure;
+using SmallSoftwareContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.AdapterContracts.OperationResponses;
+
+public class SalaryOperationResponse : OperationResponse
+{
+    public static SalaryOperationResponse OK(List<SalaryViewModel> data) => OK<SalaryOperationResponse, List<SalaryViewModel>>(data);
+    public static SalaryOperationResponse NoContent() => NoContent<SalaryOperationResponse>();
+    public static SalaryOperationResponse NotFound(string message) => NotFound<SalaryOperationResponse>(message);
+    public static SalaryOperationResponse BadRequest(string message) => BadRequest<SalaryOperationResponse>(message);
+    public static SalaryOperationResponse InternalServerError(string message) => InternalServerError<SalaryOperationResponse>(message);
+}

SmallSoftwareProject/SmallSoftwareContracts/AdapterContracts/OperationResponses/SoftwareOperationResponse.cs

@@ -0,0 +1,22 @@
+using SmallSoftwareContracts.Infrastructure;
+using SmallSoftwareContracts.ViewModels;
+
+namespace SmallSoftwareContracts.AdapterContracts.OperationResponses;
+
+public class SoftwareOperationResponse : OperationResponse
+{
+    public static SoftwareOperationResponse OK(List<SoftwareViewModel> data) =>
+    OK<SoftwareOperationResponse, List<SoftwareViewModel>>(data);
+    public static SoftwareOperationResponse OK(List<SoftwareHistoryViewModel>
+    data) => OK<SoftwareOperationResponse, List<SoftwareHistoryViewModel>>(data);
+    public static SoftwareOperationResponse OK(SoftwareViewModel data) =>
+    OK<SoftwareOperationResponse, SoftwareViewModel>(data);
+    public static SoftwareOperationResponse NoContent() =>
+    NoContent<SoftwareOperationResponse>();
+    public static SoftwareOperationResponse NotFound(string message) =>
+    NotFound<SoftwareOperationResponse>(message);
+    public static SoftwareOperationResponse BadRequest(string message) =>
+    BadRequest<SoftwareOperationResponse>(message);
+    public static SoftwareOperationResponse InternalServerError(string message)
+    => InternalServerError<SoftwareOperationResponse>(message);
+}

SmallSoftwareProject/SmallSoftwareContracts/AdapterContracts/OperationResponses/WorkerOperationResponse.cs

@@ -0,0 +1,24 @@
+using SmallSoftwareContracts.Infrastructure;
+using SmallSoftwareContracts.ViewModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.AdapterContracts.OperationResponses;
+public class WorkerOperationResponse : OperationResponse
+{
+    public static WorkerOperationResponse OK(List<WorkerViewModel> data) =>
+    OK<WorkerOperationResponse, List<WorkerViewModel>>(data);
+    public static WorkerOperationResponse OK(WorkerViewModel data) =>
+    OK<WorkerOperationResponse, WorkerViewModel>(data);
+    public static WorkerOperationResponse NoContent() =>
+    NoContent<WorkerOperationResponse>();
+    public static WorkerOperationResponse NotFound(string message) =>
+    NotFound<WorkerOperationResponse>(message);
+    public static WorkerOperationResponse BadRequest(string message) =>
+    BadRequest<WorkerOperationResponse>(message);
+    public static WorkerOperationResponse InternalServerError(string message)
+    => InternalServerError<WorkerOperationResponse>(message);
+}

SmallSoftwareProject/SmallSoftwareContracts/BindingModels/InstallationRequestBindingModel.cs

@@ -0,0 +1,12 @@
+namespace SmallSoftwareContracts.BindingModels;
+
+public class InstallationRequestBindingModel
+
+{
+
+    public string? SoftwareId { get; set; }
+    public string? RequestId { get; set; }
+    public int Count { get; set; } 
+    public double Price { get; set; }
+
+}

SmallSoftwareProject/SmallSoftwareContracts/BindingModels/ManufacturerBindingModel.cs

@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.BindingModels;
+
+public class ManufacturerBindingModel
+{
+    public string? Id { get; set; }
+    public string? ManufacturerName { get; set; }
+}

SmallSoftwareProject/SmallSoftwareContracts/BindingModels/PostBindingModel.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.BindingModels;
+
+public class PostBindingModel
+{
+    public string? Id { get; set; } 
+    public string? PostId => Id;
+    public string? PostName { get; set; }
+    public string? PostType { get; set; }
+    public double Salary { get; set; }
+}

SmallSoftwareProject/SmallSoftwareContracts/BindingModels/RequestBindingModel.cs

@@ -0,0 +1,10 @@
+using SmallSoftwareContracts.DataModels;
+
+namespace SmallSoftwareContracts.BindingModels;
+
+public class RequestBindingModel
+{
+    public string? Id { get; set; }
+    public string? WorkerId { get; set; } 
+    public List<InstallationRequestBindingModel>? Softwares { get; set; }
+}

SmallSoftwareProject/SmallSoftwareContracts/BindingModels/SoftwareBindingModel.cs

@@ -0,0 +1,12 @@
+using SmallSoftwareContracts.Enums;
+
+namespace SmallSoftwareContracts.BindingModels;
+
+public class SoftwareBindingModel
+{
+    public string? Id { get; set; }
+    public string? SoftwareName { get;  set; }
+    public string? SoftwareType { get; set; }
+    public string? ManufacturerId { get; set; }
+    public double Price { get; set; }
+}

SmallSoftwareProject/SmallSoftwareContracts/BindingModels/WorkerBindingModel.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.BindingModels;
+public class WorkerBindingModel
+{
+    public string? Id { get; set; }
+    public string? FIO { get; set; }
+    public string? PostId { get; set; }
+    public DateTime BirthDate { get; set; }
+    public DateTime EmploymentDate { get; set; }
+}

SmallSoftwareProject/SmallSoftwareContracts/BusinessLogicsContracts/IManufacturerBusinessLogicContract.cs

@@ -0,0 +1,17 @@
+using SmallSoftwareContracts.DataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.BusinessLogicsContracts;
+
+public interface IManufacturerBusinessLogicContract
+{
+    List<ManufacturerDataModel> GetAllManufacturers();
+    ManufacturerDataModel GetManufacturerByData(string data);
+    void InsertManufacturer(ManufacturerDataModel manufacturerDataModel);
+    void UpdateManufacturer(ManufacturerDataModel manufacturerDataModel); 
+    void DeleteManufacturer(string id);
+}

SmallSoftwareProject/SmallSoftwareContracts/BusinessLogicsContracts/IPostBusinessLogicContract.cs

@@ -0,0 +1,19 @@
+using SmallSoftwareContracts.DataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.BusinessLogicsContracts;
+
+public interface IPostBusinessLogicContract
+{
+    List<PostDataModel> GetAllPosts();
+    List<PostDataModel> GetAllDataOfPost(string postId);
+    PostDataModel GetPostByData(string data);
+    void InsertPost(PostDataModel postDataModel);
+    void UpdatePost(PostDataModel postDataModel);
+    void DeletePost(string id);
+    void RestorePost(string id);
+}

SmallSoftwareProject/SmallSoftwareContracts/BusinessLogicsContracts/IRequestBusinessLogicContract.cs

@@ -0,0 +1,19 @@
+using SmallSoftwareContracts.DataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.BusinessLogicsContracts;
+
+public interface IRequestBusinessLogicContract
+{
+
+    List<RequestDataModel> GetAllRequestsByPeriod(DateTime fromDate, DateTime toDate);
+    List<RequestDataModel> GetAllRequestsByWorkerByPeriod(string workerId, DateTime fromDate, DateTime toDate);
+    List<RequestDataModel> GetAllRequestsBySoftwareByPeriod(string softwareId, DateTime fromDate, DateTime toDate);
+    RequestDataModel GetRequestByData(string data);
+    void InsertRequest(RequestDataModel requestDataModel);
+    void CancelRequest(string id);
+}

SmallSoftwareProject/SmallSoftwareContracts/BusinessLogicsContracts/ISalaryBusinessLogicContract.cs

@@ -0,0 +1,12 @@
+
+using SmallSoftwareContracts.DataModels;
+
+namespace SmallSoftwareContracts.BusinessLogicsContracts;
+
+public interface ISalaryBusinessLogicContract
+{
+    List<SalaryDataModel> GetAllSalariesByPeriod(DateTime fromDate, DateTime toDate); 
+    List<SalaryDataModel> GetAllSalariesByPeriodByWorker(DateTime fromDate, DateTime toDate, string workerId);
+    void CalculateSalaryByMonth(DateTime date);
+
+}

SmallSoftwareProject/SmallSoftwareContracts/BusinessLogicsContracts/ISoftwareBusinessLogicContract.cs

@@ -0,0 +1,16 @@
+using SmallSoftwareContracts.DataModels;
+
+namespace SmallSoftwareContracts.BusinessLogicsContracts;
+
+public interface ISoftwareBusinessLogicContract
+{
+    List<SoftwareDataModel> GetAllSoftwares(bool onlyActive = true);
+    List<SoftwareDataModel> GetAllSoftwaresByManufacturer(string manufacturerId,
+    bool onlyActive = true);
+    List<SoftwareHistoryDataModel> GetSoftwareHistoryBySoftware(string softwareId);
+    SoftwareDataModel GetSoftwareByData(string data);
+    void InsertSoftware(SoftwareDataModel softwareDataModel);
+    void UpdateSoftware(SoftwareDataModel softwareDataModel);
+    void DeleteSoftware(string id);
+
+}

SmallSoftwareProject/SmallSoftwareContracts/BusinessLogicsContracts/IWorkerBusinessLogicContract.cs

@@ -0,0 +1,17 @@
+using SmallSoftwareContracts.DataModels;
+
+namespace SmallSoftwareContracts.BusinessLogicsContracts;
+
+public interface IWorkerBusinessLogicContract
+{
+    List<WorkerDataModel> GetAllWorkers(bool onlyActive = true);
+    List<WorkerDataModel> GetAllWorkersByPost(string postId, bool onlyActive = true);
+    List<WorkerDataModel> GetAllWorkersByBirthDate(DateTime fromDate, DateTime toDate, bool onlyActive = true);
+    List<WorkerDataModel> GetAllWorkersByEmploymentDate(DateTime fromDate,
+    DateTime toDate, bool onlyActive = true);
+    WorkerDataModel GetWorkerByData(string data);
+    void InsertWorker(WorkerDataModel workerDataModel);
+    void UpdateWorker(WorkerDataModel workerDataModel);
+    void DeleteWorker(string id);
+
+}

SmallSoftwareProject/SmallSoftwareContracts/DataModels/InstallationRequestDataModel.cs

@@ -0,0 +1,38 @@
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.Extensions;
+using SmallSoftwareContracts.Infrastructure;
+
+namespace SmallSoftwareContracts.DataModels;
+
+public class InstallationRequestDataModel(string softwareId, string requestId, int count, double price) : IValidation
+{
+    private readonly SoftwareDataModel? _software;
+
+    public string SoftwareId { get; private set; } = softwareId;
+    public string RequestId { get; private set; } = requestId;
+    public int Count { get; private set; } = count; 
+    public double Price { get; private set; } = price;
+
+    public string SoftwareName => _software?.SoftwareName ?? string.Empty;
+    public InstallationRequestDataModel(string saleId, string softwareId, int count, double price, SoftwareDataModel software) : this(saleId, softwareId, count, price)
+    {
+        _software = software;
+    }
+
+
+    public void Validate()
+    {
+        if (SoftwareId.IsEmpty())
+            throw new ValidationException("Field SoftwareId is empty");
+        if (!SoftwareId.IsGuid())
+            throw new ValidationException("The value in the field SoftwareId is not a unique identifier");
+        if (RequestId.IsEmpty())
+            throw new ValidationException("Field RequestId is empty");
+        if (!RequestId.IsGuid())
+            throw new ValidationException("The value in the field RequestId is not a unique identifier");
+        if (Count <= 0)
+            throw new ValidationException("Field Count is less than or equal to 0");
+        if (Price <= 0)
+            throw new ValidationException("Field Price is less than or equal to 0");
+    }
+}

SmallSoftwareProject/SmallSoftwareContracts/DataModels/ManufacturerDataModel.cs

@@ -0,0 +1,30 @@
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.Extensions;
+using SmallSoftwareContracts.Infrastructure;
+
+namespace SmallSoftwareContracts.DataModels;
+
+public class ManufacturerDataModel(string id, string manufacturerName, string?
+prevManufacturerName, string? prevPrevManufacturerName) : IValidation
+{
+    public string Id { get; private set; } = id;
+    public string ManufacturerName { get; private set; } = manufacturerName;
+    public string? PrevManufacturerName { get; private set; } =
+    prevManufacturerName;
+    public string? PrevPrevManufacturerName { get; private set; } =
+    prevPrevManufacturerName;
+
+    public ManufacturerDataModel(string id, string manufacturerName) : this(id, manufacturerName, null, null){ }
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+
+        if (ManufacturerName.IsEmpty())
+            throw new ValidationException("Field ManufacturerName is empty");
+    }
+}

SmallSoftwareProject/SmallSoftwareContracts/DataModels/PostDataModel.cs

@@ -0,0 +1,28 @@
+using SmallSoftwareContracts.Enums;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.Extensions;
+using SmallSoftwareContracts.Infrastructure;
+
+namespace SmallSoftwareContracts.DataModels;
+
+public class PostDataModel(string postId, string postName, PostType
+postType, double salary) : IValidation
+{
+    public string Id { get; private set; } = postId;
+    public string PostName { get; private set; } = postName;
+    public PostType PostType { get; private set; } = postType;
+    public double Salary { get; private set; } = salary;
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+        if (PostName.IsEmpty())
+            throw new ValidationException("Field PostName is empty");
+        if (PostType == PostType.None)
+            throw new ValidationException("Field PostType is empty");
+        if (Salary <= 0)
+            throw new ValidationException("Field Salary is empty");
+    }
+}

SmallSoftwareProject/SmallSoftwareContracts/DataModels/RequestDataModel.cs

@@ -0,0 +1,60 @@
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.Extensions;
+using SmallSoftwareContracts.Infrastructure;
+using System.Text.RegularExpressions;
+using System.Xml;
+
+
+namespace SmallSoftwareContracts.DataModels;
+
+
+public class RequestDataModel : IValidation
+{
+    private readonly WorkerDataModel? _worker;
+    public string Id { get; private set; }
+    public string WorkerId { get; private set; }
+    public DateTime RequestDate { get; private set; } = DateTime.UtcNow;
+    public string Email { get; private set; }
+    public double Sum { get; private set; }
+    public bool IsCancel { get; private set; }
+    public List<InstallationRequestDataModel>? Softwares { get; private set; }
+    public string WorkerFIO => _worker?.FIO ?? string.Empty;
+    public RequestDataModel(string id, string workerId, string email, bool isCancel, List<InstallationRequestDataModel> installationRequests, DateTime requestDate)
+    {
+        Id = id;
+        WorkerId = workerId;
+        Email = email;
+        IsCancel = isCancel;
+        Softwares = installationRequests;
+        Sum = Softwares?.Sum(x => x.Price * x.Count) ?? 0;
+    }
+
+    public RequestDataModel(string id, string workerId, string email, double sum, bool isCancel,
+    List<InstallationRequestDataModel> installationRequests, WorkerDataModel worker, DateTime requestDate)
+    : this(id, workerId, email, isCancel, installationRequests, requestDate)
+    {
+        Sum = sum;
+        _worker = worker;
+    }
+
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+        if (WorkerId.IsEmpty())
+            throw new ValidationException("Field WorkerId is empty");
+        if (!WorkerId.IsGuid())
+            throw new ValidationException("The value in the field WorkerId is not a unique identifier");
+        if (Sum <= 0)
+            throw new ValidationException("Field Sum is less than or equal to 0");
+        if ((Softwares?.Count ?? 0) == 0)
+            throw new ValidationException("The request must include products");
+        if (!Regex.IsMatch(Email, @"^[^@\s]+@[^@\s]+\.[^@\s]+$"))
+        {
+            throw new ValidationException("Invalid email format");
+        }
+    }
+}

SmallSoftwareProject/SmallSoftwareContracts/DataModels/SalaryDataModel.cs

@@ -0,0 +1,31 @@
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.Extensions;
+using SmallSoftwareContracts.Infrastructure;
+
+namespace SmallSoftwareContracts.DataModels;
+
+public class SalaryDataModel(string workerId, DateTime salaryDate, double
+workerSalary) : IValidation
+{
+    private readonly WorkerDataModel? _worker;
+    public string WorkerId { get; private set; } = workerId;
+    public DateTime SalaryDate { get; private set; } = salaryDate;
+    public double Salary { get; private set; } = workerSalary;
+    public string WorkerFIO => _worker?.FIO ?? string.Empty;
+
+    public SalaryDataModel(string workerId, DateTime salaryDate, double workerSalary, WorkerDataModel worker) : this(workerId, salaryDate, workerSalary)
+    {
+        _worker = worker;
+    }
+
+    public void Validate()
+    {
+        if (WorkerId.IsEmpty())
+            throw new ValidationException("Field WorkerId is empty");
+        if (!WorkerId.IsGuid())
+            throw new ValidationException("The value in the field WorkerId is not a unique identifier");
+        if (Salary <= 0)
+            throw new ValidationException("Field Salary is less than or equal to 0");
+    }
+}
+

SmallSoftwareProject/SmallSoftwareContracts/DataModels/SoftwareDataModel.cs

@@ -0,0 +1,55 @@
+using SmallSoftwareContracts.Enums;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.Extensions;
+using SmallSoftwareContracts.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml;
+
+namespace SmallSoftwareContracts.DataModels;
+
+public class SoftwareDataModel(string id, string softwareName, SoftwareType softwareType, string manufacturerId, double price, bool isDeleted) : IValidation
+{
+    private readonly ManufacturerDataModel? _manufacturer;
+    public string Id { get; private set; } = id;
+    public string SoftwareName { get; private set; } = softwareName;
+    public SoftwareType SoftwareType { get; private set; } = softwareType;
+    public string ManufacturerId { get; private set; } = manufacturerId;
+    public double Price { get; private set; } = price;
+    public bool IsDeleted { get; private set; } = isDeleted;
+    public string ManufacturerName => _manufacturer?.ManufacturerName ?? string.Empty;
+
+    public SoftwareDataModel(string id, string softwareName, SoftwareType
+    softwareType, string manufacturerId, double price, bool isDeleted,
+    ManufacturerDataModel manufacturer) : this(id, softwareName, softwareType,
+    manufacturerId, price, isDeleted)
+    {
+        _manufacturer = manufacturer;
+    }
+    public SoftwareDataModel(string id, string softwareName, SoftwareType
+    softwareType, string manufacturerId, double price) : this(id, softwareName,
+    softwareType, manufacturerId, price, false)
+    { }
+
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+        if (SoftwareName.IsEmpty())
+            throw new ValidationException("Field SoftwareName is empty");
+        if (SoftwareType == SoftwareType.None)
+            throw new ValidationException("Field SoftwareType is empty"); 
+        if (ManufacturerId.IsEmpty())
+            throw new ValidationException("Field ManufacturerId is empty");
+        if (!ManufacturerId.IsGuid())
+            throw new ValidationException("The value in the field ManufacturerId is not a unique identifier");
+        if (Price <= 0)
+            throw new ValidationException("Field Price is less than or  equal to 0");
+    }
+}

SmallSoftwareProject/SmallSoftwareContracts/DataModels/SoftwareHistoryDataModel.cs

@@ -0,0 +1,37 @@
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.Extensions;
+using SmallSoftwareContracts.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.DataModels;
+
+public class SoftwareHistoryDataModel(string softwareId, double oldPrice) : IValidation
+{
+    private readonly SoftwareDataModel? _software;
+    public string SoftwareId { get; private set; } = softwareId;
+    public double OldPrice { get; private set; } = oldPrice;
+    public DateTime ChangeDate { get; private set; } = DateTime.UtcNow;
+
+    public string SoftwareName => _software?.SoftwareName ?? string.Empty;
+    public SoftwareHistoryDataModel(string softwareId, double oldPrice, DateTime
+    changeDate, SoftwareDataModel software) : this(softwareId, oldPrice) 
+    {
+    ChangeDate = changeDate;
+    _software = software;
+    }
+
+    public void Validate()
+    {
+        if (SoftwareId.IsEmpty())
+            throw new ValidationException("Field SoftwareId is empty");
+        if (!SoftwareId.IsGuid())
+            throw new ValidationException("The value in the field SoftwareId is not a unique identifier");
+        if (OldPrice <= 0)
+            throw new ValidationException("Field OldPrice is less than or equal to 0");
+    }
+}
+

SmallSoftwareProject/SmallSoftwareContracts/DataModels/WorkerDataModel.cs

@@ -0,0 +1,50 @@
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.Extensions;
+using SmallSoftwareContracts.Infrastructure;
+
+namespace SmallSoftwareContracts.DataModels;
+
+public class WorkerDataModel(string id, string fio, string postId, DateTime
+birthDate, DateTime employmentDate, bool isDeleted) : IValidation
+{
+    private readonly PostDataModel? _post;
+    public string Id { get; private set; } = id;
+    public string FIO { get; private set; } = fio;
+    public string PostId { get; private set; } = postId;
+    public DateTime BirthDate { get; private set; } = birthDate;
+    public DateTime EmploymentDate { get; private set; } = employmentDate;
+    public bool IsDeleted { get; private set; } = isDeleted;
+    public string PostName => _post?.PostName ?? string.Empty;
+
+    public WorkerDataModel(string id, string fio, string postId, 
+        DateTime birthDate, DateTime employmentDate, bool isDeleted, PostDataModel post) : 
+        this(id, fio, postId, birthDate, employmentDate, isDeleted)
+    {
+    _post = post;
+    }
+    public WorkerDataModel(string id, string fio, string postId, 
+        DateTime birthDate, DateTime employmentDate) : this(id, fio, postId, birthDate, employmentDate, false)
+    { }
+
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+        if (FIO.IsEmpty())
+            throw new ValidationException("Field FIO is empty");
+        if (PostId.IsEmpty())
+            throw new ValidationException("Field PostId is empty");
+        if (!PostId.IsGuid())
+            throw new ValidationException("The value in the field PostId is not a unique identifier");
+        if (BirthDate.Date > DateTime.Now.AddYears(-16).Date)
+            throw new ValidationException($"Minors cannot be hired (BirthDate = { BirthDate.ToShortDateString() })");
+        if (EmploymentDate.Date < BirthDate.Date)
+            throw new ValidationException("The date of employment cannot be less than the date of birth");
+        if ((EmploymentDate - BirthDate).TotalDays / 365 < 16) 
+            throw new ValidationException($"Minors cannot be hired (EmploymentDate - { EmploymentDate.ToShortDateString() }, BirthDate - { BirthDate.ToShortDateString()})");
+    
+    }
+}

SmallSoftwareProject/SmallSoftwareContracts/Enums/PostType.cs

@@ -0,0 +1,10 @@
+namespace SmallSoftwareContracts.Enums;
+
+public enum PostType
+{
+    None = 0,
+    Supervisor = 1,
+    CashierConsultant = 2,
+    SoftInstaller = 3
+}
+

SmallSoftwareProject/SmallSoftwareContracts/Enums/SoftwareType.cs

@@ -0,0 +1,11 @@
+namespace SmallSoftwareContracts.Enums;
+
+public enum SoftwareType
+{
+    None = 0,
+    Windows = 1,
+    Linux = 2,
+    MacOS = 3,
+    AudioDriver = 4,
+    GPUDriver = 5
+}

SmallSoftwareProject/SmallSoftwareContracts/Exceptions/ElementDeletedException.cs

@@ -0,0 +1,5 @@
+namespace SmallSoftwareContracts.Exceptions;
+public class ElementDeletedException : Exception
+{
+    public ElementDeletedException(string id) : base($"Cannot modify a deleted item(id: { id})") { }
+}

SmallSoftwareProject/SmallSoftwareContracts/Exceptions/ElementExistsException.cs

@@ -0,0 +1,13 @@
+
+namespace SmallSoftwareContracts.Exceptions;
+public class ElementExistsException : Exception
+{
+    public string ParamName { get; private set; }
+    public string ParamValue { get; private set; }
+    public ElementExistsException(string paramName, string paramValue) :
+    base($"There is already an element with value{paramValue} of parameter { paramName}")
+    {
+        ParamName = paramName;
+        ParamValue = paramValue;
+    }
+}

SmallSoftwareProject/SmallSoftwareContracts/Exceptions/ElementNotFoundException.cs

@@ -0,0 +1,10 @@
+namespace SmallSoftwareContracts.Exceptions;
+
+public class ElementNotFoundException : Exception
+{
+    public string Value { get; private set; }
+    public ElementNotFoundException(string value) : base($"Element not found at value = { value}")
+    {
+        Value = value;
+    }
+}

SmallSoftwareProject/SmallSoftwareContracts/Exceptions/IncorrectDatesException.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using static System.Runtime.InteropServices.JavaScript.JSType;
+
+namespace SmallSoftwareContracts.Exceptions;
+
+public class IncorrectDatesException : Exception
+{ 
+public IncorrectDatesException(DateTime start, DateTime end) : 
+        base($"The end date must be later than the start date..StartDate: { start: dd.MM.YYYY}.EndDate: {end:dd.MM.YYYY}") { }
+}

SmallSoftwareProject/SmallSoftwareContracts/Exceptions/NullListException.cs

@@ -0,0 +1,7 @@
+
+namespace SmallSoftwareContracts.Exceptions;
+
+public class NullListException : Exception
+{
+    public NullListException() : base("The returned list is null") { }
+}

SmallSoftwareProject/SmallSoftwareContracts/Exceptions/StorageException.cs

@@ -0,0 +1,8 @@
+
+
+namespace SmallSoftwareContracts.Exceptions;
+
+public class StorageException : Exception
+{
+    public StorageException(Exception ex) : base($"Error while working in storage: { ex.Message}", ex) { }
+}

SmallSoftwareProject/SmallSoftwareContracts/Exceptions/ValidationException.cs

@@ -0,0 +1,5 @@
+namespace SmallSoftwareContracts.Exceptions;
+
+public class ValidationException(string message) : Exception(message)
+{
+}

SmallSoftwareProject/SmallSoftwareContracts/Extensions/DateTimeExtensions.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.Extensions;
+
+public static class DateTimeExtensions
+{
+    public static bool IsDateNotOlder(this DateTime date, DateTime olderDate)
+    {
+        return date >= olderDate;
+    }
+}
+

SmallSoftwareProject/SmallSoftwareContracts/Extensions/StringExtensions.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.Extensions;
+
+public static class StringExtensions
+{
+    public static bool IsEmpty(this string str)
+    {
+        return string.IsNullOrWhiteSpace(str);
+    }
+
+    public static bool IsGuid(this string str)
+    {
+    return Guid.TryParse(str, out _);
+    }
+}

SmallSoftwareProject/SmallSoftwareContracts/Infrastructure/IConfigurationDatabase.cs

@@ -0,0 +1,6 @@
+namespace SmallSoftwareContracts.Infrastructure;
+
+public interface IConfigurationDatabase
+{
+    string ConnectionString { get; } 
+}

SmallSoftwareProject/SmallSoftwareContracts/Infrastructure/IValidation.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.Infrastructure;
+
+public interface IValidation
+{
+    void Validate();
+}

SmallSoftwareProject/SmallSoftwareContracts/Infrastructure/OperationResponse.cs

@@ -0,0 +1,48 @@
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Mvc;
+using System.Net;
+
+namespace SmallSoftwareContracts.Infrastructure;
+
+public class OperationResponse
+{
+    protected HttpStatusCode StatusCode { get; set; } 
+    protected object? Result { get; set; }
+    public IActionResult GetResponse(HttpRequest request, HttpResponse
+    response)
+    {
+        ArgumentNullException.ThrowIfNull(request);
+        ArgumentNullException.ThrowIfNull(response);
+        response.StatusCode = (int)StatusCode;
+        if (Result is null)
+        {
+            return new StatusCodeResult((int)StatusCode);
+        }
+        return new ObjectResult(Result);
+    }
+    protected static TResult OK<TResult, TData>(TData data) where TResult :
+        OperationResponse, new() => new()
+    {
+        StatusCode = HttpStatusCode.OK,
+        Result = data
+    };
+    protected static TResult NoContent<TResult>() where TResult : 
+        OperationResponse, new() => new() { StatusCode = HttpStatusCode.NoContent };
+    protected static TResult BadRequest<TResult>(string? errorMessage = null)
+        where TResult : OperationResponse, new() => new()
+    {
+        StatusCode = HttpStatusCode.BadRequest,
+        Result = errorMessage
+    };
+    protected static TResult NotFound<TResult>(string? errorMessage = null) 
+        where TResult : OperationResponse, new() => new()
+    {
+        StatusCode = HttpStatusCode.NotFound,
+        Result = errorMessage
+    };
+    protected static TResult InternalServerError<TResult>(string? errorMessage = null) where TResult : OperationResponse, new() => new()
+    {
+        StatusCode = HttpStatusCode.InternalServerError,
+        Result = errorMessage
+    };
+}

SmallSoftwareProject/SmallSoftwareContracts/SmallSoftwareContracts.csproj

@@ -6,4 +6,9 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Abstractions" Version="2.3.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="2.3.0" />
+  </ItemGroup>
+
 </Project>

SmallSoftwareProject/SmallSoftwareContracts/StoragesContracts/IManufacturerStorageContract.cs

@@ -0,0 +1,15 @@
+using SmallSoftwareContracts.DataModels;
+
+namespace SmallSoftwareContracts.StoragesContracts;
+
+public interface IManufacturerStorageContract
+{
+    List<ManufacturerDataModel> GetList();
+    ManufacturerDataModel? GetElementById(string id);
+    ManufacturerDataModel? GetElementByName(string name);
+    ManufacturerDataModel? GetElementByOldName(string name);
+    void AddElement(ManufacturerDataModel manufacturerDataModel);
+    void UpdElement(ManufacturerDataModel manufacturerDataModel);
+    void DelElement(string id);
+
+}

SmallSoftwareProject/SmallSoftwareContracts/StoragesContracts/IPostStorageContract.cs

@@ -0,0 +1,15 @@
+using SmallSoftwareContracts.DataModels;
+
+namespace SmallSoftwareContracts.StoragesContracts;
+
+public interface IPostStorageContract
+{
+    List<PostDataModel> GetList();
+    List<PostDataModel> GetPostWithHistory(string postId);
+    PostDataModel? GetElementById(string id);
+    PostDataModel? GetElementByName(string name);
+    void AddElement(PostDataModel postDataModel);
+    void UpdElement(PostDataModel postDataModel);
+    void DelElement(string id);
+    void ResElement(string id);
+}

SmallSoftwareProject/SmallSoftwareContracts/StoragesContracts/IRequestStorageContract.cs

@@ -0,0 +1,12 @@
+using SmallSoftwareContracts.DataModels;
+
+namespace SmallSoftwareContracts.StoragesContracts;
+
+public interface IRequestStorageContract
+{
+    List<RequestDataModel> GetList(DateTime? startDate = null, 
+                                DateTime? endDate = null, string? workerId = null, string? softwareId = null);
+    RequestDataModel? GetElementById(string id);
+    void AddElement(RequestDataModel requestDataModel);
+    void DelElement(string id);
+}

SmallSoftwareProject/SmallSoftwareContracts/StoragesContracts/ISalaryStorageContract.cs

@@ -0,0 +1,10 @@
+using SmallSoftwareContracts.DataModels;
+
+namespace SmallSoftwareContracts.StoragesContracts;
+
+public interface ISalaryStorageContract
+{
+    List<SalaryDataModel> GetList(DateTime startDate, DateTime endDate, string? workerId = null);
+    void AddElement(SalaryDataModel salaryDataModel);
+
+}

SmallSoftwareProject/SmallSoftwareContracts/StoragesContracts/ISoftwareStorageContract.cs

@@ -0,0 +1,19 @@
+using SmallSoftwareContracts.DataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.StoragesContracts;
+
+public interface ISoftwareStorageContract
+{
+    List<SoftwareDataModel> GetList(bool onlyActive = true, string? manufacturerId = null);
+    List<SoftwareHistoryDataModel> GetHistoryBySoftwareId(string softwareId);
+    SoftwareDataModel? GetElementById(string id);
+    SoftwareDataModel? GetElementByName(string name);
+    void AddElement(SoftwareDataModel softwareDataModel);
+    void UpdElement(SoftwareDataModel softwareDataModel);
+    void DelElement(string id);
+}

SmallSoftwareProject/SmallSoftwareContracts/StoragesContracts/IWorkerStorageContract.cs

@@ -0,0 +1,20 @@
+using SmallSoftwareContracts.DataModels;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.StoragesContracts;
+
+public interface IWorkerStorageContract
+{
+    List<WorkerDataModel> GetList(bool onlyActive = true, string? postId =  
+                                  null, DateTime? fromBirthDate = null, DateTime? toBirthDate = null, DateTime?
+                                  fromEmploymentDate = null, DateTime? toEmploymentDate = null);
+    WorkerDataModel? GetElementById(string id);
+    WorkerDataModel? GetElementByFIO(string fio);
+    void AddElement(WorkerDataModel workerDataModel);
+    void UpdElement(WorkerDataModel workerDataModel);
+    void DelElement(string id);
+}

SmallSoftwareProject/SmallSoftwareContracts/ViewModels/InstallationRequestViewModel.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.ViewModels;
+
+public class InstallationRequestViewModel
+{
+    public required string SoftwareId { get; set; }
+    public required string SoftwareName { get; set; }
+    public int Count { get; set; }
+    public double Price { get; set; }
+}

SmallSoftwareProject/SmallSoftwareContracts/ViewModels/ManufacturerViewModel.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.ViewModels;
+
+public class ManufacturerViewModel
+{
+    public required string Id { get; set; }
+    public required string ManufacturerName { get; set; }
+    public string? PrevManufacturerName { get; set; }
+    public string? PrevPrevManufacturerName { get; set; }
+
+}

SmallSoftwareProject/SmallSoftwareContracts/ViewModels/PostViewModel.cs

@@ -0,0 +1,10 @@
+
+namespace SmallSoftwareContracts.ViewModels;
+
+public class PostViewModel
+{
+    public required string Id { get; set; }
+    public required string PostName { get; set; }
+    public required string PostType { get; set; }
+    public double Salary { get; set; }
+}

SmallSoftwareProject/SmallSoftwareContracts/ViewModels/RequestViewModel.cs

@@ -0,0 +1,14 @@
+
+namespace SmallSoftwareContracts.ViewModels;
+
+public class RequestViewModel
+{
+    public required string Id { get; set; }
+    public required string WorkerId { get; set; }
+    public required string WorkerFIO { get; set; }
+    public DateTime RequestDate { get; set; }
+    public double Sum { get; set; }
+    public bool IsCancel { get; set; }
+    public required List<InstallationRequestViewModel> Softwares { get; set; }
+
+}

SmallSoftwareProject/SmallSoftwareContracts/ViewModels/SalaryViewModel.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.ViewModels;
+
+public class SalaryViewModel
+{
+    public required string WorkerId { get; set; }
+    public required string WorkerFIO { get; set; }
+    public DateTime SalaryDate { get; set; }
+    public double Salary { get; set; }
+}

SmallSoftwareProject/SmallSoftwareContracts/ViewModels/SoftwareHistoryViewModel.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.ViewModels;
+
+public class SoftwareHistoryViewModel
+{
+    public required string SoftwareName { get; set; }
+    public double OldPrice { get; set; }
+    public DateTime ChangeDate { get; set; }
+}

SmallSoftwareProject/SmallSoftwareContracts/ViewModels/SoftwareViewModel.cs

@@ -0,0 +1,13 @@
+namespace SmallSoftwareContracts.ViewModels;
+
+public class SoftwareViewModel
+{
+    public required string Id { get; set; }
+    public required string SoftwareName { get; set; }
+    public required string ManufacturerId { get; set; }
+    public required string ManufacturerName { get; set; }
+    public required string SoftwareType { get; set; }
+    public double Price { get; set; }
+    public bool IsDeleted { get; set; }
+
+}

SmallSoftwareProject/SmallSoftwareContracts/ViewModels/WorkerViewModel.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareContracts.ViewModels;
+
+public class WorkerViewModel
+{
+    public required string Id { get; set; }
+    public required string FIO { get; set; }
+    public required string PostId { get; set; }
+    public required string PostName { get; set; }
+    public bool IsDeleted { get; set; }
+    public DateTime BirthDate { get; set; }
+    public DateTime EmploymentDate { get; set; }
+}

SmallSoftwareProject/SmallSoftwareDatabase/Implementations/ManufacturerStorageContract.cs

@@ -0,0 +1,166 @@
+using AutoMapper;
+using Microsoft.EntityFrameworkCore;
+using Npgsql;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.StoragesContracts;
+using SmallSoftwareDatabase.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareDatabase.Implementations;
+internal class ManufacturerStorageContract : IManufacturerStorageContract
+{
+    private readonly SmallSoftwareDbContext _dbContext;
+    private readonly Mapper _mapper; 
+public ManufacturerStorageContract(SmallSoftwareDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.AddMaps(typeof(Manufacturer));
+        });
+        _mapper = new Mapper(config);
+    }
+    public List<ManufacturerDataModel> GetList()
+    {
+        try
+        {
+            return [.. _dbContext.Manufacturers.Select(x => _mapper.Map<ManufacturerDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public ManufacturerDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return
+            _mapper.Map<ManufacturerDataModel>(GetManufacturerById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public ManufacturerDataModel? GetElementByName(string name)
+    {
+        try
+        {
+            return
+            _mapper.Map<ManufacturerDataModel>(_dbContext.Manufacturers.FirstOrDefault(x => x.ManufacturerName == name));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public ManufacturerDataModel? GetElementByOldName(string name)
+    {
+        try
+        {
+            return
+            _mapper.Map<ManufacturerDataModel>(_dbContext.Manufacturers.FirstOrDefault(x =>
+            x.PrevManufacturerName == name ||
+            x.PrevPrevManufacturerName == name));
+        } 
+        catch (Exception ex)
+{
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public void AddElement(ManufacturerDataModel manufacturerDataModel)
+    {
+        try
+        {
+            _dbContext.Manufacturers.Add(_mapper.Map<Manufacturer>(manufacturerDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (InvalidOperationException ex) when (ex.TargetSite?.Name ==
+        "ThrowIdentityConflict")
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Id",
+            manufacturerDataModel.Id);
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is
+        PostgresException { ConstraintName: "IX_Manufacturers_ManufacturerName" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("ManufacturerName",
+            manufacturerDataModel.ManufacturerName);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public void UpdElement(ManufacturerDataModel manufacturerDataModel)
+    {
+        try
+        {
+            var element = GetManufacturerById(manufacturerDataModel.Id) ??
+            throw new ElementNotFoundException(manufacturerDataModel.Id);
+            if (element.ManufacturerName !=
+            manufacturerDataModel.ManufacturerName)
+            {
+                element.PrevPrevManufacturerName =
+                element.PrevManufacturerName;
+                element.PrevManufacturerName = element.ManufacturerName;
+                element.ManufacturerName =
+                manufacturerDataModel.ManufacturerName;
+            }
+            _dbContext.Manufacturers.Update(element);
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is
+        PostgresException { ConstraintName: "IX_Manufacturers_ManufacturerName" })
+        {
+            _dbContext.ChangeTracker.Clear(); 
+        throw new ElementExistsException("ManufacturerName",
+        manufacturerDataModel.ManufacturerName);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetManufacturerById(id) ?? throw new
+            ElementNotFoundException(id);
+            _dbContext.Manufacturers.Remove(element);
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    private Manufacturer? GetManufacturerById(string id) =>
+    _dbContext.Manufacturers.FirstOrDefault(x => x.Id == id);
+}

SmallSoftwareProject/SmallSoftwareDatabase/Implementations/PostStorageContract.cs

@@ -0,0 +1,192 @@
+using AutoMapper;
+using Microsoft.EntityFrameworkCore;
+using Npgsql;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.StoragesContracts;
+using SmallSoftwareDatabase.Models;
+
+namespace SmallSoftwareDatabase.Implementations;
+
+internal class PostStorageContract : IPostStorageContract
+{
+    private readonly SmallSoftwareDbContext _dbContext;
+    private readonly Mapper _mapper;
+    public PostStorageContract(SmallSoftwareDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Post, PostDataModel>()
+                .ForMember(x => x.Id, x => x.MapFrom(src => src.PostId));
+            cfg.CreateMap<PostDataModel, Post>()
+                .ForMember(x => x.Id, x => x.Ignore())
+                .ForMember(x => x.PostId, x => x.MapFrom(src => src.Id))
+                .ForMember(x => x.IsActual, x => x.MapFrom(src => true))
+                .ForMember(x => x.ChangeDate, x => x.MapFrom(src => DateTime.UtcNow));
+                
+        });
+        _mapper = new Mapper(config);
+    }
+    public List<PostDataModel> GetList()
+    {
+        try
+        {
+            return [.._dbContext.Posts.Select(x => _mapper.Map<PostDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public List<PostDataModel> GetPostWithHistory(string postId)
+    {
+        try
+        {
+            return [.. _dbContext.Posts.Where(x => x.PostId == postId).Select(x => _mapper.Map<PostDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public PostDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return
+            _mapper.Map<PostDataModel>(_dbContext.Posts.FirstOrDefault(x => x.PostId == id &&
+            x.IsActual)); 
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public PostDataModel? GetElementByName(string name)
+    {
+        try
+        {
+            return
+            _mapper.Map<PostDataModel>(_dbContext.Posts.FirstOrDefault(x => x.PostName ==
+            name && x.IsActual));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public void AddElement(PostDataModel postDataModel)
+    {
+        try
+        {
+            _dbContext.Posts.Add(_mapper.Map<Post>(postDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is
+        PostgresException { ConstraintName: "IX_Posts_PostName_IsActual" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("PostName",
+            postDataModel.PostName);
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is
+        PostgresException { ConstraintName: "IX_Posts_PostId_IsActual" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("PostId", postDataModel.Id);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public void UpdElement(PostDataModel postDataModel)
+    {
+        try
+        {
+            var transaction = _dbContext.Database.BeginTransaction();
+            try
+            {
+                var element = GetPostById(postDataModel.Id) ?? throw new
+                ElementNotFoundException(postDataModel.Id);
+                if (!element.IsActual)
+                {
+                    throw new
+                    ElementDeletedException(postDataModel.Id);
+                } 
+            element.IsActual = false;
+                _dbContext.SaveChanges();
+                var newElement = _mapper.Map<Post>(postDataModel);
+                _dbContext.Posts.Add(newElement);
+                _dbContext.SaveChanges();
+                transaction.Commit();
+            }
+            catch
+            {
+                transaction.Rollback();
+                throw;
+            }
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is
+        PostgresException { ConstraintName: "IX_Posts_PostName_IsActual" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("PostName",
+            postDataModel.PostName);
+        }
+        catch (Exception ex) when (ex is ElementDeletedException || ex is
+        ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetPostById(id) ?? throw new
+            ElementNotFoundException(id);
+            if (!element.IsActual)
+            {
+                throw new ElementDeletedException(id);
+            }
+            element.IsActual = false;
+            _dbContext.SaveChanges();
+        }
+        catch
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+    }
+    public void ResElement(string id)
+    {
+        try
+        {
+            var element = GetPostById(id) ?? throw new
+            ElementNotFoundException(id);
+            element.IsActual = true;
+            _dbContext.SaveChanges();
+        }
+        catch
+        { 
+        _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+    }
+    private Post? GetPostById(string id) => _dbContext.Posts.Where(x =>
+    x.PostId == id).OrderByDescending(x => x.ChangeDate).FirstOrDefault();
+}
+

SmallSoftwareProject/SmallSoftwareDatabase/Implementations/RequestStorageContract.cs

@@ -0,0 +1,118 @@
+using AutoMapper;
+using Microsoft.EntityFrameworkCore;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.StoragesContracts;
+using SmallSoftwareDatabase.Models;
+
+namespace SmallSoftwareDatabase.Implementations;
+
+internal class RequestStorageContract : IRequestStorageContract
+{
+    private readonly SmallSoftwareDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public RequestStorageContract(SmallSoftwareDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Manufacturer, ManufacturerDataModel>();
+            cfg.CreateMap<Software, SoftwareDataModel>();
+            cfg.CreateMap<Worker, WorkerDataModel>();
+            cfg.CreateMap<InstallationRequest, InstallationRequestDataModel>();
+            cfg.CreateMap<InstallationRequestDataModel, InstallationRequest>()
+                .ForMember(x => x.SoftwareId, x => x.MapFrom(src => src.SoftwareId));
+            cfg.CreateMap<Request, RequestDataModel>();
+            cfg.CreateMap<RequestDataModel, Request>()
+                .ForMember(x => x.IsCancel, x => x.MapFrom(src => false))
+                .ForMember(x => x.InstallationRequests, x => x.MapFrom(src => src.Softwares))
+                .ForMember(x => x.Worker, x => x.Ignore())
+                .ForMember(dest => dest.RequestDate, opt => opt.MapFrom(src => src.RequestDate))
+                .ForMember(dest => dest.RequestDate, opt => opt.MapFrom(src => src.RequestDate));
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public List<RequestDataModel> GetList(DateTime? startDate = null, DateTime? endDate = null, string? workerId = null, string? softwareId = null)
+    {
+        try
+        {
+            var query = _dbContext.Requests.Include(x => x.Worker).Include(x => x.InstallationRequests).AsQueryable();
+            if (workerId is not null)
+            {
+                query = query.Where(x => x.WorkerId == workerId);
+            }
+            if (softwareId is not null)
+            {
+                query = query.Where(x => x.InstallationRequests!.Any(y => y.SoftwareId == softwareId));
+            }
+            return [.. query.Select(x => _mapper.Map<RequestDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public RequestDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<RequestDataModel>(GetRequestById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void AddElement(RequestDataModel requestDataModel)
+    {
+        try
+        {
+            _dbContext.Requests.Add(_mapper.Map<Request>(requestDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetRequestById(id) ?? throw new ElementNotFoundException(id);
+
+            if (element.IsCancel)
+            {
+                throw new ElementDeletedException(id);
+            }
+
+            element.IsCancel = true;
+            _dbContext.SaveChanges();
+        }
+        catch (Exception ex) when (ex is ElementDeletedException || ex is ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    private Request? GetRequestById(string id)  =>
+        _dbContext.Requests
+            .Include(x => x.Worker)
+            .Include(x => x.InstallationRequests)!
+            .ThenInclude(x => x.Software)
+            .FirstOrDefault(x => x.Id == id);
+}

SmallSoftwareProject/SmallSoftwareDatabase/Implementations/SalaryStorageContract.cs

@@ -0,0 +1,56 @@
+using AutoMapper;
+using Microsoft.EntityFrameworkCore;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.StoragesContracts;
+using SmallSoftwareDatabase.Models;
+
+namespace SmallSoftwareDatabase.Implementations;
+
+internal class SalaryStorageContract : ISalaryStorageContract
+{
+    private readonly SmallSoftwareDbContext _dbContext;
+    private readonly Mapper _mapper; 
+    public SalaryStorageContract(SmallSoftwareDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Worker, WorkerDataModel>();
+            cfg.CreateMap<Salary, SalaryDataModel>();
+            cfg.CreateMap<SalaryDataModel, Salary>()
+                .ForMember(dest => dest.WorkerSalary, opt => opt.MapFrom(src => src.Salary));
+        });
+        _mapper = new Mapper(config);
+    }
+    public List<SalaryDataModel> GetList(DateTime startDate, DateTime endDate, string? workerId = null)
+    {
+        try
+        {
+            var query = _dbContext.Salaries.Include(x => x.Worker).Where(x => x.SalaryDate >= startDate && x.SalaryDate <= endDate);
+            if (workerId is not null)
+            {
+                query = query.Where(x => x.WorkerId == workerId);
+            }
+            return [.. query.Select(x => _mapper.Map<SalaryDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public void AddElement(SalaryDataModel salaryDataModel)
+    {
+        try
+        {
+            _dbContext.Salaries.Add(_mapper.Map<Salary>(salaryDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+}

SmallSoftwareProject/SmallSoftwareDatabase/Implementations/SoftwareStorageContract.cs

@@ -0,0 +1,187 @@
+using AutoMapper;
+using Microsoft.EntityFrameworkCore;
+using Npgsql;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.StoragesContracts;
+using SmallSoftwareDatabase.Models;
+
+namespace SmallSoftwareDatabase.Implementations;
+
+internal class SoftwareStorageContract : ISoftwareStorageContract
+{
+    private readonly SmallSoftwareDbContext _dbContext;
+    private readonly Mapper _mapper;
+    public SoftwareStorageContract(SmallSoftwareDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Manufacturer, ManufacturerDataModel>();
+            cfg.CreateMap<Software, SoftwareDataModel>();
+            cfg.CreateMap<SoftwareDataModel, Software>()
+            .ForMember(x => x.IsDeleted, x => x.MapFrom(src => false)); 
+        cfg.CreateMap<SoftwareHistory, SoftwareHistoryDataModel>();
+        });
+        _mapper = new Mapper(config);
+    }
+    public List<SoftwareDataModel> GetList(bool onlyActive = true, string?
+    manufacturerId = null)
+    {
+        try
+        {
+            var query = _dbContext.Softwares.Include(x => x.Manufacturer).AsQueryable();
+            if (onlyActive)
+            {
+                query = query.Where(x => !x.IsDeleted);
+            }
+            if (manufacturerId is not null)
+            {
+                query = query.Where(x => x.ManufacturerId ==
+                manufacturerId);
+            }
+            return [.. query.Select(x => _mapper.Map<SoftwareDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public List<SoftwareHistoryDataModel> GetHistoryBySoftwareId(string
+    softwareId)
+    {
+        try
+        {
+            return [.. _dbContext.SoftwareHistories.Include(x => x.Software).Where(x => x.SoftwareId == softwareId)
+                .OrderByDescending(x => x.ChangeDate)
+                .Select(x => _mapper.Map<SoftwareHistoryDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public SoftwareDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<SoftwareDataModel>(GetSoftwareById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public SoftwareDataModel? GetElementByName(string name)
+    {
+        try
+        {
+        return
+        _mapper.Map<SoftwareDataModel>(_dbContext.Softwares.Include(x => x.Manufacturer).FirstOrDefault(x =>
+        x.SoftwareName == name && !x.IsDeleted));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public void AddElement(SoftwareDataModel softwareDataModel)
+    {
+        try
+        {
+            _dbContext.Softwares.Add(_mapper.Map<Software>(softwareDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (InvalidOperationException ex) when (ex.TargetSite?.Name ==
+        "ThrowIdentityConflict")
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Id", softwareDataModel.Id);
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is
+        PostgresException { ConstraintName: "IX_Softwares_SoftwareName_IsDeleted" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("SoftwareName",
+            softwareDataModel.SoftwareName);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public void UpdElement(SoftwareDataModel softwareDataModel)
+    {
+        try
+        {
+            var transaction = _dbContext.Database.BeginTransaction();
+            try
+            {
+                var element = GetSoftwareById(softwareDataModel.Id) ??
+                throw new ElementNotFoundException(softwareDataModel.Id);
+                if (element.Price != softwareDataModel.Price)
+                {
+                    _dbContext.SoftwareHistories.Add(new
+                    SoftwareHistory()
+                    { SoftwareId = element.Id, OldPrice = element.Price });
+                    _dbContext.SaveChanges();
+                }
+                _dbContext.Softwares.Update(_mapper.Map(softwareDataModel,
+                element));
+                _dbContext.SaveChanges();
+                transaction.Commit();
+            }
+            catch
+            {
+                transaction.Rollback();
+                throw;
+            } 
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is
+        PostgresException { ConstraintName: "IX_Softwares_SoftwareName_IsDeleted" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("SoftwareName",
+            softwareDataModel.SoftwareName);
+        }
+        catch (Exception ex) when (ex is ElementDeletedException || ex is
+        ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetSoftwareById(id) ?? throw new
+            ElementNotFoundException(id);
+            element.IsDeleted = true;
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    private Software? GetSoftwareById(string id) =>
+    _dbContext.Softwares.Include(x => x.Manufacturer).FirstOrDefault(x => x.Id == id && !x.IsDeleted);
+}
+

SmallSoftwareProject/SmallSoftwareDatabase/Implementations/WorkerStorageContract.cs

@@ -0,0 +1,160 @@
+using AutoMapper;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.StoragesContracts;
+using SmallSoftwareDatabase.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareDatabase.Implementations;
+
+internal class WorkerStorageContract : IWorkerStorageContract
+{
+    private readonly SmallSoftwareDbContext _dbContext;
+    private readonly Mapper _mapper;
+    public WorkerStorageContract(SmallSoftwareDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Post, PostDataModel>() 
+        .ForMember(x => x.Id, x => x.MapFrom(src =>
+        src.PostId));
+            cfg.CreateMap<Worker, WorkerDataModel>();
+            cfg.CreateMap<WorkerDataModel, Worker>()
+            .ForMember(x => x.Post, x => x.Ignore());
+        });
+        _mapper = new Mapper(config);
+    }
+    public List<WorkerDataModel> GetList(bool onlyActive = true, string? postId
+    = null, DateTime? fromBirthDate = null, DateTime? toBirthDate = null, DateTime?
+    fromEmploymentDate = null, DateTime? toEmploymentDate = null)
+    {
+        try
+        {
+            var query = _dbContext.Workers.AsQueryable();
+            if (onlyActive)
+            {
+                query = query.Where(x => !x.IsDeleted);
+            }
+            if (postId is not null)
+            {
+                query = query.Where(x => x.PostId == postId);
+            }
+            if (fromBirthDate is not null && toBirthDate is not null)
+            {
+                query = query.Where(x => x.BirthDate >= fromBirthDate &&
+                x.BirthDate <= toBirthDate);
+            }
+            if (fromEmploymentDate is not null && toEmploymentDate is not
+            null)
+            {
+                query = query.Where(x => x.EmploymentDate >=
+                fromEmploymentDate && x.EmploymentDate <= toEmploymentDate);
+            }
+            return [.. JoinPost(query).Select(x => _mapper.Map<WorkerDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public WorkerDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<WorkerDataModel>(GetWorkerById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public WorkerDataModel? GetElementByFIO(string fio)
+    {
+        try
+        { 
+        return
+        _mapper.Map<WorkerDataModel>(AddPost(_dbContext.Workers.FirstOrDefault(x => x.FIO == fio && !x.IsDeleted)));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public void AddElement(WorkerDataModel workerDataModel)
+    {
+        try
+        {
+            _dbContext.Workers.Add(_mapper.Map<Worker>(workerDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (InvalidOperationException ex) when (ex.TargetSite?.Name == "ThrowIdentityConflict")
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Id", workerDataModel.Id);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public void UpdElement(WorkerDataModel workerDataModel)
+    {
+        try
+        {
+            var element = GetWorkerById(workerDataModel.Id) ?? throw new
+            ElementNotFoundException(workerDataModel.Id);
+            _dbContext.Workers.Update(_mapper.Map(workerDataModel,
+            element));
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetWorkerById(id) ?? throw new
+            ElementNotFoundException(id);
+            element.IsDeleted = true;
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        { 
+        _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+    private Worker? GetWorkerById(string id) =>
+    AddPost(_dbContext.Workers.FirstOrDefault(x => x.Id == id && !x.IsDeleted));
+    private IQueryable<Worker> JoinPost(IQueryable<Worker> query)
+    => query.GroupJoin(_dbContext.Posts.Where(x => x.IsActual), x =>
+    x.PostId, y => y.PostId, (x, y) => new { Worker = x, Post = y })
+    .SelectMany(xy => xy.Post.DefaultIfEmpty(), (x, y) =>
+    x.Worker.AddPost(y));
+    private Worker? AddPost(Worker? worker)
+    => worker?.AddPost(_dbContext.Posts.FirstOrDefault(x => x.PostId ==
+    worker.PostId && x.IsActual));
+}

SmallSoftwareProject/SmallSoftwareDatabase/Models/InstallationRequest.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareDatabase.Models;
+
+internal class InstallationRequest
+{
+    public required string SoftwareId { get; set; } 
+    public required string RequestId { get; set; } 
+    public int Count { get; set; } 
+    public double Price { get; set; }
+    public Request? Request { get; set; }
+    public Software? Software { get; set; }
+
+}

SmallSoftwareProject/SmallSoftwareDatabase/Models/Manufacturer.cs

@@ -0,0 +1,23 @@
+using AutoMapper;
+using SmallSoftwareContracts.DataModels;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareDatabase.Models;
+
+[AutoMap(typeof(ManufacturerDataModel), ReverseMap = true)]
+internal class Manufacturer
+{
+    public required string Id { get; set; }
+    public required string ManufacturerName { get; set; }
+    public string? PrevManufacturerName { get; set; }
+    public string? PrevPrevManufacturerName { get; set; }
+   
+    [ForeignKey("ManufacturerId")]
+    public List<Software>? Softwares { get; set; }
+
+}

SmallSoftwareProject/SmallSoftwareDatabase/Models/Post.cs

@@ -0,0 +1,14 @@
+using SmallSoftwareContracts.Enums; 
+
+namespace SmallSoftwareDatabase.Models;
+
+internal class Post
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public required string PostId { get; set; }
+    public required string PostName { get; set; }
+    public PostType PostType { get; set; }
+    public double Salary { get; set; }
+    public bool IsActual { get; set; }
+    public DateTime ChangeDate { get; set; } 
+}

SmallSoftwareProject/SmallSoftwareDatabase/Models/Request.cs

@@ -0,0 +1,17 @@
+using System.ComponentModel.DataAnnotations.Schema; 
+
+namespace SmallSoftwareDatabase.Models;
+
+internal class Request
+{
+    public string Id { get; set; }  = Guid.NewGuid().ToString();
+    public required string WorkerId { get; set; } 
+    public DateTime RequestDate { get; set; }
+    public required string Email { get; set; } 
+    public double Sum { get; set; }
+    public bool IsCancel { get; set; } 
+    public Worker? Worker { get; set; }
+
+    [ForeignKey("RequestId")]
+    public List<InstallationRequest>? InstallationRequests { get; set; }
+}

SmallSoftwareProject/SmallSoftwareDatabase/Models/Salary.cs

@@ -0,0 +1,11 @@
+namespace SmallSoftwareDatabase.Models;
+
+internal class Salary
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public required string WorkerId { get; set; }
+    public double WorkerSalary { get; set; }
+    public DateTime SalaryDate { get; set; } 
+    public Worker? Worker { get; set; }
+}
+

SmallSoftwareProject/SmallSoftwareDatabase/Models/Software.cs

@@ -0,0 +1,24 @@
+using SmallSoftwareContracts.Enums;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace SmallSoftwareDatabase.Models;
+
+internal class Software
+{
+    public required string Id { get; set; } 
+    public required string SoftwareName { get; set; } 
+    public SoftwareType SoftwareType { get; set; } 
+    public required string ManufacturerId { get; set; } 
+    public double Price { get; set; } 
+    public bool IsDeleted { get; set; } 
+    public string? PrevSoftwareName { get; set; }
+    public string? PrevPrevSoftwareName { get; set; } 
+    public Manufacturer? Manufacturer { get; set; }
+
+    [ForeignKey("SoftwareId")]
+    public List<SoftwareHistory>? SoftwareHistories { get; set; }
+
+    [ForeignKey("SoftwareId")]
+    public List<InstallationRequest>? InstallationRequests { get; set; }
+
+}

SmallSoftwareProject/SmallSoftwareDatabase/Models/SoftwareHistory.cs

@@ -0,0 +1,11 @@
+namespace SmallSoftwareDatabase.Models;
+
+internal class SoftwareHistory
+{
+    public string Id { get; set; } = Guid.NewGuid().ToString();
+    public required string SoftwareId { get; set; } 
+    public double OldPrice { get; set; }
+    public DateTime ChangeDate { get; set; } = DateTime.UtcNow;
+
+    public Software? Software { get; set; }
+}

SmallSoftwareProject/SmallSoftwareDatabase/Models/Worker.cs

@@ -0,0 +1,26 @@
+using AutoMapper;
+using SmallSoftwareContracts.DataModels; 
+using System.ComponentModel.DataAnnotations.Schema; 
+namespace SmallSoftwareDatabase.Models;
+[AutoMap(typeof(WorkerDataModel), ReverseMap = true)]
+internal class Worker
+{
+    public required string Id { get; set; }
+    public required string FIO { get; set; }
+    public required string PostId { get; set; }
+    public DateTime BirthDate { get; set; }
+    public DateTime EmploymentDate { get; set; }
+    public bool IsDeleted { get; set; }
+    [NotMapped]
+    public Post? Post { get; set; }
+    [ForeignKey("WorkerId")]
+    public List<Salary>? Salaries { get; set; }
+    [ForeignKey("WorkerId")]
+    public List<Request>? Requests { get; set; }
+    public Worker AddPost(Post? post)
+    {
+        Post = post;
+        return this;
+    }
+
+}

SmallSoftwareProject/SmallSoftwareDatabase/SmallSoftwareDatabase.csproj

@@ -0,0 +1,25 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="AutoMapper" Version="14.0.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.2" />
+    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="9.0.3" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\SmallSoftwareContracts\SmallSoftwareContracts.csproj" />
+  </ItemGroup>
+
+	<ItemGroup> 
+		<InternalsVisibleTo Include="SmallSoftwareWebApi" />
+		<InternalsVisibleTo Include="SmallSoftwareTests" />
+		<InternalsVisibleTo Include="DynamicProxyGenAssembly2" />
+	</ItemGroup>
+
+</Project>

SmallSoftwareProject/SmallSoftwareDatabase/SmallSoftwareDbContext.cs

@@ -0,0 +1,55 @@
+using Microsoft.EntityFrameworkCore;
+using SmallSoftwareContracts.Infrastructure;
+using SmallSoftwareDatabase.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareDatabase;
+
+internal class SmallSoftwareDbContext : DbContext
+{
+    private readonly IConfigurationDatabase? _configurationDatabase;
+
+    public SmallSoftwareDbContext(IConfigurationDatabase configurationDatabase)
+    {
+        _configurationDatabase = configurationDatabase;
+        AppContext.SetSwitch("Npgsql.EnableLegacyTimestampBehavior", true);
+        AppContext.SetSwitch("Npgsql.DisableDateTimeInfinityConversions", true);
+    }
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+    {
+        optionsBuilder.UseNpgsql(_configurationDatabase?.ConnectionString, o => o.SetPostgresVersion(12, 2));
+        base.OnConfiguring(optionsBuilder);
+    }
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        base.OnModelCreating(modelBuilder); 
+        modelBuilder.Entity<Manufacturer>().HasIndex(x => x.ManufacturerName).IsUnique();
+        modelBuilder.Entity<Post>().HasIndex(e => new { e.PostName, e.IsActual })
+            .IsUnique()
+            .HasFilter($"\"{nameof(Post.IsActual)}\" = TRUE");
+        modelBuilder.Entity<Post>().HasIndex(e => new { e.PostId, e.IsActual })
+            .IsUnique() 
+            .HasFilter($"\"{nameof(Post.IsActual)}\" = TRUE");
+        modelBuilder.Entity<Software>().HasIndex(x => new { x.SoftwareName, x.IsDeleted })
+            .IsUnique()
+            .HasFilter($"\"{nameof(Software.IsDeleted)}\" = FALSE");
+        modelBuilder.Entity<Software>()
+            .HasOne(e => e.Manufacturer)
+            .WithMany(e => e.Softwares)
+            .OnDelete(DeleteBehavior.Restrict);
+        modelBuilder.Entity<InstallationRequest>().HasKey(x => new { x.RequestId, x.SoftwareId });
+    }
+    public DbSet<Manufacturer> Manufacturers { get; set; }
+    public DbSet<Post> Posts { get; set; }
+    public DbSet<Software> Softwares { get; set; }
+    public DbSet<SoftwareHistory> SoftwareHistories { get; set; }
+    public DbSet<Salary> Salaries { get; set; }
+    public DbSet<Request> Requests { get; set; }
+    public DbSet<InstallationRequest> InstallationRequests { get; set; }
+    public DbSet<Worker> Workers { get; set; }
+}

SmallSoftwareProject/SmallSoftwareProject.sln

@@ -1,10 +1,18 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
-VisualStudioVersion = 17.12.35728.132 d17.12
+VisualStudioVersion = 17.12.35728.132
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SmallSoftwareContracts", "SmallSoftwareContracts\SmallSoftwareContracts.csproj", "{07D2A792-3603-47CB-B5A3-9736E582F496}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SmallSoftwareTests", "SmallSoftwareTests\SmallSoftwareTests.csproj", "{A98AC101-F5F5-4270-97D6-B5FA766D3E64}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SmallSoftwareBusinessLogic", "SmallSoftwareBusinessLogic\SmallSoftwareBusinessLogic.csproj", "{C4E0D33E-8DBB-4BB5-8CCE-D2888F754EC7}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SmallSoftwareDatabase", "SmallSoftwareDatabase\SmallSoftwareDatabase.csproj", "{59771C74-7A34-4354-949A-F3AA071FBCAA}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SmallSoftwareWebApi", "SmallSoftwareWebApi\SmallSoftwareWebApi.csproj", "{AC51FBAD-A0B1-40C3-AD75-E29F6E7FD624}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -15,6 +23,22 @@ Global
 		{07D2A792-3603-47CB-B5A3-9736E582F496}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{07D2A792-3603-47CB-B5A3-9736E582F496}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{07D2A792-3603-47CB-B5A3-9736E582F496}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A98AC101-F5F5-4270-97D6-B5FA766D3E64}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A98AC101-F5F5-4270-97D6-B5FA766D3E64}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A98AC101-F5F5-4270-97D6-B5FA766D3E64}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A98AC101-F5F5-4270-97D6-B5FA766D3E64}.Release|Any CPU.Build.0 = Release|Any CPU
+		{C4E0D33E-8DBB-4BB5-8CCE-D2888F754EC7}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C4E0D33E-8DBB-4BB5-8CCE-D2888F754EC7}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C4E0D33E-8DBB-4BB5-8CCE-D2888F754EC7}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C4E0D33E-8DBB-4BB5-8CCE-D2888F754EC7}.Release|Any CPU.Build.0 = Release|Any CPU
+		{59771C74-7A34-4354-949A-F3AA071FBCAA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{59771C74-7A34-4354-949A-F3AA071FBCAA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{59771C74-7A34-4354-949A-F3AA071FBCAA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{59771C74-7A34-4354-949A-F3AA071FBCAA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{AC51FBAD-A0B1-40C3-AD75-E29F6E7FD624}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{AC51FBAD-A0B1-40C3-AD75-E29F6E7FD624}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{AC51FBAD-A0B1-40C3-AD75-E29F6E7FD624}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{AC51FBAD-A0B1-40C3-AD75-E29F6E7FD624}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

SmallSoftwareProject/SmallSoftwareTests/BusinessLogicsContractsTests/ManufacturerBusinessLogicContractTests.cs

@@ -0,0 +1,446 @@
+using Microsoft.Extensions.Logging;
+using Moq;
+using SmallSoftwareBusinessLogic.Implementations;
+using SmallSoftwareContracts.BusinessLogicsContracts;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.StoragesContracts;
+
+namespace SmallSoftwareTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+internal class ManufacturerBusinessLogicContractTests
+{
+    private IManufacturerBusinessLogicContract _manufacturerBusinessLogicContract;
+    private Mock<IManufacturerStorageContract> _manufacturerStorageContract;
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        _manufacturerStorageContract = new
+        Mock<IManufacturerStorageContract>();
+        _manufacturerBusinessLogicContract = new ManufacturerBusinessLogicContract(_manufacturerStorageContract.Object, new Mock<ILogger>().Object);
+    }
+    [SetUp]
+    public void SetUp()
+    {
+        _manufacturerStorageContract.Reset();
+    }
+    [Test]
+    public void GetAllManufacturers_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var listOriginal = new List<ManufacturerDataModel>()
+    {
+    new(Guid.NewGuid().ToString(), "name 1", null, null),
+    new(Guid.NewGuid().ToString(), "name 2", null, null),
+    new(Guid.NewGuid().ToString(), "name 3", null, null),
+    };
+        _manufacturerStorageContract.Setup(x =>
+        x.GetList()).Returns(listOriginal);
+        //Act
+        var list = _manufacturerBusinessLogicContract.GetAllManufacturers();
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+    }
+    [Test]
+    public void GetAllManufacturers_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _manufacturerStorageContract.Setup(x => x.GetList()).Returns([]);
+        //Act
+        var list = _manufacturerBusinessLogicContract.GetAllManufacturers();
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _manufacturerStorageContract.Verify(x => x.GetList(), Times.Once);
+    }
+    [Test]
+    public void GetAllManufacturers_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.GetAllManufacturers(),
+        Throws.TypeOf<NullListException>());
+        _manufacturerStorageContract.Verify(x => x.GetList(), Times.Once);
+    }
+    [Test]
+    public void GetAllManufacturers_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _manufacturerStorageContract.Setup(x => x.GetList()).Throws(new
+        StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.GetAllManufacturers(),
+        Throws.TypeOf<StorageException>());
+        _manufacturerStorageContract.Verify(x => x.GetList(), Times.Once);
+    }
+    [Test]
+    public void GetManufacturerByData_GetById_ReturnRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var record = new ManufacturerDataModel(id, "name", null, null);
+        _manufacturerStorageContract.Setup(x =>
+        x.GetElementById(id)).Returns(record);
+        
+    //Act
+        var element =
+        _manufacturerBusinessLogicContract.GetManufacturerByData(id);
+                //Assert
+                Assert.That(element, Is.Not.Null);
+                Assert.That(element.Id, Is.EqualTo(id));
+                _manufacturerStorageContract.Verify(x =>
+                x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetManufacturerByData_GetByName_ReturnRecord_Test()
+    {
+        //Arrange
+        var manufacturerName = "name";
+        var record = new ManufacturerDataModel(Guid.NewGuid().ToString(),
+        manufacturerName, null, null);
+        _manufacturerStorageContract.Setup(x =>
+        x.GetElementByName(manufacturerName)).Returns(record);
+        //Act
+        var element =
+        _manufacturerBusinessLogicContract.GetManufacturerByData(manufacturerName);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.ManufacturerName, Is.EqualTo(manufacturerName));
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetManufacturerByData_GetByOldName_ReturnRecord_Test()
+    {
+        //Arrange
+        var manufacturerOldName = "name before";
+        var record = new ManufacturerDataModel(Guid.NewGuid().ToString(),
+        "name", manufacturerOldName, null);
+        _manufacturerStorageContract.Setup(x =>
+        x.GetElementByOldName(manufacturerOldName)).Returns(record);
+        //Act
+        var element =
+        _manufacturerBusinessLogicContract.GetManufacturerByData(manufacturerOldName);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.PrevManufacturerName,
+        Is.EqualTo(manufacturerOldName));
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Once);
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementByOldName(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetManufacturerByData_EmptyData_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.GetManufacturerByData(null),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.GetManufacturerByData(string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Never); 
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Never);
+            _manufacturerStorageContract.Verify(x =>
+            x.GetElementByOldName(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void
+    GetManufacturerByData__GetById_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.GetManufacturerByData(Guid.NewGuid().ToString(
+        )), Throws.TypeOf<ElementNotFoundException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Once);
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Never);
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementByOldName(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void
+    GetManufacturerByData_GetByNameOrOldName_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.GetManufacturerByData("name"),
+        Throws.TypeOf<ElementNotFoundException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Never);
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Once);
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementByOldName(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetManufacturerByData_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _manufacturerStorageContract.Setup(x =>
+        x.GetElementById(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        _manufacturerStorageContract.Setup(x =>
+        x.GetElementByName(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.GetManufacturerByData(Guid.NewGuid().ToString(
+        )), Throws.TypeOf<StorageException>());
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.GetManufacturerByData("name"),
+        Throws.TypeOf<StorageException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Once);
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Once);
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementByOldName(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+ 
+    public void
+    GetManufacturerByData_GetByOldName_StorageThrowError_ThrowException_Test()
+        {
+        //Arrange
+        _manufacturerStorageContract.Setup(x =>
+        x.GetElementByOldName(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.GetManufacturerByData("name"),
+        Throws.TypeOf<StorageException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Once);
+        _manufacturerStorageContract.Verify(x =>
+        x.GetElementByOldName(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void InsertManufacturer_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new ManufacturerDataModel(Guid.NewGuid().ToString(),
+        "name", null, null);
+        _manufacturerStorageContract.Setup(x =>
+        x.AddElement(It.IsAny<ManufacturerDataModel>()))
+        .Callback((ManufacturerDataModel x) =>
+        {
+            flag = x.Id == record.Id && x.ManufacturerName ==
+    record.ManufacturerName;
+        });
+        //Act
+        _manufacturerBusinessLogicContract.InsertManufacturer(record);
+        //Assert
+        _manufacturerStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<ManufacturerDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void InsertManufacturer_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _manufacturerStorageContract.Setup(x =>
+        x.AddElement(It.IsAny<ManufacturerDataModel>())).Throws(new
+        ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.InsertManufacturer(new(Guid.NewGuid().ToString
+        (), "name", null, null)), Throws.TypeOf<ElementExistsException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<ManufacturerDataModel>()), Times.Once);
+    }
+    [Test]
+    public void InsertManufacturer_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.InsertManufacturer(null),
+        Throws.TypeOf<ArgumentNullException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<ManufacturerDataModel>()), Times.Never);
+    } 
+    [Test]
+    public void InsertManufacturer_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.InsertManufacturer(new
+        ManufacturerDataModel("id", "name", null, null)),
+        Throws.TypeOf<ValidationException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<ManufacturerDataModel>()), Times.Never);
+    }
+    [Test]
+    public void InsertManufacturer_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _manufacturerStorageContract.Setup(x =>
+        x.AddElement(It.IsAny<ManufacturerDataModel>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.InsertManufacturer(new(Guid.NewGuid().ToString
+        (), "name", null, null)), Throws.TypeOf<StorageException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<ManufacturerDataModel>()), Times.Once);
+    }
+    [Test]
+    public void UpdateManufacturer_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new ManufacturerDataModel(Guid.NewGuid().ToString(),
+        "name", null, null);
+        _manufacturerStorageContract.Setup(x =>
+        x.UpdElement(It.IsAny<ManufacturerDataModel>()))
+        .Callback((ManufacturerDataModel x) =>
+        {
+            flag = x.Id == record.Id && x.ManufacturerName ==
+    record.ManufacturerName;
+        });
+        //Act
+        _manufacturerBusinessLogicContract.UpdateManufacturer(record);
+        //Assert
+        _manufacturerStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<ManufacturerDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void
+    UpdateManufacturer_RecordWithIncorrectData_ThrowException_Test()
+    {
+        //Arrange
+        _manufacturerStorageContract.Setup(x =>
+        x.UpdElement(It.IsAny<ManufacturerDataModel>())).Throws(new
+        ElementNotFoundException(""));
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.UpdateManufacturer(new(Guid.NewGuid().ToString
+        (), "name", null, null)), Throws.TypeOf<ElementNotFoundException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<ManufacturerDataModel>()), Times.Once); 
+    }
+    [Test]
+    public void UpdateManufacturer_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _manufacturerStorageContract.Setup(x =>
+        x.UpdElement(It.IsAny<ManufacturerDataModel>())).Throws(new
+        ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.UpdateManufacturer(new(Guid.NewGuid().ToString
+        (), "name", null, null)), Throws.TypeOf<ElementExistsException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<ManufacturerDataModel>()), Times.Once);
+    }
+    [Test]
+    public void UpdateManufacturer_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.UpdateManufacturer(null),
+        Throws.TypeOf<ArgumentNullException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<ManufacturerDataModel>()), Times.Never);
+    }
+    [Test]
+    public void UpdateManufacturer_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.UpdateManufacturer(new
+        ManufacturerDataModel("id", "name", null, null)),
+        Throws.TypeOf<ValidationException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<ManufacturerDataModel>()), Times.Never);
+    }
+    [Test]
+    public void UpdateManufacturer_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _manufacturerStorageContract.Setup(x =>
+        x.UpdElement(It.IsAny<ManufacturerDataModel>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.UpdateManufacturer(new(Guid.NewGuid().ToString
+        (), "name", null, null)), Throws.TypeOf<StorageException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<ManufacturerDataModel>()), Times.Once);
+    }
+    [Test]
+    public void DeleteManufacturer_CorrectRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var flag = false;
+        _manufacturerStorageContract.Setup(x => x.DelElement(It.Is((string x)
+        => x == id))).Callback(() => { flag = true; });
+        //Act 
+        _manufacturerBusinessLogicContract.DeleteManufacturer(id);
+        //Assert
+        _manufacturerStorageContract.Verify(x =>
+        x.DelElement(It.IsAny<string>()), Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void DeleteManufacturer_RecordWithIncorrectId_ThrowException_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        _manufacturerStorageContract.Setup(x =>
+        x.DelElement(It.IsAny<string>())).Throws(new ElementNotFoundException(id));
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.DeleteManufacturer(Guid.NewGuid().ToString()),
+        Throws.TypeOf<ElementNotFoundException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.DelElement(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void DeleteManufacturer_IdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.DeleteManufacturer(null),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.DeleteManufacturer(string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.DelElement(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void DeleteManufacturer_IdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.DeleteManufacturer("id"),
+        Throws.TypeOf<ValidationException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.DelElement(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void DeleteManufacturer_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _manufacturerStorageContract.Setup(x =>
+        x.DelElement(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _manufacturerBusinessLogicContract.DeleteManufacturer(Guid.NewGuid().ToString()),
+        Throws.TypeOf<StorageException>());
+        _manufacturerStorageContract.Verify(x =>
+        x.DelElement(It.IsAny<string>()), Times.Once);
+    }
+}

SmallSoftwareProject/SmallSoftwareTests/BusinessLogicsContractsTests/PostBusinessLogicContractTests.cs

@@ -0,0 +1,556 @@
+using Microsoft.Extensions.Logging;
+using Moq;
+using SmallSoftwareBusinessLogic.Implementations;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Enums;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.StoragesContracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+internal class PostBusinessLogicContractTests
+{
+    private PostBusinessLogicContract _postBusinessLogicContract;
+    private Mock<IPostStorageContract> _postStorageContract;
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        _postStorageContract = new Mock<IPostStorageContract>();
+        _postBusinessLogicContract = new
+        PostBusinessLogicContract(_postStorageContract.Object, new
+        Mock<ILogger>().Object);
+    }
+    [SetUp]
+    public void SetUp()
+    {
+        _postStorageContract.Reset();
+    }
+    [Test]
+    public void GetAllPosts_ReturnListOfRecords_Test()
+    {//Arrange
+        var listOriginal = new List<PostDataModel>()
+        {
+        new(Guid.NewGuid().ToString(),"name 1", PostType.SoftInstaller,
+        10),
+        new(Guid.NewGuid().ToString(), "name 2", PostType.SoftInstaller,
+        10),
+        new(Guid.NewGuid().ToString(), "name 3", PostType.SoftInstaller,
+        10),
+        };
+        _postStorageContract.Setup(x => x.GetList()).Returns(listOriginal);
+        //Act
+        var list = _postBusinessLogicContract.GetAllPosts();
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(list, Is.Not.Null);
+            Assert.That(list, Is.EquivalentTo(listOriginal));
+        });
+        _postStorageContract.Verify(x => x.GetList(), Times.Once);
+    }
+    [Test]
+    public void GetAllPosts_ReturnEmptyList_Test()
+    { 
+        //Arrange
+        _postStorageContract.Setup(x =>
+        x.GetList()).Returns([]);
+        //Act
+        var listOnlyActive = _postBusinessLogicContract.GetAllPosts();
+        var listAll = _postBusinessLogicContract.GetAllPosts();
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null);
+            Assert.That(listAll, Is.Not.Null);
+            Assert.That(listOnlyActive, Has.Count.EqualTo(0));
+            Assert.That(listAll, Has.Count.EqualTo(0));
+        });
+        _postStorageContract.Verify(x => x.GetList(),
+        Times.Exactly(2));
+    }
+    [Test]
+    public void GetAllPosts_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.GetAllPosts(),
+        Throws.TypeOf<NullListException>());
+        _postStorageContract.Verify(x => x.GetList(),
+        Times.Once);
+    }
+    [Test]
+    public void GetAllPosts_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _postStorageContract.Setup(x =>
+        x.GetList()).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.GetAllPosts(),
+        Throws.TypeOf<StorageException>());
+        _postStorageContract.Verify(x => x.GetList(),
+        Times.Once);
+    }
+    [Test]
+    public void GetAllDataOfPost_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var postId = Guid.NewGuid().ToString();
+        var listOriginal = new List<PostDataModel>()
+        {
+        new(postId, "name 1", PostType.SoftInstaller, 10),
+        new(postId, "name 2", PostType.SoftInstaller, 10)
+        };
+        _postStorageContract.Setup(x =>
+        x.GetPostWithHistory(It.IsAny<string>())).Returns(listOriginal);
+        //Act
+        var list = _postBusinessLogicContract.GetAllDataOfPost(postId);
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(2)); 
+        _postStorageContract.Verify(x => x.GetPostWithHistory(postId),
+        Times.Once);
+        }
+    [Test]
+    public void GetAllDataOfPost_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _postStorageContract.Setup(x =>
+        x.GetPostWithHistory(It.IsAny<string>())).Returns([]);
+        //Act
+        var list =
+        _postBusinessLogicContract.GetAllDataOfPost(Guid.NewGuid().ToString());
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _postStorageContract.Verify(x =>
+        x.GetPostWithHistory(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllDataOfPost_PostIdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _postBusinessLogicContract.GetAllDataOfPost(null),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _postBusinessLogicContract.GetAllDataOfPost(string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _postStorageContract.Verify(x =>
+        x.GetPostWithHistory(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetAllDataOfPost_PostIdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _postBusinessLogicContract.GetAllDataOfPost("id"),
+        Throws.TypeOf<ValidationException>());
+        _postStorageContract.Verify(x =>
+        x.GetPostWithHistory(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetAllDataOfPost_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.GetAllDataOfPost(Guid.NewGuid().ToString()),
+        Throws.TypeOf<NullListException>());
+        _postStorageContract.Verify(x =>
+        x.GetPostWithHistory(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllDataOfPost_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _postStorageContract.Setup(x =>
+        x.GetPostWithHistory(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert 
+        Assert.That(() =>
+        _postBusinessLogicContract.GetAllDataOfPost(Guid.NewGuid().ToString()),
+        Throws.TypeOf<StorageException>());
+        _postStorageContract.Verify(x =>
+        x.GetPostWithHistory(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetPostByData_GetById_ReturnRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var record = new PostDataModel(id, "name", PostType.SoftInstaller, 10);
+        _postStorageContract.Setup(x =>
+        x.GetElementById(id)).Returns(record);
+        //Act
+        var element = _postBusinessLogicContract.GetPostByData(id);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.Id, Is.EqualTo(id));
+        _postStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetPostByData_GetByName_ReturnRecord_Test()
+    {
+        //Arrange
+        var postName = "name";
+        var record = new PostDataModel(Guid.NewGuid().ToString(), postName,
+        PostType.SoftInstaller, 10);
+        _postStorageContract.Setup(x =>
+        x.GetElementByName(postName)).Returns(record);
+        //Act
+        var element = _postBusinessLogicContract.GetPostByData(postName);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.PostName, Is.EqualTo(postName));
+        _postStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetPostByData_EmptyData_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _postBusinessLogicContract.GetPostByData(null),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _postBusinessLogicContract.GetPostByData(string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _postStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Never);
+        _postStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetPostByData_GetById_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+    Assert.That(() =>
+    _postBusinessLogicContract.GetPostByData(Guid.NewGuid().ToString()),
+    Throws.TypeOf<ElementNotFoundException>());
+        _postStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Once);
+        _postStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetPostByData_GetByName_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _postBusinessLogicContract.GetPostByData("name"),
+        Throws.TypeOf<ElementNotFoundException>());
+        _postStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Never);
+        _postStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetPostByData_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _postStorageContract.Setup(x =>
+        x.GetElementById(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        _postStorageContract.Setup(x =>
+        x.GetElementByName(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.GetPostByData(Guid.NewGuid().ToString()),
+        Throws.TypeOf<StorageException>());
+        Assert.That(() => _postBusinessLogicContract.GetPostByData("name"),
+        Throws.TypeOf<StorageException>());
+        _postStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Once);
+        _postStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void InsertPost_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new PostDataModel(Guid.NewGuid().ToString(), "name",
+        PostType.Supervisor, 10);
+        _postStorageContract.Setup(x =>
+        x.AddElement(It.IsAny<PostDataModel>()))
+        .Callback((PostDataModel x) =>
+        {
+            flag = x.Id == record.Id && x.PostName ==
+    record.PostName && x.PostType == record.PostType && x.Salary == record.Salary;
+        });
+        //Act
+        _postBusinessLogicContract.InsertPost(record);
+        //Assert
+        _postStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<PostDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void InsertPost_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _postStorageContract.Setup(x =>
+        x.AddElement(It.IsAny<PostDataModel>())).Throws(new
+        ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.InsertPost(new(Guid.NewGuid().ToString(), "name",
+        PostType.Supervisor, 10)),
+        Throws.TypeOf<ElementExistsException>());
+        _postStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<PostDataModel>()), Times.Once);
+    }
+    [Test]
+    public void InsertPost_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _postBusinessLogicContract.InsertPost(null),
+        Throws.TypeOf<ArgumentNullException>());
+        _postStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<PostDataModel>()), Times.Never);
+    }
+    [Test]
+    public void InsertPost_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _postBusinessLogicContract.InsertPost(new
+        PostDataModel("id", "name", PostType.Supervisor, 10)),
+        Throws.TypeOf<ValidationException>());
+        _postStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<PostDataModel>()), Times.Never);
+    }
+    [Test]
+    public void InsertPost_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _postStorageContract.Setup(x =>
+        x.AddElement(It.IsAny<PostDataModel>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.InsertPost(new(Guid.NewGuid().ToString(), "name",
+        PostType.Supervisor, 10)),
+        Throws.TypeOf<StorageException>());
+        _postStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<PostDataModel>()), Times.Once);
+    }
+    [Test]
+    public void UpdatePost_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new PostDataModel(Guid.NewGuid().ToString(), "name",
+        PostType.Supervisor, 10);
+        _postStorageContract.Setup(x =>
+        x.UpdElement(It.IsAny<PostDataModel>()))
+    .Callback((PostDataModel x) =>
+    {
+        flag = x.Id == record.Id && x.PostName ==
+    record.PostName && x.PostType == record.PostType && x.Salary == record.Salary;
+    });
+        //Act
+        _postBusinessLogicContract.UpdatePost(record);
+        //Assert
+        _postStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<PostDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void UpdatePost_RecordWithIncorrectData_ThrowException_Test()
+    {
+        //Arrange
+        _postStorageContract.Setup(x =>
+        x.UpdElement(It.IsAny<PostDataModel>())).Throws(new
+        ElementNotFoundException(""));
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.UpdatePost(new(Guid.NewGuid().ToString(), "name",
+        PostType.Supervisor, 10)),
+        Throws.TypeOf<ElementNotFoundException>());
+        _postStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<PostDataModel>()), Times.Once);
+    }
+    [Test]
+    public void UpdatePost_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _postStorageContract.Setup(x =>
+        x.UpdElement(It.IsAny<PostDataModel>())).Throws(new
+        ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.UpdatePost(new(Guid.NewGuid().ToString(), "anme",
+        PostType.Supervisor, 10)),
+        Throws.TypeOf<ElementExistsException>());
+        _postStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<PostDataModel>()), Times.Once);
+    }
+    [Test]
+    public void UpdatePost_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _postBusinessLogicContract.UpdatePost(null),
+        Throws.TypeOf<ArgumentNullException>());
+        _postStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<PostDataModel>()), Times.Never);
+    }
+    [Test]
+    public void UpdatePost_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _postBusinessLogicContract.UpdatePost(new
+        PostDataModel("id", "name", PostType.Supervisor, 10)),
+        Throws.TypeOf<ValidationException>());
+    _postStorageContract.Verify(x =>
+    x.UpdElement(It.IsAny<PostDataModel>()), Times.Never);
+    }
+    [Test]
+    public void UpdatePost_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _postStorageContract.Setup(x =>
+        x.UpdElement(It.IsAny<PostDataModel>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.UpdatePost(new(Guid.NewGuid().ToString(), "name",
+        PostType.Supervisor, 10)),
+        Throws.TypeOf<StorageException>());
+        _postStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<PostDataModel>()), Times.Once);
+    }
+    [Test]
+    public void DeletePost_CorrectRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var flag = false;
+        _postStorageContract.Setup(x => x.DelElement(It.Is((string x) => x ==
+        id))).Callback(() => { flag = true; });
+        //Act
+        _postBusinessLogicContract.DeletePost(id);
+        //Assert
+        _postStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void DeletePost_RecordWithIncorrectId_ThrowException_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        _postStorageContract.Setup(x =>
+        x.DelElement(It.IsAny<string>())).Throws(new ElementNotFoundException(id));
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.DeletePost(Guid.NewGuid().ToString()),
+        Throws.TypeOf<ElementNotFoundException>());
+        _postStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Once);
+    }
+    [Test]
+    public void DeletePost_IdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _postBusinessLogicContract.DeletePost(null),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _postBusinessLogicContract.DeletePost(string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _postStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Never);
+    }
+[Test]
+    public void DeletePost_IdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _postBusinessLogicContract.DeletePost("id"),
+        Throws.TypeOf<ValidationException>());
+        _postStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Never);
+    }
+    [Test]
+    public void DeletePost_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _postStorageContract.Setup(x =>
+        x.DelElement(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.DeletePost(Guid.NewGuid().ToString()),
+        Throws.TypeOf<StorageException>());
+        _postStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Once);
+    }
+    [Test]
+    public void RestorePost_CorrectRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var flag = false;
+        _postStorageContract.Setup(x => x.ResElement(It.Is((string x) => x ==
+        id))).Callback(() => { flag = true; });
+        //Act
+        _postBusinessLogicContract.RestorePost(id);
+        //Assert
+        _postStorageContract.Verify(x => x.ResElement(It.IsAny<string>()),
+        Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void RestorePost_RecordWithIncorrectId_ThrowException_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        _postStorageContract.Setup(x =>
+        x.ResElement(It.IsAny<string>())).Throws(new ElementNotFoundException(id));
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.RestorePost(Guid.NewGuid().ToString()),
+        Throws.TypeOf<ElementNotFoundException>());
+        _postStorageContract.Verify(x => x.ResElement(It.IsAny<string>()),
+        Times.Once);
+    }
+    [Test]
+    public void RestorePost_IdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _postBusinessLogicContract.RestorePost(null),
+        Throws.TypeOf<ArgumentNullException>());
+    Assert.That(() =>
+    _postBusinessLogicContract.RestorePost(string.Empty),
+    Throws.TypeOf<ArgumentNullException>());
+        _postStorageContract.Verify(x => x.ResElement(It.IsAny<string>()),
+        Times.Never);
+    }
+    [Test]
+    public void RestorePost_IdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _postBusinessLogicContract.RestorePost("id"),
+        Throws.TypeOf<ValidationException>());
+        _postStorageContract.Verify(x => x.ResElement(It.IsAny<string>()),
+        Times.Never);
+    }
+    [Test]
+    public void RestorePost_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _postStorageContract.Setup(x =>
+        x.ResElement(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.RestorePost(Guid.NewGuid().ToString()),
+        Throws.TypeOf<StorageException>());
+        _postStorageContract.Verify(x => x.ResElement(It.IsAny<string>()),
+        Times.Once);
+    }
+}
+

SmallSoftwareProject/SmallSoftwareTests/BusinessLogicsContractsTests/RequestBusinessLogicContractTests.cs

@@ -0,0 +1,535 @@
+using Microsoft.Extensions.Logging;
+using Moq;
+using SmallSoftwareBusinessLogic.Implementations;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.StoragesContracts;
+
+
+namespace SmallSoftwareTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+internal class RequestBusinessLogicContractTests
+{
+    private RequestBusinessLogicContract _requestBusinessLogicContract;
+    private Mock<IRequestStorageContract> _requestStorageContract;
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+
+    {
+    _requestStorageContract = new Mock<IRequestStorageContract>();
+    _requestBusinessLogicContract = new
+    RequestBusinessLogicContract(_requestStorageContract.Object, new
+    Mock<ILogger>().Object);
+    }
+    [SetUp]
+    public void SetUp()
+    {
+        _requestStorageContract.Reset();
+    }
+    [Test]
+    public void GetAllRequestsByPeriod_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        var listOriginal = new List<RequestDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "test@mail.ru", false, [new InstallationRequestDataModel(Guid.NewGuid().ToString(),Guid.NewGuid().ToString(), 5, 10)], DateTime.UtcNow),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "test@mail.ru",  false, [], DateTime.UtcNow), new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "test@mail.ru", false, [], DateTime.UtcNow),
+        };
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>())).Returns(listOriginal);
+        //Act
+        var list = _requestBusinessLogicContract.GetAllRequestsByPeriod(date,
+        date.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+        _requestStorageContract.Verify(x => x.GetList(date, date.AddDays(1), null, null), Times.Once);
+    }
+    [Test]
+    public void GetAllRequestsByPeriod_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(),
+        It.IsAny<string>())).Returns([]);
+        //Act
+        var list =
+        _requestBusinessLogicContract.GetAllRequestsByPeriod(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllRequestsByPeriod_IncorrectDates_ThrowException_Test()
+    { 
+    //Arrange
+    var date = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsByPeriod(date, date),
+        Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsByPeriod(date, date.AddSeconds(-1)),
+        Throws.TypeOf<IncorrectDatesException>());
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetAllRequestsByPeriod_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsByPeriod(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1)), Throws.TypeOf<NullListException>());
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllRequestsByPeriod_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsByPeriod(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1)), Throws.TypeOf<StorageException>());
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllRequestsByWorkerByPeriod_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        var workerId = Guid.NewGuid().ToString();
+        var listOriginal = new List<RequestDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), false, [new InstallationRequestDataModel(Guid.NewGuid().ToString(),Guid.NewGuid().ToString(), 5, 10)], DateTime.UtcNow),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), false, [], DateTime.UtcNow), new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), false, [], DateTime.UtcNow),
+        };
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>())).Returns(listOriginal);
+        //Act 
+        var list =
+       _requestBusinessLogicContract.GetAllRequestsByWorkerByPeriod(workerId, date,
+        date.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+        _requestStorageContract.Verify(x => x.GetList(date, date.AddDays(1),
+        workerId, null), Times.Once);
+    }
+    [Test]
+    public void GetAllRequestsByWorkerByPeriod_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>())).Returns([]);
+        //Act
+        var list =
+        _requestBusinessLogicContract.GetAllRequestsByWorkerByPeriod(Guid.NewGuid().ToString(),
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetAllRequestsByWorkerByPeriod_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsByWorkerByPeriod(Guid.NewGuid().ToString(),
+        date, date), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsByWorkerByPeriod(Guid.NewGuid().ToString(),
+        date, date.AddSeconds(-1)), Throws.TypeOf<IncorrectDatesException>());
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void
+    GetAllRequestsByWorkerByPeriod_WorkerIdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsByWorkerByPeriod(null, DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1)), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsByWorkerByPeriod(string.Empty,
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<ArgumentNullException>());
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetAllRequestsByWorkerByPeriod_WorkerIdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsByWorkerByPeriod("workerId",
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<ValidationException>());
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetAllRequestsByWorkerByPeriod_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsByWorkerByPeriod(Guid.NewGuid().ToString(),
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<NullListException>());
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetAllRequestsByWorkerByPeriod_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsByWorkerByPeriod(Guid.NewGuid().ToString(),
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1)), Throws.TypeOf<StorageException>());
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>()), Times.Once);
+    }
+    
+    [Test]
+    public void GetAllRequestsBySoftwareByPeriod_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        var softwareId = Guid.NewGuid().ToString();
+        var listOriginal = new List<RequestDataModel>()
+        {
+        new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "test@mail.ru", false, [new InstallationRequestDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 5, 10)], DateTime.UtcNow),
+        new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "test@mail.ru", false, [], DateTime.UtcNow),
+        new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "test@mail.ru", false, [], DateTime.UtcNow),
+        };
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>())).Returns(listOriginal);
+        //Act
+        var list =
+        _requestBusinessLogicContract.GetAllRequestsBySoftwareByPeriod(softwareId, date,
+        date.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+        _requestStorageContract.Verify(x => x.GetList(date, date.AddDays(1), null, softwareId), Times.Once);
+    }
+    [Test]
+    public void GetAllRequestsBySoftwareByPeriod_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>())).Returns([]);
+        //Act
+        var list =
+        _requestBusinessLogicContract.GetAllRequestsBySoftwareByPeriod(Guid.NewGuid().ToString()
+        , DateTime.UtcNow, DateTime.UtcNow.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetAllRequestsBySoftwareByPeriod_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsBySoftwareByPeriod(Guid.NewGuid().ToString()
+        , date, date), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsBySoftwareByPeriod(Guid.NewGuid().ToString()
+        , date, date.AddSeconds(-1)), Throws.TypeOf<IncorrectDatesException>());
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void
+    GetAllRequestsBySoftwareByPeriod_SoftwareIdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsBySoftwareByPeriod(null, DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1)), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsBySoftwareByPeriod(string.Empty, DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<ArgumentNullException>());
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void
+    GetAllRequestsBySoftwareByPeriod_SoftwareIdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsBySoftwareByPeriod("softwareId",
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<ValidationException>());
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetAllRequestsBySoftwareByPeriod_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsBySoftwareByPeriod(Guid.NewGuid().ToString()
+        , DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<NullListException>());
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetAllRequestsBySoftwareByPeriod_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetAllRequestsBySoftwareByPeriod(Guid.NewGuid().ToString()
+        , DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<StorageException>());
+        _requestStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), 
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetRequestByData_GetById_ReturnRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var record = new RequestDataModel(id, Guid.NewGuid().ToString(), "test@mail.ru", false, [new InstallationRequestDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 5, 10)], DateTime.UtcNow);
+        _requestStorageContract.Setup(x =>
+        x.GetElementById(id)).Returns(record); 
+    //Act
+    var element = _requestBusinessLogicContract.GetRequestByData(id);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.Id, Is.EqualTo(id));
+        _requestStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetRequestByData_EmptyData_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _requestBusinessLogicContract.GetRequestByData(null),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetRequestByData(string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _requestStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetRequestByData_IdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _requestBusinessLogicContract.GetRequestByData("requestId"),
+        Throws.TypeOf<ValidationException>());
+        _requestStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetRequestByData_GetById_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetRequestByData(Guid.NewGuid().ToString()),
+        Throws.TypeOf<ElementNotFoundException>());
+        _requestStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetRequestByData_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _requestStorageContract.Setup(x =>
+        x.GetElementById(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.GetRequestByData(Guid.NewGuid().ToString()),
+        Throws.TypeOf<StorageException>());
+        _requestStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void InsertRequest_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false; 
+        var record = new RequestDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "valid.email@example.com", false, 
+            [new InstallationRequestDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 5, 10)], DateTime.UtcNow);
+        _requestStorageContract.Setup(x => x.AddElement(It.IsAny<RequestDataModel>()))
+        .Callback((RequestDataModel x) =>
+        {
+            flag = x.Id == record.Id && x.WorkerId == record.WorkerId && x.IsCancel ==
+            record.IsCancel && x.Softwares.Count == record.Softwares.Count &&
+            x.Softwares.First().SoftwareId ==
+            record.Softwares.First().SoftwareId &&
+            x.Softwares.First().RequestId ==
+            record.Softwares.First().RequestId &&
+            x.Softwares.First().Count ==
+            record.Softwares.First().Count;
+        });
+        //Act
+        _requestBusinessLogicContract.InsertRequest(record);
+        //Assert
+        _requestStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<RequestDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void InsertRequest_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _requestStorageContract.Setup(x =>
+        x.AddElement(It.IsAny<RequestDataModel>())).Throws(new
+        ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.InsertRequest(new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "test@example.com", false, 
+        [new InstallationRequestDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 5, 10)], DateTime.UtcNow)), Throws.TypeOf<ElementExistsException>());
+        _requestStorageContract.Verify(x => x.AddElement(It.IsAny<RequestDataModel>()), Times.Once);
+    }
+    [Test]
+    public void InsertRequest_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _requestBusinessLogicContract.InsertRequest(null),
+        Throws.TypeOf<ArgumentNullException>());
+        _requestStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<RequestDataModel>()), Times.Never);
+    }
+    [Test]
+    public void InsertRequest_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _requestBusinessLogicContract.InsertRequest(new RequestDataModel("id", Guid.NewGuid().ToString(), "test@mail.ru", false, [], DateTime.UtcNow)), Throws.TypeOf<ValidationException>());
+    _requestStorageContract.Verify(x =>
+    x.AddElement(It.IsAny<RequestDataModel>()), Times.Never);
+    }
+    [Test]
+    public void InsertRequest_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _requestStorageContract.Setup(x =>
+        x.AddElement(It.IsAny<RequestDataModel>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.InsertRequest(new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "test@example.com", false, [new InstallationRequestDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 5, 10)], DateTime.UtcNow)), Throws.TypeOf<StorageException>());
+        _requestStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<RequestDataModel>()), Times.Once);
+    }
+    [Test]
+    public void CancelRequest_CorrectRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var flag = false;
+        _requestStorageContract.Setup(x => x.DelElement(It.Is((string x) => x ==
+        id))).Callback(() => { flag = true; });
+        //Act
+        _requestBusinessLogicContract.CancelRequest(id);
+        //Assert
+        _requestStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void CancelRequest_RecordWithIncorrectId_ThrowException_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        _requestStorageContract.Setup(x =>
+        x.DelElement(It.IsAny<string>())).Throws(new ElementNotFoundException(id));
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.CancelRequest(Guid.NewGuid().ToString()),
+        Throws.TypeOf<ElementNotFoundException>());
+        _requestStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Once);
+    }
+    [Test]
+    public void CancelRequest_IdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _requestBusinessLogicContract.CancelRequest(null),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _requestBusinessLogicContract.CancelRequest(string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _requestStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Never); 
+    }
+    [Test]
+    public void CancelRequest_IdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _requestBusinessLogicContract.CancelRequest("id"),
+        Throws.TypeOf<ValidationException>());
+        _requestStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Never);
+    }
+    [Test]
+    public void CancelRequest_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _requestStorageContract.Setup(x =>
+        x.DelElement(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _requestBusinessLogicContract.CancelRequest(Guid.NewGuid().ToString()),
+        Throws.TypeOf<StorageException>());
+        _requestStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Once);
+    }
+}

SmallSoftwareProject/SmallSoftwareTests/BusinessLogicsContractsTests/SalaryBusinessLogicContractTests.cs

@@ -0,0 +1,430 @@
+using Microsoft.Extensions.Logging;
+using Moq;
+using SmallSoftwareBusinessLogic.Implementations;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Enums;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.StoragesContracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+internal class SalaryBusinessLogicContractTests
+{
+    private SalaryBusinessLogicContract _salaryBusinessLogicContract;
+    private Mock<ISalaryStorageContract> _salaryStorageContract;
+    private Mock<IRequestStorageContract> _requestStorageContract;
+    private Mock<IPostStorageContract> _postStorageContract;
+    private Mock<IWorkerStorageContract> _workerStorageContract;
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        _salaryStorageContract = new Mock<ISalaryStorageContract>();
+        _requestStorageContract = new Mock<IRequestStorageContract>();
+        _postStorageContract = new Mock<IPostStorageContract>();
+        _workerStorageContract = new Mock<IWorkerStorageContract>();
+        _salaryBusinessLogicContract = new
+        SalaryBusinessLogicContract(_salaryStorageContract.Object,
+        _requestStorageContract.Object, _postStorageContract.Object,
+        _workerStorageContract.Object, new Mock<ILogger>().Object);
+    }
+    [SetUp]
+    public void SetUp()
+    {
+        _salaryStorageContract.Reset();
+        _requestStorageContract.Reset();
+        _postStorageContract.Reset();
+        _workerStorageContract.Reset();
+    }
+    [Test]
+    public void GetAllSalaries_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var startDate = DateTime.UtcNow;
+        var endDate = DateTime.UtcNow.AddDays(1);
+        var listOriginal = new List<SalaryDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), DateTime.UtcNow, 10),
+            new(Guid.NewGuid().ToString(), DateTime.UtcNow.AddDays(1),
+            14),
+            new(Guid.NewGuid().ToString(), DateTime.UtcNow.AddDays(-1),
+            30),
+        };
+        _salaryStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>())).Returns(listOriginal);
+        //Act
+        var list =
+        _salaryBusinessLogicContract.GetAllSalariesByPeriod(startDate, endDate);
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+        _salaryStorageContract.Verify(x => x.GetList(startDate, endDate,
+        null), Times.Once);
+    }
+    [Test] 
+    public void GetAllSalaries_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _salaryStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>())).Returns([]);
+        //Act
+        var list =
+        _salaryBusinessLogicContract.GetAllSalariesByPeriod(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllSalaries_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var dateTime = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() =>
+        _salaryBusinessLogicContract.GetAllSalariesByPeriod(dateTime, dateTime),
+        Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() =>
+        _salaryBusinessLogicContract.GetAllSalariesByPeriod(dateTime,
+        dateTime.AddSeconds(-1)), Throws.TypeOf<IncorrectDatesException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetAllSalaries_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _salaryBusinessLogicContract.GetAllSalariesByPeriod(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1)), Throws.TypeOf<NullListException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllSalaries_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _salaryStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _salaryBusinessLogicContract.GetAllSalariesByPeriod(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1)), Throws.TypeOf<StorageException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllSalariesByWorker_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var startDate = DateTime.UtcNow;
+        var endDate = DateTime.UtcNow.AddDays(1); 
+        var workerId = Guid.NewGuid().ToString();
+        var listOriginal = new List<SalaryDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), DateTime.UtcNow, 10),
+            new(Guid.NewGuid().ToString(), DateTime.UtcNow.AddDays(1),
+            14),
+            new(Guid.NewGuid().ToString(), DateTime.UtcNow.AddDays(-1),
+            30),
+        };
+        _salaryStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>())).Returns(listOriginal);
+        //Act
+        var list =
+        _salaryBusinessLogicContract.GetAllSalariesByPeriodByWorker(startDate, endDate,
+        workerId);
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+        _salaryStorageContract.Verify(x => x.GetList(startDate, endDate,
+        workerId), Times.Once);
+    }
+    [Test]
+    public void GetAllSalariesByWorker_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _salaryStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>())).Returns([]);
+        //Act
+        var list =
+        _salaryBusinessLogicContract.GetAllSalariesByPeriodByWorker(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1), Guid.NewGuid().ToString());
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllSalariesByWorker_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var dateTime = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() =>
+        _salaryBusinessLogicContract.GetAllSalariesByPeriodByWorker(dateTime, dateTime,
+        Guid.NewGuid().ToString()), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() =>
+        _salaryBusinessLogicContract.GetAllSalariesByPeriodByWorker(dateTime,
+        dateTime.AddSeconds(-1), Guid.NewGuid().ToString()),
+        Throws.TypeOf<IncorrectDatesException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void
+    GetAllSalariesByWorker_WorkerIdIsNUllOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _salaryBusinessLogicContract.GetAllSalariesByPeriodByWorker(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1), null), Throws.TypeOf<ArgumentNullException>()); 
+        Assert.That(() =>
+        _salaryBusinessLogicContract.GetAllSalariesByPeriodByWorker(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1), string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetAllSalariesByWorker_WorkerIdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _salaryBusinessLogicContract.GetAllSalariesByPeriodByWorker(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1), "workerId"), Throws.TypeOf<ValidationException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetAllSalariesByWorker_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _salaryBusinessLogicContract.GetAllSalariesByPeriodByWorker(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1), Guid.NewGuid().ToString()),
+        Throws.TypeOf<NullListException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllSalariesByWorker_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _salaryStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _salaryBusinessLogicContract.GetAllSalariesByPeriodByWorker(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1), Guid.NewGuid().ToString()),
+        Throws.TypeOf<StorageException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void CalculateSalaryByMounth_WithSeveralWorkers_Test()
+    {
+        //Arrange
+        var worker1Id = Guid.NewGuid().ToString();
+        var worker2Id = Guid.NewGuid().ToString();
+        var worker3Id = Guid.NewGuid().ToString();
+        var list = new List<WorkerDataModel>() {
+            new(worker1Id, "Test", Guid.NewGuid().ToString(),
+            DateTime.UtcNow, DateTime.UtcNow, false),
+            new(worker2Id, "Test", Guid.NewGuid().ToString(),
+            DateTime.UtcNow, DateTime.UtcNow, false),
+            new(worker3Id, "Test", Guid.NewGuid().ToString(),
+            DateTime.UtcNow, DateTime.UtcNow, false)
+        };  
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>(), It.IsAny<string>()))
+        .Returns([new RequestDataModel(Guid.NewGuid().ToString(),
+            worker1Id, Guid.NewGuid().ToString(),  false, [], DateTime.UtcNow),
+            new RequestDataModel(Guid.NewGuid().ToString(), worker1Id, Guid.NewGuid().ToString(),
+            false, [], DateTime.UtcNow),
+            new RequestDataModel(Guid.NewGuid().ToString(), worker2Id, Guid.NewGuid().ToString(),
+             false, [], DateTime.UtcNow),
+            new RequestDataModel(Guid.NewGuid().ToString(), worker3Id, Guid.NewGuid().ToString(),
+             false, [], DateTime.UtcNow),
+            new RequestDataModel(Guid.NewGuid().ToString(), worker3Id, Guid.NewGuid().ToString(),
+            false, [], DateTime.UtcNow)]);
+        _postStorageContract.Setup(x => x.GetElementById(It.IsAny<string>()))
+        .Returns(new PostDataModel(Guid.NewGuid().ToString(), "name",
+        PostType.SoftInstaller, 2000));
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()))
+        .Returns(list);
+        //Act
+        _salaryBusinessLogicContract.CalculateSalaryByMonth(DateTime.UtcNow);
+        //Assert
+        _salaryStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<SalaryDataModel>()), Times.Exactly(list.Count));
+    }
+    [Test] 
+    public void CalculateSalaryByMounth_WithoitRequestsByWorker_Test()
+    {
+        //Arrange
+        var postSalary = 2000.0;
+        var workerId = Guid.NewGuid().ToString();
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>(), It.IsAny<string>()))
+        .Returns([]);
+        _postStorageContract.Setup(x => x.GetElementById(It.IsAny<string>()))
+        .Returns(new PostDataModel(Guid.NewGuid().ToString(), "name",
+        PostType.SoftInstaller, postSalary));
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()))
+        .Returns([new WorkerDataModel(workerId, "Test",
+Guid.NewGuid().ToString(), DateTime.UtcNow, DateTime.UtcNow, false)]);
+        var sum = 0.0;
+        var expectedSum = postSalary;
+        _salaryStorageContract.Setup(x =>
+        x.AddElement(It.IsAny<SalaryDataModel>()))
+        .Callback((SalaryDataModel x) =>
+        {
+            sum = x.Salary;
+        });
+        //Act
+        _salaryBusinessLogicContract.CalculateSalaryByMonth(DateTime.UtcNow);
+        //Assert
+        Assert.That(sum, Is.EqualTo(expectedSum));
+    }
+    [Test]
+    public void
+    CalculateSalaryByMounth_RequestStorageReturnNull_ThrowException_Test()
+    {
+        //Arrange
+        var workerId = Guid.NewGuid().ToString();
+        _postStorageContract.Setup(x => x.GetElementById(It.IsAny<string>()))
+        .Returns(new PostDataModel(Guid.NewGuid().ToString(), "name",
+        PostType.SoftInstaller, 2000));
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()))
+        .Returns([new WorkerDataModel(workerId, "Test",
+Guid.NewGuid().ToString(), DateTime.UtcNow, DateTime.UtcNow, false)]);
+        //Act&Assert
+        Assert.That(() =>
+        _salaryBusinessLogicContract.CalculateSalaryByMonth(DateTime.UtcNow),
+        Throws.TypeOf<NullListException>());
+    }
+    [Test]
+    public void
+    CalculateSalaryByMounth_PostStorageReturnNull_ThrowException_Test()
+    {
+        //Arrange
+        var workerId = Guid.NewGuid().ToString();
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>(), It.IsAny<string>()))
+        .Returns([new RequestDataModel(Guid.NewGuid().ToString(), workerId, Guid.NewGuid().ToString(), false, [], DateTime.UtcNow)]); 
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()))
+        .Returns([new WorkerDataModel(workerId, "Test",
+        Guid.NewGuid().ToString(), DateTime.UtcNow, DateTime.UtcNow, false)]);
+        //Act&Assert
+        Assert.That(() =>
+        _salaryBusinessLogicContract.CalculateSalaryByMonth(DateTime.UtcNow),
+        Throws.TypeOf<NullListException>());
+    }
+    [Test]
+    public void
+    CalculateSalaryByMounth_WorkerStorageReturnNull_ThrowException_Test()
+    {
+        //Arrange
+        var workerId = Guid.NewGuid().ToString();
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>(), It.IsAny<string>()))
+        .Returns([new RequestDataModel(Guid.NewGuid().ToString(),
+        workerId, Guid.NewGuid().ToString(), false, [], DateTime.UtcNow)]);
+        _postStorageContract.Setup(x => x.GetElementById(It.IsAny<string>()))
+        .Returns(new PostDataModel(Guid.NewGuid().ToString(), "name",
+        PostType.SoftInstaller, 2000));
+        //Act&Assert
+        Assert.That(() =>
+        _salaryBusinessLogicContract.CalculateSalaryByMonth(DateTime.UtcNow),
+        Throws.TypeOf<NullListException>());
+    }
+    [Test]
+    public void
+    CalculateSalaryByMounth_RequestStorageThrowException_ThrowException_Test()
+    {
+        //Arrange
+        var workerId = Guid.NewGuid().ToString();
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>(), It.IsAny<string>()))
+        .Throws(new StorageException(new
+        InvalidOperationException()));
+        _postStorageContract.Setup(x => x.GetElementById(It.IsAny<string>()))
+        .Returns(new PostDataModel(Guid.NewGuid().ToString(), "name",
+        PostType.SoftInstaller, 2000));
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()))
+        .Returns([new WorkerDataModel(workerId, "Test",
+Guid.NewGuid().ToString(), DateTime.UtcNow, DateTime.UtcNow, false)]);
+        //Act&Assert
+        Assert.That(() =>
+        _salaryBusinessLogicContract.CalculateSalaryByMonth(DateTime.UtcNow),
+        Throws.TypeOf<StorageException>());
+    }
+    [Test]
+    public void
+    CalculateSalaryByMounth_PostStorageThrowException_ThrowException_Test()
+    {
+        //Arrange
+        var workerId = Guid.NewGuid().ToString(); 
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>(), It.IsAny<string>()))
+        .Returns([new RequestDataModel(Guid.NewGuid().ToString(),
+        workerId, Guid.NewGuid().ToString(), false, [], DateTime.UtcNow)]);
+        _postStorageContract.Setup(x => x.GetElementById(It.IsAny<string>()))
+        .Throws(new StorageException(new
+        InvalidOperationException()));
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()))
+        .Returns([new WorkerDataModel(workerId, "Test",
+Guid.NewGuid().ToString(), DateTime.UtcNow, DateTime.UtcNow, false)]);
+        //Act&Assert
+        Assert.That(() =>
+        _salaryBusinessLogicContract.CalculateSalaryByMonth(DateTime.UtcNow),
+        Throws.TypeOf<StorageException>());
+    }
+    [Test]
+    public void
+    CalculateSalaryByMounth_WorkerStorageThrowException_ThrowException_Test()
+    {
+        //Arrange
+        var workerId = Guid.NewGuid().ToString();
+        _requestStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(),
+        It.IsAny<DateTime>(), It.IsAny<string>(), It.IsAny<string>()))
+        .Returns([new RequestDataModel(Guid.NewGuid().ToString(), workerId, Guid.NewGuid().ToString(), false, [], DateTime.UtcNow)]);
+        _postStorageContract.Setup(x => x.GetElementById(It.IsAny<string>()))
+        .Returns(new PostDataModel(Guid.NewGuid().ToString(), "name",
+        PostType.SoftInstaller, 2000));
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()))
+        .Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _salaryBusinessLogicContract.CalculateSalaryByMonth(DateTime.UtcNow),
+        Throws.TypeOf<StorageException>());
+    }
+}
+

SmallSoftwareProject/SmallSoftwareTests/BusinessLogicsContractsTests/SoftwareBusinessLogicContractTests.cs

@@ -0,0 +1,620 @@
+using Microsoft.Extensions.Logging;
+using Moq;
+using SmallSoftwareBusinessLogic.Implementations;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Enums;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.StoragesContracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using static NUnit.Framework.Internal.OSPlatform;
+
+namespace SmallSoftwareTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+internal class SoftwareBusinessLogicContractTests
+{
+    private SoftwareBusinessLogicContract _softwareBusinessLogicContract;
+    private Mock<ISoftwareStorageContract> _softwareStorageContract;
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        _softwareStorageContract = new Mock<ISoftwareStorageContract>();
+        _softwareBusinessLogicContract = new
+        SoftwareBusinessLogicContract(_softwareStorageContract.Object, new
+        Mock<ILogger>().Object);
+    }
+    [SetUp]
+    public void SetUp()
+    {
+        _softwareStorageContract.Reset();
+    } 
+    [Test]
+    public void GetAllSoftwares_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var listOriginal = new List<SoftwareDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), "name 1", SoftwareType.Windows, Guid.NewGuid().ToString(), 10, false),
+            new(Guid.NewGuid().ToString(), "name 2", SoftwareType.Windows, Guid.NewGuid().ToString(), 10, true),
+            new(Guid.NewGuid().ToString(), "name 3", SoftwareType.Windows, Guid.NewGuid().ToString(), 10, false),
+        };
+        _softwareStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>())).Returns(listOriginal);
+        //Act
+        var listOnlyActive =
+        _softwareBusinessLogicContract.GetAllSoftwares(true);
+        var list = _softwareBusinessLogicContract.GetAllSoftwares(false);
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null);
+            Assert.That(list, Is.Not.Null);
+            Assert.That(listOnlyActive, Is.EquivalentTo(listOriginal));
+            Assert.That(list, Is.EquivalentTo(listOriginal));
+        });
+        _softwareStorageContract.Verify(x => x.GetList(true, null),
+        Times.Once);
+        _softwareStorageContract.Verify(x => x.GetList(false, null),
+        Times.Once);
+    }
+    [Test]
+    public void GetAllSoftwares_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _softwareStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>())).Returns([]);
+        //Act
+        var listOnlyActive =
+        _softwareBusinessLogicContract.GetAllSoftwares(true);
+        var list = _softwareBusinessLogicContract.GetAllSoftwares(false);
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null);
+            Assert.That(list, Is.Not.Null);
+            Assert.That(listOnlyActive, Has.Count.EqualTo(0));
+            Assert.That(list, Has.Count.EqualTo(0));
+        });
+        _softwareStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        null), Times.Exactly(2));
+    }
+    [Test]
+    public void GetAllSoftwares_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetAllSoftwares(It.IsAny<bool>()),
+        Throws.TypeOf<NullListException>()); 
+        _softwareStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllSoftwares_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _softwareStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetAllSoftwares(It.IsAny<bool>()),
+        Throws.TypeOf<StorageException>());
+        _softwareStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllSoftwaresByManufacturer_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var manufacturerId = Guid.NewGuid().ToString();
+        var listOriginal = new List<SoftwareDataModel>()
+        {
+        new(Guid.NewGuid().ToString(), "name 1",SoftwareType.Windows,
+        Guid.NewGuid().ToString(), 10, false),
+        new(Guid.NewGuid().ToString(), "name 2",
+        SoftwareType.Windows, Guid.NewGuid().ToString(), 10, true),
+        new(Guid.NewGuid().ToString(), "name 3",
+        SoftwareType.Windows, Guid.NewGuid().ToString(), 10, false),
+        };
+        _softwareStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>())).Returns(listOriginal);
+        //Act
+        var listOnlyActive =
+        _softwareBusinessLogicContract.GetAllSoftwaresByManufacturer(manufacturerId, true);
+        var list =
+        _softwareBusinessLogicContract.GetAllSoftwaresByManufacturer(manufacturerId,
+        false);
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null);
+            Assert.That(list, Is.Not.Null);
+            Assert.That(listOnlyActive, Is.EquivalentTo(listOriginal));
+            Assert.That(list, Is.EquivalentTo(listOriginal));
+        });
+        _softwareStorageContract.Verify(x => x.GetList(true, manufacturerId),
+        Times.Once);
+        _softwareStorageContract.Verify(x => x.GetList(false, manufacturerId),
+        Times.Once);
+    }
+    [Test]
+    public void GetAllSoftwaresByManufacturer_ReturnEmptyList_Test()
+    {
+        //Arrange
+        var manufacturerId = Guid.NewGuid().ToString();
+        _softwareStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>())).Returns([]);
+        //Act 
+        var listOnlyActive =
+        _softwareBusinessLogicContract.GetAllSoftwaresByManufacturer(manufacturerId, true);
+        var list =
+        _softwareBusinessLogicContract.GetAllSoftwaresByManufacturer(manufacturerId,
+        false);
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null);
+            Assert.That(list, Is.Not.Null);
+            Assert.That(listOnlyActive, Has.Count.EqualTo(0));
+            Assert.That(list, Has.Count.EqualTo(0));
+        });
+        _softwareStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        manufacturerId), Times.Exactly(2));
+    }
+    [Test]
+    public void
+    GetAllSoftwaresByManufacturer_ManufacturerIdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetAllSoftwaresByManufacturer(null,
+        It.IsAny<bool>()), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetAllSoftwaresByManufacturer(string.Empty,
+        It.IsAny<bool>()), Throws.TypeOf<ArgumentNullException>());
+        _softwareStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void
+    GetAllSoftwaresByManufacturer_ManufacturerIdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetAllSoftwaresByManufacturer("manufacturerId",
+        It.IsAny<bool>()), Throws.TypeOf<ValidationException>());
+        _softwareStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetAllSoftwaresByManufacturer_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetAllSoftwaresByManufacturer(Guid.NewGuid().ToString(), It.IsAny<bool>()), Throws.TypeOf<NullListException>());
+        _softwareStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetAllSoftwaresByManufacturer_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _softwareStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert 
+    Assert.That(() =>
+    _softwareBusinessLogicContract.GetAllSoftwaresByManufacturer(Guid.NewGuid().ToString(), It.IsAny<bool>()), Throws.TypeOf<StorageException>());
+        _softwareStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetSoftwareHistoryBySoftware_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var softwareId = Guid.NewGuid().ToString();
+        var listOriginal = new List<SoftwareHistoryDataModel>()
+{
+new(Guid.NewGuid().ToString(), 10),
+new(Guid.NewGuid().ToString(), 15),
+new(Guid.NewGuid().ToString(), 10),
+};
+        _softwareStorageContract.Setup(x =>
+        x.GetHistoryBySoftwareId(It.IsAny<string>())).Returns(listOriginal);
+        //Act
+        var list =
+        _softwareBusinessLogicContract.GetSoftwareHistoryBySoftware(softwareId);
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+        _softwareStorageContract.Verify(x =>
+        x.GetHistoryBySoftwareId(softwareId), Times.Once);
+    }
+    [Test]
+    public void GetSoftwareHistoryBySoftware_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _softwareStorageContract.Setup(x =>
+        x.GetHistoryBySoftwareId(It.IsAny<string>())).Returns([]);
+        //Act
+        var list =
+        _softwareBusinessLogicContract.GetSoftwareHistoryBySoftware(Guid.NewGuid().ToString(
+        ));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _softwareStorageContract.Verify(x =>
+        x.GetHistoryBySoftwareId(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetSoftwareHistoryBySoftware_SoftwareIdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetSoftwareHistoryBySoftware(null),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetSoftwareHistoryBySoftware(string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _softwareStorageContract.Verify(x =>
+        x.GetHistoryBySoftwareId(It.IsAny<string>()), Times.Never);
+    }
+    [Test] 
+    public void
+    GetSoftwareHistoryBySoftware_SoftwareIdIsNotGuid_ThrowException_Test()
+        {
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetSoftwareHistoryBySoftware("softwareId"),
+        Throws.TypeOf<ValidationException>());
+        _softwareStorageContract.Verify(x =>
+        x.GetHistoryBySoftwareId(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetSoftwareHistoryBySoftware_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetSoftwareHistoryBySoftware(Guid.NewGuid().ToString(
+        )), Throws.TypeOf<NullListException>());
+        _softwareStorageContract.Verify(x =>
+        x.GetHistoryBySoftwareId(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetSoftwareHistoryBySoftware_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _softwareStorageContract.Setup(x =>
+        x.GetHistoryBySoftwareId(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetSoftwareHistoryBySoftware(Guid.NewGuid().ToString(
+        )), Throws.TypeOf<StorageException>());
+        _softwareStorageContract.Verify(x =>
+        x.GetHistoryBySoftwareId(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetSoftwareByData_GetById_ReturnRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var record = new SoftwareDataModel(id, "name", SoftwareType.Windows,
+        Guid.NewGuid().ToString(), 10, false);
+        _softwareStorageContract.Setup(x =>
+        x.GetElementById(id)).Returns(record);
+        //Act
+        var element = _softwareBusinessLogicContract.GetSoftwareByData(id);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.Id, Is.EqualTo(id));
+        _softwareStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetSoftwareByData_GetByName_ReturnRecord_Test()
+    {
+        //Arrange
+        var name = "name";
+        var record = new SoftwareDataModel(Guid.NewGuid().ToString(), name,
+        SoftwareType.Windows, Guid.NewGuid().ToString(), 10, false); 
+        _softwareStorageContract.Setup(x =>
+        x.GetElementByName(name)).Returns(record);
+        //Act
+        var element = _softwareBusinessLogicContract.GetSoftwareByData(name);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.SoftwareName, Is.EqualTo(name));
+        _softwareStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetSoftwareByData_EmptyData_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetSoftwareByData(null),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetSoftwareByData(string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _softwareStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Never);
+        _softwareStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetSoftwareByData_GetById_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetSoftwareByData(Guid.NewGuid().ToString()),
+        Throws.TypeOf<ElementNotFoundException>());
+        _softwareStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetSoftwareByData_GetByName_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetSoftwareByData("name"),
+        Throws.TypeOf<ElementNotFoundException>());
+        _softwareStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetSoftwareByData_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _softwareStorageContract.Setup(x =>
+        x.GetElementById(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        _softwareStorageContract.Setup(x =>
+        x.GetElementByName(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetSoftwareByData(Guid.NewGuid().ToString()),
+        Throws.TypeOf<StorageException>()); 
+        Assert.That(() =>
+        _softwareBusinessLogicContract.GetSoftwareByData("name"),
+        Throws.TypeOf<StorageException>());
+        _softwareStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Once);
+        _softwareStorageContract.Verify(x =>
+        x.GetElementByName(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void InsertSoftware_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new SoftwareDataModel(Guid.NewGuid().ToString(), "name",
+        SoftwareType.Windows, Guid.NewGuid().ToString(), 10, false);
+        _softwareStorageContract.Setup(x =>
+        x.AddElement(It.IsAny<SoftwareDataModel>()))
+        .Callback((SoftwareDataModel x) =>
+        {
+            flag = x.Id == record.Id && x.SoftwareName ==
+    record.SoftwareName && x.SoftwareType == record.SoftwareType &&
+    x.ManufacturerId == record.ManufacturerId && x.Price ==
+    record.Price && x.IsDeleted == record.IsDeleted;
+        });
+        //Act
+        _softwareBusinessLogicContract.InsertSoftware(record);
+        //Assert
+        _softwareStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<SoftwareDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void InsertSoftware_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _softwareStorageContract.Setup(x =>
+        x.AddElement(It.IsAny<SoftwareDataModel>())).Throws(new
+        ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.InsertSoftware(new(Guid.NewGuid().ToString(),
+        "name", SoftwareType.Windows, Guid.NewGuid().ToString(), 10, false)),
+        Throws.TypeOf<ElementExistsException>());
+        _softwareStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<SoftwareDataModel>()), Times.Once);
+    }
+    [Test]
+    public void InsertSoftware_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _softwareBusinessLogicContract.InsertSoftware(null),
+        Throws.TypeOf<ArgumentNullException>());
+        _softwareStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<SoftwareDataModel>()), Times.Never);
+    }
+    [Test]
+    public void InsertSoftware_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert 
+        Assert.That(() => _softwareBusinessLogicContract.InsertSoftware(new
+        SoftwareDataModel("id", "name", SoftwareType.Windows, Guid.NewGuid().ToString(),
+        10, false)), Throws.TypeOf<ValidationException>());
+        _softwareStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<SoftwareDataModel>()), Times.Never);
+    }
+    [Test]
+    public void InsertSoftware_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _softwareStorageContract.Setup(x =>
+        x.AddElement(It.IsAny<SoftwareDataModel>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.InsertSoftware(new(Guid.NewGuid().ToString(),
+        "name", SoftwareType.Windows, Guid.NewGuid().ToString(), 10, false)),
+        Throws.TypeOf<StorageException>());
+        _softwareStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<SoftwareDataModel>()), Times.Once);
+    }
+    [Test]
+    public void UpdateSoftware_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new SoftwareDataModel(Guid.NewGuid().ToString(), "name",
+        SoftwareType.Windows, Guid.NewGuid().ToString(), 10, false);
+        _softwareStorageContract.Setup(x =>
+        x.UpdElement(It.IsAny<SoftwareDataModel>()))
+        .Callback((SoftwareDataModel x) =>
+        {
+            flag = x.Id == record.Id && x.SoftwareName ==
+    record.SoftwareName && x.SoftwareType == record.SoftwareType &&
+    x.ManufacturerId == record.ManufacturerId && x.Price ==
+    record.Price && x.IsDeleted == record.IsDeleted;
+        });
+        //Act
+        _softwareBusinessLogicContract.UpdateSoftware(record);
+        //Assert
+        _softwareStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<SoftwareDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void UpdateSoftware_RecordWithIncorrectData_ThrowException_Test()
+    {
+        //Arrange
+        _softwareStorageContract.Setup(x =>
+        x.UpdElement(It.IsAny<SoftwareDataModel>())).Throws(new
+        ElementNotFoundException(""));
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.UpdateSoftware(new(Guid.NewGuid().ToString(),
+        "name", SoftwareType.Windows, Guid.NewGuid().ToString(), 10, false)),
+        Throws.TypeOf<ElementNotFoundException>());
+        _softwareStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<SoftwareDataModel>()), Times.Once);
+    }
+    [Test]
+ 
+    public void UpdateSoftware_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _softwareStorageContract.Setup(x =>
+        x.UpdElement(It.IsAny<SoftwareDataModel>())).Throws(new
+        ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.UpdateSoftware(new(Guid.NewGuid().ToString(),
+        "anme", SoftwareType.Windows, Guid.NewGuid().ToString(), 10, false)),
+        Throws.TypeOf<ElementExistsException>());
+        _softwareStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<SoftwareDataModel>()), Times.Once);
+    }
+    [Test]
+    public void UpdateSoftware_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _softwareBusinessLogicContract.UpdateSoftware(null),
+        Throws.TypeOf<ArgumentNullException>());
+        _softwareStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<SoftwareDataModel>()), Times.Never);
+    }
+    [Test]
+    public void UpdateSoftware_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _softwareBusinessLogicContract.UpdateSoftware(new
+        SoftwareDataModel("id", "name", SoftwareType.Windows, Guid.NewGuid().ToString(),
+        10, false)), Throws.TypeOf<ValidationException>());
+        _softwareStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<SoftwareDataModel>()), Times.Never);
+    }
+    [Test]
+    public void UpdateSoftware_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _softwareStorageContract.Setup(x =>
+        x.UpdElement(It.IsAny<SoftwareDataModel>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.UpdateSoftware(new(Guid.NewGuid().ToString(),
+        "name", SoftwareType.Windows, Guid.NewGuid().ToString(), 10, false)),
+        Throws.TypeOf<StorageException>());
+        _softwareStorageContract.Verify(x =>
+        x.UpdElement(It.IsAny<SoftwareDataModel>()), Times.Once);
+    }
+    [Test]
+    public void DeleteSoftware_CorrectRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var flag = false;
+        _softwareStorageContract.Setup(x => x.DelElement(It.Is((string x) => x
+        == id))).Callback(() => { flag = true; });
+        //Act
+        _softwareBusinessLogicContract.DeleteSoftware(id);
+        //Assert 
+        _softwareStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void DeleteSoftware_RecordWithIncorrectId_ThrowException_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        _softwareStorageContract.Setup(x =>
+        x.DelElement(It.IsAny<string>())).Throws(new ElementNotFoundException(id));
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.DeleteSoftware(Guid.NewGuid().ToString()),
+        Throws.TypeOf<ElementNotFoundException>());
+        _softwareStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Once);
+    }
+    [Test]
+    public void DeleteSoftware_IdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _softwareBusinessLogicContract.DeleteSoftware(null),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _softwareBusinessLogicContract.DeleteSoftware(string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _softwareStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Never);
+    }
+    [Test]
+    public void DeleteSoftware_IdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _softwareBusinessLogicContract.DeleteSoftware("id"),
+        Throws.TypeOf<ValidationException>());
+        _softwareStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Never);
+    }
+    [Test]
+    public void DeleteSoftware_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _softwareStorageContract.Setup(x =>
+        x.DelElement(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _softwareBusinessLogicContract.DeleteSoftware(Guid.NewGuid().ToString()),
+        Throws.TypeOf<StorageException>());
+        _softwareStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Once);
+    }
+}
+

SmallSoftwareProject/SmallSoftwareTests/BusinessLogicsContractsTests/WorkerBusinessLogicContractTests.cs

@@ -0,0 +1,766 @@
+using Microsoft.Extensions.Logging;
+using Moq;
+using SmallSoftwareBusinessLogic.Implementations;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using SmallSoftwareContracts.StoragesContracts;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+internal class WorkerBusinessLogicContractTests
+{
+    private WorkerBusinessLogicContract _workerBusinessLogicContract;
+    private Mock<IWorkerStorageContract> _workerStorageContract;
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        _workerStorageContract = new Mock<IWorkerStorageContract>();
+        _workerBusinessLogicContract = new
+        WorkerBusinessLogicContract(_workerStorageContract.Object, new
+        Mock<ILogger>().Object);
+    }
+    [SetUp]
+    public void SetUp()
+    {
+        _workerStorageContract.Reset();
+    }
+    [Test]
+    public void GetAllWorkers_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var listOriginal = new List<WorkerDataModel>() 
+    {
+            new(Guid.NewGuid().ToString(), "fio 1",
+            Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+            false),
+            new(Guid.NewGuid().ToString(), "fio 2",
+            Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+            true),
+            new(Guid.NewGuid().ToString(), "fio 3",
+            Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+            false),
+    };
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Returns(listOriginal);
+        //Act
+        var listOnlyActive =
+        _workerBusinessLogicContract.GetAllWorkers(true);
+        var list = _workerBusinessLogicContract.GetAllWorkers(false);
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null);
+            Assert.That(list, Is.Not.Null);
+            Assert.That(listOnlyActive, Is.EquivalentTo(listOriginal));
+            Assert.That(list, Is.EquivalentTo(listOriginal));
+        });
+        _workerStorageContract.Verify(x => x.GetList(true, null, null, null,
+        null, null), Times.Once);
+        _workerStorageContract.Verify(x => x.GetList(false, null, null, null,
+        null, null), Times.Once);
+    }
+    [Test]
+    public void GetAllWorkers_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Returns([]);
+        //Act
+        var listOnlyActive =
+        _workerBusinessLogicContract.GetAllWorkers(true);
+        var list = _workerBusinessLogicContract.GetAllWorkers(false);
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null);
+            Assert.That(list, Is.Not.Null);
+            Assert.That(listOnlyActive, Has.Count.EqualTo(0));
+            Assert.That(list, Has.Count.EqualTo(0));
+        });
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(), null,
+        null, null, null, null), Times.Exactly(2));
+    }
+    [Test]
+    public void GetAllWorkers_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkers(It.IsAny<bool>()),
+        Throws.TypeOf<NullListException>()); 
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Once);
+    }
+    [Test]
+    public void GetAllWorkers_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkers(It.IsAny<bool>()),
+        Throws.TypeOf<StorageException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(), null,
+        null, null, null, null), Times.Once);
+    }
+    [Test]
+    public void GetAllWorkersByPost_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var postId = Guid.NewGuid().ToString();
+        var listOriginal = new List<WorkerDataModel>()
+{
+new(Guid.NewGuid().ToString(), "fio 1",
+Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+false),
+new(Guid.NewGuid().ToString(), "fio 2",
+Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+true),
+new(Guid.NewGuid().ToString(), "fio 3",
+Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+false),
+};
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Returns(listOriginal);
+        //Act
+        var listOnlyActive =
+        _workerBusinessLogicContract.GetAllWorkersByPost(postId, true);
+        var list = _workerBusinessLogicContract.GetAllWorkersByPost(postId,
+        false);
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null);
+            Assert.That(list, Is.Not.Null);
+            Assert.That(listOnlyActive, Is.EquivalentTo(listOriginal));
+            Assert.That(list, Is.EquivalentTo(listOriginal));
+        });
+        _workerStorageContract.Verify(x => x.GetList(true, postId, null,
+        null, null, null), Times.Once);
+        _workerStorageContract.Verify(x => x.GetList(false, postId, null,
+        null, null, null), Times.Once);
+    }
+    [Test]
+    public void GetAllWorkersByPost_ReturnEmptyList_Test()
+    {
+        //Arrange 
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Returns([]);
+        //Act
+        var listOnlyActive =
+        _workerBusinessLogicContract.GetAllWorkersByPost(Guid.NewGuid().ToString(),
+        true);
+        var list =
+        _workerBusinessLogicContract.GetAllWorkersByPost(Guid.NewGuid().ToString(),
+        false);
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null);
+            Assert.That(list, Is.Not.Null);
+            Assert.That(listOnlyActive, Has.Count.EqualTo(0));
+            Assert.That(list, Has.Count.EqualTo(0));
+        });
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Exactly(2));
+    }
+    [Test]
+    public void GetAllWorkersByPost_PostIdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkersByPost(null, It.IsAny<bool>()),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkersByPost(string.Empty, It.IsAny<bool>()),
+        Throws.TypeOf<ArgumentNullException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Never);
+    }
+    [Test]
+    public void GetAllWorkersByPost_PostIdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkersByPost("postId", It.IsAny<bool>()),
+        Throws.TypeOf<ValidationException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Never);
+    }
+    [Test]
+    public void GetAllWorkersByPost_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkersByPost(Guid.NewGuid().ToString(),
+        It.IsAny<bool>()), Throws.TypeOf<NullListException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Once);
+    }
+    [Test]
+    public void GetAllWorkersByPost_StorageThrowError_ThrowException_Test() 
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkersByPost(Guid.NewGuid().ToString(),
+        It.IsAny<bool>()), Throws.TypeOf<StorageException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Once);
+    }
+    [Test]
+    public void GetAllWorkersByBirthDate_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        var listOriginal = new List<WorkerDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), "fio 1",
+            Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+            false),
+            new(Guid.NewGuid().ToString(), "fio 2",
+            Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+            true),
+            new(Guid.NewGuid().ToString(), "fio 3",
+            Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+            false),
+        };
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Returns(listOriginal);
+        //Act
+        var listOnlyActive =
+        _workerBusinessLogicContract.GetAllWorkersByBirthDate(date, date.AddDays(1),
+        true);
+        var list =
+        _workerBusinessLogicContract.GetAllWorkersByBirthDate(date, date.AddDays(1),
+        false);
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null);
+            Assert.That(list, Is.Not.Null);
+            Assert.That(listOnlyActive, Is.EquivalentTo(listOriginal));
+            Assert.That(list, Is.EquivalentTo(listOriginal));
+        });
+        _workerStorageContract.Verify(x => x.GetList(true, null, date,
+        date.AddDays(1), null, null), Times.Once);
+        _workerStorageContract.Verify(x => x.GetList(false, null, date,
+        date.AddDays(1), null, null), Times.Once);
+    }
+    [Test]
+    public void GetAllWorkersByBirthDate_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Returns([]);
+        //Act 
+        var listOnlyActive =
+        _workerBusinessLogicContract.GetAllWorkersByBirthDate(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1), true);
+        var list = _workerBusinessLogicContract.GetAllWorkers(false);
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null);
+            Assert.That(list, Is.Not.Null);
+            Assert.That(listOnlyActive, Has.Count.EqualTo(0));
+            Assert.That(list, Has.Count.EqualTo(0));
+        });
+        _workerStorageContract.Verify(x => x.GetList(true, null,
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>(), null, null), Times.Once);
+        _workerStorageContract.Verify(x => x.GetList(false, null,
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>(), null, null), Times.Once);
+    }
+    [Test]
+    public void GetAllWorkersByBirthDate_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkersByBirthDate(date, date,
+        It.IsAny<bool>()), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkersByBirthDate(date, date.AddSeconds(-1),
+        It.IsAny<bool>()), Throws.TypeOf<IncorrectDatesException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Never);
+    }
+    [Test]
+    public void GetAllWorkersByBirthDate_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkersByBirthDate(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1), It.IsAny<bool>()),
+        Throws.TypeOf<NullListException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetAllWorkersByBirthDate_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkersByBirthDate(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1), It.IsAny<bool>()),
+            Throws.TypeOf<StorageException>()); 
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Once);
+    }
+    [Test]
+    public void GetAllWorkersByEmploymentDate_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        var listOriginal = new List<WorkerDataModel>()
+{
+new(Guid.NewGuid().ToString(), "fio 1",
+Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+false),
+new(Guid.NewGuid().ToString(), "fio 2",
+Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+true),
+new(Guid.NewGuid().ToString(), "fio 3",
+Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+false),
+};
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Returns(listOriginal);
+        //Act
+        var listOnlyActive =
+        _workerBusinessLogicContract.GetAllWorkersByEmploymentDate(date, date.AddDays(1),
+        true);
+        var list =
+        _workerBusinessLogicContract.GetAllWorkersByEmploymentDate(date, date.AddDays(1),
+        false);
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null);
+            Assert.That(list, Is.Not.Null);
+            Assert.That(listOnlyActive, Is.EquivalentTo(listOriginal));
+            Assert.That(list, Is.EquivalentTo(listOriginal));
+        });
+        _workerStorageContract.Verify(x => x.GetList(true, null, null, null,
+        date, date.AddDays(1)), Times.Once);
+        _workerStorageContract.Verify(x => x.GetList(false, null, null, null,
+        date, date.AddDays(1)), Times.Once);
+    }
+    [Test]
+    public void GetAllWorkersByEmploymentDate_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Returns([]);
+        //Act
+        var listOnlyActive =
+        _workerBusinessLogicContract.GetAllWorkersByEmploymentDate(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1), true);
+        var list =
+        _workerBusinessLogicContract.GetAllWorkersByEmploymentDate(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1), false);
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null); 
+            Assert.That(list, Is.Not.Null);
+            Assert.That(listOnlyActive, Has.Count.EqualTo(0));
+            Assert.That(list, Has.Count.EqualTo(0));
+        });
+        _workerStorageContract.Verify(x => x.GetList(true, null, null, null,
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Once);
+        _workerStorageContract.Verify(x => x.GetList(false, null, null, null,
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetAllWorkersByEmploymentDate_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkersByEmploymentDate(date, date,
+        It.IsAny<bool>()), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkersByEmploymentDate(date,
+        date.AddSeconds(-1), It.IsAny<bool>()),
+        Throws.TypeOf<IncorrectDatesException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Never);
+    }
+    [Test]
+    public void GetAllWorkersByEmploymentDate_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkersByEmploymentDate(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1), It.IsAny<bool>()),
+        Throws.TypeOf<NullListException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetAllWorkersByEmploymentDate_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetAllWorkersByEmploymentDate(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1), It.IsAny<bool>()),
+        Throws.TypeOf<StorageException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(),
+        It.IsAny<string?>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Once);
+    }
+    [Test]
+    public void GetWorkerByData_GetById_ReturnRecord_Test()
+    { 
+    //Arrange
+        var id = Guid.NewGuid().ToString();
+        var record = new WorkerDataModel(id, "fio",
+        Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+        false);
+        _workerStorageContract.Setup(x =>
+        x.GetElementById(id)).Returns(record);
+        //Act
+        var element = _workerBusinessLogicContract.GetWorkerByData(id);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.Id, Is.EqualTo(id));
+        _workerStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetWorkerByData_GetByFio_ReturnRecord_Test()
+    {
+        //Arrange
+        var fio = "fio";
+        var record = new WorkerDataModel(Guid.NewGuid().ToString(), fio,
+        Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+        false);
+        _workerStorageContract.Setup(x =>
+        x.GetElementByFIO(fio)).Returns(record);
+        //Act
+        var element = _workerBusinessLogicContract.GetWorkerByData(fio);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.FIO, Is.EqualTo(fio));
+        _workerStorageContract.Verify(x =>
+        x.GetElementByFIO(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetWorkerByData_EmptyData_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.GetWorkerByData(null),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetWorkerByData(string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _workerStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Never);
+        _workerStorageContract.Verify(x =>
+        x.GetElementByFIO(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetWorkerByData_GetById_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _workerBusinessLogicContract.GetWorkerByData(Guid.NewGuid().ToString()),
+        Throws.TypeOf<ElementNotFoundException>());
+        _workerStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Once);
+        _workerStorageContract.Verify(x =>
+        x.GetElementByFIO(It.IsAny<string>()), Times.Never);
+    }
+[Test] 
+public void GetWorkerByData_GetByFio_NotFoundRecord_ThrowException_Test()
+{
+    //Act&Assert
+    Assert.That(() =>
+    _workerBusinessLogicContract.GetWorkerByData("fio"),
+    Throws.TypeOf<ElementNotFoundException>());
+    _workerStorageContract.Verify(x =>
+    x.GetElementById(It.IsAny<string>()), Times.Never);
+    _workerStorageContract.Verify(x =>
+    x.GetElementByFIO(It.IsAny<string>()), Times.Once);
+}
+[Test]
+public void GetWorkerByData_StorageThrowError_ThrowException_Test()
+{
+    //Arrange
+    _workerStorageContract.Setup(x =>
+    x.GetElementById(It.IsAny<string>())).Throws(new StorageException(new
+    InvalidOperationException()));
+    _workerStorageContract.Setup(x =>
+    x.GetElementByFIO(It.IsAny<string>())).Throws(new StorageException(new
+    InvalidOperationException()));
+    //Act&Assert
+    Assert.That(() =>
+    _workerBusinessLogicContract.GetWorkerByData(Guid.NewGuid().ToString()),
+    Throws.TypeOf<StorageException>());
+    Assert.That(() =>
+    _workerBusinessLogicContract.GetWorkerByData("fio"),
+    Throws.TypeOf<StorageException>());
+    _workerStorageContract.Verify(x =>
+    x.GetElementById(It.IsAny<string>()), Times.Once);
+    _workerStorageContract.Verify(x =>
+    x.GetElementByFIO(It.IsAny<string>()), Times.Once);
+}
+[Test]
+public void InsertWorker_CorrectRecord_Test()
+{
+    //Arrange
+    var flag = false;
+    var record = new WorkerDataModel(Guid.NewGuid().ToString(), "fio",
+    Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+    false);
+    _workerStorageContract.Setup(x =>
+    x.AddElement(It.IsAny<WorkerDataModel>()))
+    .Callback((WorkerDataModel x) =>
+    {
+        flag = x.Id == record.Id && x.FIO == record.FIO &&
+    x.PostId == record.PostId && x.BirthDate == record.BirthDate &&
+    x.EmploymentDate == record.EmploymentDate &&
+    x.IsDeleted == record.IsDeleted;
+    });
+    //Act
+    _workerBusinessLogicContract.InsertWorker(record);
+    //Assert
+    _workerStorageContract.Verify(x =>
+    x.AddElement(It.IsAny<WorkerDataModel>()), Times.Once);
+    Assert.That(flag);
+}
+[Test]
+public void InsertWorker_RecordWithExistsData_ThrowException_Test()
+{
+    //Arrange 
+    _workerStorageContract.Setup(x =>
+    x.AddElement(It.IsAny<WorkerDataModel>())).Throws(new
+    ElementExistsException("Data", "Data"));
+    //Act&Assert
+    Assert.That(() =>
+    _workerBusinessLogicContract.InsertWorker(new(Guid.NewGuid().ToString(), "fio",
+    Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+    false)), Throws.TypeOf<ElementExistsException>());
+    _workerStorageContract.Verify(x =>
+    x.AddElement(It.IsAny<WorkerDataModel>()), Times.Once);
+}
+[Test]
+public void InsertWorker_NullRecord_ThrowException_Test()
+{
+    //Act&Assert
+    Assert.That(() => _workerBusinessLogicContract.InsertWorker(null),
+    Throws.TypeOf<ArgumentNullException>());
+    _workerStorageContract.Verify(x =>
+    x.AddElement(It.IsAny<WorkerDataModel>()), Times.Never);
+}
+[Test]
+public void InsertWorker_InvalidRecord_ThrowException_Test()
+{
+    //Act&Assert
+    Assert.That(() => _workerBusinessLogicContract.InsertWorker(new
+    WorkerDataModel("id", "fio", Guid.NewGuid().ToString(), DateTime.Now.AddYears(-
+    16).AddDays(-1), DateTime.Now, false)), Throws.TypeOf<ValidationException>());
+    _workerStorageContract.Verify(x =>
+    x.AddElement(It.IsAny<WorkerDataModel>()), Times.Never);
+}
+[Test]
+public void InsertWorker_StorageThrowError_ThrowException_Test()
+{
+    //Arrange
+    _workerStorageContract.Setup(x =>
+    x.AddElement(It.IsAny<WorkerDataModel>())).Throws(new StorageException(new
+    InvalidOperationException()));
+    //Act&Assert
+    Assert.That(() =>
+    _workerBusinessLogicContract.InsertWorker(new(Guid.NewGuid().ToString(), "fio",
+    Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+    false)), Throws.TypeOf<StorageException>());
+    _workerStorageContract.Verify(x =>
+    x.AddElement(It.IsAny<WorkerDataModel>()), Times.Once);
+}
+[Test]
+public void UpdateWorker_CorrectRecord_Test()
+{
+    //Arrange
+    var flag = false;
+    var record = new WorkerDataModel(Guid.NewGuid().ToString(), "fio",
+    Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+    false);
+    _workerStorageContract.Setup(x =>
+    x.UpdElement(It.IsAny<WorkerDataModel>()))
+    .Callback((WorkerDataModel x) =>
+    {
+        flag = x.Id == record.Id && x.FIO == record.FIO &&
+        x.PostId == record.PostId && x.BirthDate == record.BirthDate && 
+        x.EmploymentDate == record.EmploymentDate &&
+        x.IsDeleted == record.IsDeleted;
+    });
+    //Act
+    _workerBusinessLogicContract.UpdateWorker(record);
+    //Assert
+    _workerStorageContract.Verify(x =>
+    x.UpdElement(It.IsAny<WorkerDataModel>()), Times.Once);
+    Assert.That(flag);
+}
+[Test]
+public void UpdateWorker_RecordWithIncorrectData_ThrowException_Test()
+{
+    //Arrange
+    _workerStorageContract.Setup(x =>
+    x.UpdElement(It.IsAny<WorkerDataModel>())).Throws(new
+    ElementNotFoundException(""));
+    //Act&Assert
+    Assert.That(() =>
+    _workerBusinessLogicContract.UpdateWorker(new(Guid.NewGuid().ToString(), "fio",
+    Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+    false)), Throws.TypeOf<ElementNotFoundException>());
+    _workerStorageContract.Verify(x =>
+    x.UpdElement(It.IsAny<WorkerDataModel>()), Times.Once);
+}
+[Test]
+public void UpdateWorker_NullRecord_ThrowException_Test()
+{
+    //Act&Assert
+    Assert.That(() => _workerBusinessLogicContract.UpdateWorker(null),
+    Throws.TypeOf<ArgumentNullException>());
+    _workerStorageContract.Verify(x =>
+    x.UpdElement(It.IsAny<WorkerDataModel>()), Times.Never);
+}
+[Test]
+public void UpdateWorker_InvalidRecord_ThrowException_Test()
+{
+    //Act&Assert
+    Assert.That(() => _workerBusinessLogicContract.UpdateWorker(new
+    WorkerDataModel("id", "fio", Guid.NewGuid().ToString(), DateTime.Now.AddYears(-
+    16).AddDays(-1), DateTime.Now, false)), Throws.TypeOf<ValidationException>());
+    _workerStorageContract.Verify(x =>
+    x.UpdElement(It.IsAny<WorkerDataModel>()), Times.Never);
+}
+[Test]
+public void UpdateWorker_StorageThrowError_ThrowException_Test()
+{
+    //Arrange
+    _workerStorageContract.Setup(x =>
+    x.UpdElement(It.IsAny<WorkerDataModel>())).Throws(new StorageException(new
+    InvalidOperationException()));
+    //Act&Assert
+    Assert.That(() =>
+    _workerBusinessLogicContract.UpdateWorker(new(Guid.NewGuid().ToString(), "fio",
+    Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(-1), DateTime.Now,
+    false)), Throws.TypeOf<StorageException>());
+    _workerStorageContract.Verify(x =>
+    x.UpdElement(It.IsAny<WorkerDataModel>()), Times.Once);
+} 
+[Test]
+public void DeleteWorker_CorrectRecord_Test()
+{
+    //Arrange
+    var id = Guid.NewGuid().ToString();
+    var flag = false;
+    _workerStorageContract.Setup(x => x.DelElement(It.Is((string x) => x
+    == id))).Callback(() => { flag = true; });
+    //Act
+    _workerBusinessLogicContract.DeleteWorker(id);
+    //Assert
+    _workerStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+    Times.Once);
+    Assert.That(flag);
+}
+[Test]
+public void DeleteWorker_RecordWithIncorrectId_ThrowException_Test()
+{
+    //Arrange
+    var id = Guid.NewGuid().ToString();
+    _workerStorageContract.Setup(x => x.DelElement(It.Is((string x) => x
+    != id))).Throws(new ElementNotFoundException(id));
+    //Act&Assert
+    Assert.That(() =>
+    _workerBusinessLogicContract.DeleteWorker(Guid.NewGuid().ToString()),
+    Throws.TypeOf<ElementNotFoundException>());
+    _workerStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+    Times.Once);
+}
+[Test]
+public void DeleteWorker_IdIsNullOrEmpty_ThrowException_Test()
+{
+    //Act&Assert
+    Assert.That(() => _workerBusinessLogicContract.DeleteWorker(null),
+    Throws.TypeOf<ArgumentNullException>());
+    Assert.That(() =>
+    _workerBusinessLogicContract.DeleteWorker(string.Empty),
+    Throws.TypeOf<ArgumentNullException>());
+    _workerStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+    Times.Never);
+}
+[Test]
+public void DeleteWorker_IdIsNotGuid_ThrowException_Test()
+{
+    //Act&Assert
+    Assert.That(() => _workerBusinessLogicContract.DeleteWorker("id"),
+    Throws.TypeOf<ValidationException>());
+    _workerStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+    Times.Never);
+}
+[Test]
+public void DeleteWorker_StorageThrowError_ThrowException_Test()
+{
+    //Arrange
+    _workerStorageContract.Setup(x =>
+    x.DelElement(It.IsAny<string>())).Throws(new StorageException(new
+    InvalidOperationException()));
+    //Act&Assert 
+    Assert.That(() =>
+    _workerBusinessLogicContract.DeleteWorker(Guid.NewGuid().ToString()),
+    Throws.TypeOf<StorageException>());
+    _workerStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+    Times.Once);
+}
+}
+

SmallSoftwareProject/SmallSoftwareTests/DataModelsTests/InstallationRequestDataModelTests.cs

@@ -0,0 +1,87 @@
+using Microsoft.VisualStudio.TestPlatform.ObjectModel.DataCollection;
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareTests.DataModelsTests;
+ 
+
+[TestFixture]
+internal class InstallationRequestDataModelTests
+{
+    [Test]
+    public void SoftwareIdIsNullOrEmptyTest()
+    {
+        var installationRequest = CreateDataModel(null, Guid.NewGuid().ToString(),
+        10, 10);
+        Assert.That(() => installationRequest.Validate(),
+        Throws.TypeOf<ValidationException>());
+        installationRequest = CreateDataModel(string.Empty,
+        Guid.NewGuid().ToString(), 10, 10);
+        Assert.That(() => installationRequest.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void SoftwareIdIsNotGuidTest()
+    {
+        var installationRequest = CreateDataModel("softwareId",
+        Guid.NewGuid().ToString(), 10, 10);
+        Assert.That(() => installationRequest.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void RequestIdIsNullOrEmptyTest()
+    {
+        var installationRequest = CreateDataModel(Guid.NewGuid().ToString(), null,
+        10, 10);
+        Assert.That(() => installationRequest.Validate(),
+        Throws.TypeOf<ValidationException>());
+        installationRequest = CreateDataModel(string.Empty,
+        Guid.NewGuid().ToString(), 10, 10);
+        Assert.That(() => installationRequest.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void RequestIdIsNotGuidTest()
+    {
+        var installationRequest = CreateDataModel(Guid.NewGuid().ToString(),
+        "requestId", 10, 10);
+        Assert.That(() => installationRequest.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void CountIsLessOrZeroTest()
+    {
+        var installationRequest = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), 0, 0);
+        Assert.That(() => installationRequest.Validate(),
+        Throws.TypeOf<ValidationException>()); 
+    installationRequest = CreateDataModel(Guid.NewGuid().ToString(),
+    Guid.NewGuid().ToString(), -10, -20);
+        Assert.That(() => installationRequest.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var softwareId = Guid.NewGuid().ToString();
+        var requestId = Guid.NewGuid().ToString();
+        var count = 10;
+        var price = 10;
+        var installationRequest = CreateDataModel(softwareId, requestId, count, price);
+        Assert.That(() => installationRequest.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(installationRequest.SoftwareId, Is.EqualTo(softwareId));
+            Assert.That(installationRequest.RequestId, Is.EqualTo(requestId));
+            Assert.That(installationRequest.Count, Is.EqualTo(count));
+        });
+    }
+    private static InstallationRequestDataModel CreateDataModel(string? softwareId, string?
+    requestId, int count, double price) =>
+    new(softwareId, requestId, count, price);
+}

SmallSoftwareProject/SmallSoftwareTests/DataModelsTests/ManufacturerDataModelTests.cs

@@ -0,0 +1,67 @@
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareTests.DataModelsTests;
+
+[TestFixture]
+internal class ManufacturerDataModelTests
+{
+    [Test]
+    public void IdIsNullEmptyTest()
+    {
+        var manufacturer = CreateDataModel(null, "name");
+        Assert.That(() => manufacturer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        manufacturer = CreateDataModel(string.Empty, "name");
+        Assert.That(() => manufacturer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var manufacturer = CreateDataModel("id", "name");
+        Assert.That(() => manufacturer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void ManufacturerNameIsNullOrEmptyTest()
+    {
+        var manufacturer = CreateDataModel(Guid.NewGuid().ToString(), null);
+        Assert.That(() => manufacturer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        manufacturer = CreateDataModel(Guid.NewGuid().ToString(),
+        string.Empty);
+        Assert.That(() => manufacturer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var manufacturerId = Guid.NewGuid().ToString();
+        var manufacturerName = "name";
+        var prevManufacturerName = "prevManufacturerName";
+        var prevPrevManufacturerName = "prevPrevManufacturerName";
+        var manufacturer = CreateDataModel(manufacturerId, manufacturerName,
+        prevManufacturerName, prevPrevManufacturerName);
+        Assert.That(() => manufacturer.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(manufacturer.Id, Is.EqualTo(manufacturerId));
+            Assert.That(manufacturer.ManufacturerName,
+            Is.EqualTo(manufacturerName));
+            Assert.That(manufacturer.PrevManufacturerName,
+            Is.EqualTo(prevManufacturerName));
+            Assert.That(manufacturer.PrevPrevManufacturerName,
+            Is.EqualTo(prevPrevManufacturerName));
+        });
+    }
+    private static ManufacturerDataModel CreateDataModel(string? id, string?
+    manufacturerName, string? prevManufacturerName = null, string?
+    prevPrevManufacturerName = null) =>
+        new (id, manufacturerName, prevManufacturerName, prevPrevManufacturerName);
+}

SmallSoftwareProject/SmallSoftwareTests/DataModelsTests/PostDataModelTests.cs

@@ -0,0 +1,89 @@
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Enums;
+using SmallSoftwareContracts.Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareTests.DataModelsTests;
+
+[TestFixture]
+internal class PostDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var post = CreateDataModel(null, "name",
+        PostType.SoftInstaller, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(string.Empty, "name", PostType.SoftInstaller, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var post = CreateDataModel("id", "name", PostType.SoftInstaller, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+
+    public void PostNameIsEmptyTest()
+    {
+        var manufacturer = CreateDataModel(Guid.NewGuid().ToString(), null, PostType.SoftInstaller, 10, true, DateTime.UtcNow);
+        Assert.That(() => manufacturer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        manufacturer = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, PostType.SoftInstaller, 10, true,
+        DateTime.UtcNow);
+        Assert.That(() => manufacturer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PostTypeIsNoneTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), "name", PostType.None, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void SalaryIsLessOrZeroTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(),
+        "name", PostType.SoftInstaller, 0, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(Guid.NewGuid().ToString(), "name", PostType.SoftInstaller, -10, true,
+        DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var postId = Guid.NewGuid().ToString();
+        var postPostId = Guid.NewGuid().ToString();
+        var postName = "name";
+        var postType = PostType.SoftInstaller;
+        var salary = 10;
+        var isActual = false;
+        var changeDate = DateTime.UtcNow.AddDays(-1);
+        var post = CreateDataModel(postId, postName, postType,
+        salary, isActual, changeDate);
+        Assert.That(() => post.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(post.Id, Is.EqualTo(postId));
+            Assert.That(post.PostName, Is.EqualTo(postName));
+            Assert.That(post.PostType, Is.EqualTo(postType));
+            Assert.That(post.Salary, Is.EqualTo(salary));
+        });
+    }
+    private static PostDataModel CreateDataModel(string? id, 
+    string? postName, PostType postType, double salary, bool isActual, DateTime
+    changeDate) => 
+        new (id, postName, postType, salary);
+}

SmallSoftwareProject/SmallSoftwareTests/DataModelsTests/RequestDataModelTests.cs

@@ -0,0 +1,95 @@
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+
+namespace SmallSoftwareTests.DataModelsTests;
+
+[TestFixture]
+internal class RequestDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var request = CreateDataModel(null, Guid.NewGuid().ToString(), "test@example.com", false, CreateSubDataModel() , DateTime.UtcNow);
+        Assert.That(() => request.Validate(), Throws.TypeOf<ValidationException>());
+
+        request = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), "test@example.com", false, CreateSubDataModel(), DateTime.UtcNow);
+        Assert.That(() => request.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var request = CreateDataModel("id", Guid.NewGuid().ToString(), "test@example.com", false, CreateSubDataModel(), DateTime.UtcNow);
+        Assert.That(() => request.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void WorkerIdIsNullOrEmptyTest()
+    {
+        var request = CreateDataModel(Guid.NewGuid().ToString(), null, "test@example.com", false, CreateSubDataModel(), DateTime.UtcNow);
+        Assert.That(() => request.Validate(), Throws.TypeOf<ValidationException>());
+
+        request = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, "test@example.com", false, CreateSubDataModel(), DateTime.UtcNow);
+        Assert.That(() => request.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void WorkerIdIsNotGuidTest()
+    {
+        var request = CreateDataModel(Guid.NewGuid().ToString(), "workerId", "test@example.com",  false, CreateSubDataModel(), DateTime.UtcNow);
+        Assert.That(() => request.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void EmailIsInvalidTest()
+    {
+        var request = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "invalid_email",  false, CreateSubDataModel(), DateTime.UtcNow);
+        Assert.That(() => request.Validate(), Throws.TypeOf<ValidationException>());
+
+        request = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "@",  false, CreateSubDataModel(), DateTime.UtcNow);
+        Assert.That(() => request.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+
+    [Test]
+    public void SoftwaresIsNullOrEmptyTest()
+    {
+        var request = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "test@example.com", false, null, DateTime.UtcNow);
+        Assert.That(() => request.Validate(), Throws.TypeOf<ValidationException>());
+
+        request = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "test@example.com", false, new List<InstallationRequestDataModel>(), DateTime.UtcNow);
+        Assert.That(() => request.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsAreCorrectTest()
+    {
+        var requestId = Guid.NewGuid().ToString();
+        var workerId = Guid.NewGuid().ToString();
+        var email = "test@example.com";
+        var sum = 10;
+        var isCancel = true;
+        var softwares = CreateSubDataModel();
+
+        var request = CreateDataModel(requestId, workerId, email, isCancel, softwares, DateTime.UtcNow);
+
+        Assert.That(() => request.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(request.Id, Is.EqualTo(requestId));
+            Assert.That(request.WorkerId, Is.EqualTo(workerId));
+            Assert.That(request.Email, Is.EqualTo(email));
+            Assert.That(request.Sum, Is.EqualTo(sum));
+            Assert.That(request.IsCancel, Is.EqualTo(isCancel));
+            Assert.That(request.Softwares, Is.EquivalentTo(softwares));
+        });
+    }
+
+    private static RequestDataModel CreateDataModel(string? id, string? workerId, string email,  bool isCancel, List<InstallationRequestDataModel>? softwares, DateTime requestDate) =>
+        new(id, workerId, email, isCancel, softwares, requestDate );
+
+    private static List<InstallationRequestDataModel> CreateSubDataModel() =>
+        [new InstallationRequestDataModel(Guid.NewGuid().ToString(), "SoftwareName", 1, 10)];
+}
+
+

SmallSoftwareProject/SmallSoftwareTests/DataModelsTests/SalaryDataModelTests.cs

@@ -0,0 +1,61 @@
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareTests.DataModelsTests;
+
+[TestFixture]
+internal class SalaryDataModelTests
+{
+    [Test]
+    public void WorkerIdIsEmptyTest()
+    {
+        var salary = CreateDataModel(null, DateTime.Now, 10);
+        Assert.That(() => salary.Validate(),
+        Throws.TypeOf<ValidationException>());
+        salary = CreateDataModel(string.Empty, DateTime.Now, 10);
+        Assert.That(() => salary.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void WorkerIdIsNotGuidTest()
+    {
+        var salary = CreateDataModel("workerId", DateTime.Now, 10);
+        Assert.That(() => salary.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PriceIsLessOrZeroTest()
+    {
+        var salary = CreateDataModel(Guid.NewGuid().ToString(), DateTime.Now,
+        0);
+        Assert.That(() => salary.Validate(),
+        Throws.TypeOf<ValidationException>());
+        salary = CreateDataModel(Guid.NewGuid().ToString(), DateTime.Now, -
+        10);
+        Assert.That(() => salary.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var workerId = Guid.NewGuid().ToString();
+        var salaryDate = DateTime.Now.AddDays(-3).AddMinutes(-5);
+        var workerSalary = 10;
+        var salary = CreateDataModel(workerId, salaryDate, workerSalary);
+        Assert.That(() => salary.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(salary.WorkerId, Is.EqualTo(workerId));
+            Assert.That(salary.SalaryDate, Is.EqualTo(salaryDate));
+            Assert.That(salary.Salary, Is.EqualTo(workerSalary));
+        });
+    }
+    private static SalaryDataModel CreateDataModel(string? workerId, DateTime
+    salaryDate, double workerSalary) =>
+    new(workerId, salaryDate, workerSalary);
+}

SmallSoftwareProject/SmallSoftwareTests/DataModelsTests/SoftwareDataModelTests.cs

@@ -0,0 +1,116 @@
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Enums;
+using SmallSoftwareContracts.Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using static NUnit.Framework.Internal.OSPlatform;
+
+namespace SmallSoftwareTests.DataModelsTests;
+
+
+[TestFixture]
+internal class SoftwareDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var software = CreateDataModel(null, "name", SoftwareType.Windows,
+        Guid.NewGuid().ToString(), 10, false);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+        software = CreateDataModel(string.Empty, "name",
+        SoftwareType.Windows, Guid.NewGuid().ToString(), 10, false);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var software = CreateDataModel("id", "name", SoftwareType.Windows,
+        Guid.NewGuid().ToString(), 10, false);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void SoftwareNameIsEmptyTest()
+    {
+        var software = CreateDataModel(Guid.NewGuid().ToString(), null,
+        SoftwareType.Windows, Guid.NewGuid().ToString(), 10, false);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+        software = CreateDataModel(Guid.NewGuid().ToString(), string.Empty,
+        SoftwareType.Windows, Guid.NewGuid().ToString(), 10, false);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void SoftwareTypeIsNoneTest()
+    {
+        var software = CreateDataModel(Guid.NewGuid().ToString(), null,
+        SoftwareType.None, Guid.NewGuid().ToString(), 10, false);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void ManufacturerIdIsNullOrEmptyTest()
+    { 
+    var software = CreateDataModel(Guid.NewGuid().ToString(), "name",
+    SoftwareType.Windows, null, 10, false);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+        software = CreateDataModel(Guid.NewGuid().ToString(), "name",
+        SoftwareType.Windows, string.Empty, 10, false);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void ManufacturerIdIsNotGuidTest()
+    {
+        var software = CreateDataModel(Guid.NewGuid().ToString(), "name",
+        SoftwareType.Windows, "manufacturerId", 10, false);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PriceIsLessOrZeroTest()
+    {
+        var software = CreateDataModel(Guid.NewGuid().ToString(), "name",
+        SoftwareType.Windows, Guid.NewGuid().ToString(), 0, false);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+        software = CreateDataModel(Guid.NewGuid().ToString(), "name",
+        SoftwareType.Windows, Guid.NewGuid().ToString(), -10, false);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var softwareId = Guid.NewGuid().ToString();
+        var softwareName = "name";
+        var softwareType = SoftwareType.Windows;
+        var softwareManufacturerId = Guid.NewGuid().ToString();
+        var softwarePrice = 10;
+        var softwareIsDelete = false;
+        var software = CreateDataModel(softwareId, softwareName, softwareType,
+        softwareManufacturerId, softwarePrice, softwareIsDelete);
+        Assert.That(() => software.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(software.Id, Is.EqualTo(softwareId));
+            Assert.That(software.SoftwareName, Is.EqualTo(softwareName));
+            Assert.That(software.SoftwareType, Is.EqualTo(softwareType));
+            Assert.That(software.ManufacturerId,
+            Is.EqualTo(softwareManufacturerId));
+            Assert.That(software.Price, Is.EqualTo(softwarePrice));
+            Assert.That(software.IsDeleted, Is.EqualTo(softwareIsDelete));
+        });
+    }
+    private static SoftwareDataModel CreateDataModel(string? id, string?
+    softwareName, SoftwareType softwareType, string? manufacturerId, double price, bool
+    isDeleted) =>
+    new(id, softwareName, softwareType, manufacturerId, price, isDeleted);
+}

SmallSoftwareProject/SmallSoftwareTests/DataModelsTests/SoftwareHistoryDataModelTests.cs

@@ -0,0 +1,62 @@
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareTests.DataModelsTests;
+
+
+[TestFixture]
+internal class SoftwareHistoryDataModelTests
+{
+    [Test]
+    public void SoftwareIdIsNullOrEmptyTest()
+    {
+        var software = CreateDataModel(null, 10);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+        software = CreateDataModel(string.Empty, 10);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void SoftwareIdIsNotGuidTest()
+    {
+        var software = CreateDataModel("id", 10);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void OldPriceIsLessOrZeroTest()
+    {
+        var software = CreateDataModel(Guid.NewGuid().ToString(), 0);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+        software = CreateDataModel(Guid.NewGuid().ToString(), -10);
+        Assert.That(() => software.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var softwareId = Guid.NewGuid().ToString();
+        var oldPrice = 10;
+        var softwareHistory = CreateDataModel(softwareId, oldPrice);
+        Assert.That(() => softwareHistory.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(softwareHistory.SoftwareId, Is.EqualTo(softwareId));
+            Assert.That(softwareHistory.OldPrice, Is.EqualTo(oldPrice));
+            Assert.That(softwareHistory.ChangeDate,
+            Is.LessThan(DateTime.UtcNow));
+            Assert.That(softwareHistory.ChangeDate,
+            Is.GreaterThan(DateTime.UtcNow.AddMinutes(-1)));
+        });
+    }
+    private static SoftwareHistoryDataModel CreateDataModel(string? softwareId,
+    double oldPrice) =>
+    new(softwareId, oldPrice);
+}

SmallSoftwareProject/SmallSoftwareTests/DataModelsTests/WorkerDataModelTests.cs

@@ -0,0 +1,115 @@
+using SmallSoftwareContracts.DataModels;
+using SmallSoftwareContracts.Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareTests.DataModelsTests;
+
+[TestFixture]
+internal class WorkerDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var worker = CreateDataModel(null, "fio", Guid.NewGuid().ToString(),
+        DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(),
+        Throws.TypeOf<ValidationException>());
+        worker = CreateDataModel(string.Empty, "fio",
+        Guid.NewGuid().ToString(), DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var worker = CreateDataModel("id", "fio", Guid.NewGuid().ToString(),
+        DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void FIOIsNullOrEmptyTest()
+    {
+        var worker = CreateDataModel(Guid.NewGuid().ToString(), null,
+        Guid.NewGuid().ToString(), DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(),
+        Throws.TypeOf<ValidationException>());
+        worker = CreateDataModel(Guid.NewGuid().ToString(), string.Empty,
+        Guid.NewGuid().ToString(), DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PostIdIsNullOrEmptyTest()
+    {
+        var worker = CreateDataModel(Guid.NewGuid().ToString(), "fio", null,
+        DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(),
+        Throws.TypeOf<ValidationException>());
+        worker = CreateDataModel(Guid.NewGuid().ToString(), "fio",
+        string.Empty, DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PostIdIsNotGuidTest()
+    {
+        var worker = CreateDataModel(Guid.NewGuid().ToString(), "fio",
+        "postId", DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void BirthDateIsNotCorrectTest()
+    {
+        var worker = CreateDataModel(Guid.NewGuid().ToString(), "fio",
+        Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(1), DateTime.Now,
+        false);
+        Assert.That(() => worker.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void BirthDateAndEmploymentDateIsNotCorrectTest()
+    {
+        var worker = CreateDataModel(Guid.NewGuid().ToString(), "fio",
+        Guid.NewGuid().ToString(), DateTime.Now.AddYears(-18), DateTime.Now.AddYears(-
+        18).AddDays(-1), false);
+        Assert.That(() => worker.Validate(),
+        Throws.TypeOf<ValidationException>());
+        worker = CreateDataModel(Guid.NewGuid().ToString(), "fio",
+        Guid.NewGuid().ToString(), DateTime.Now.AddYears(-18), DateTime.Now.AddYears(-
+        16), false);
+        Assert.That(() => worker.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var workerId = Guid.NewGuid().ToString();
+        var fio = "fio";
+        var postId = Guid.NewGuid().ToString();
+        var birthDate = DateTime.Now.AddYears(-16).AddDays(-1);
+        var employmentDate = DateTime.Now;
+        var isDelete = false;
+        var worker = CreateDataModel(workerId, fio, postId, birthDate,
+        employmentDate, isDelete);
+        Assert.That(() => worker.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(worker.Id, Is.EqualTo(workerId));
+            Assert.That(worker.FIO, Is.EqualTo(fio));
+            Assert.That(worker.PostId, Is.EqualTo(postId));
+            Assert.That(worker.BirthDate, Is.EqualTo(birthDate));
+            Assert.That(worker.EmploymentDate,
+            Is.EqualTo(employmentDate));
+            Assert.That(worker.IsDeleted, Is.EqualTo(isDelete));
+        });
+    }
+    private static WorkerDataModel CreateDataModel(string? id, string? fio,
+    string? postId, DateTime birthDate, DateTime employmentDate, bool isDeleted) =>
+    new(id, fio, postId, birthDate, employmentDate, isDeleted);
+}

SmallSoftwareProject/SmallSoftwareTests/Infrastructure/ConfigurationDatabaseTest.cs

@@ -0,0 +1,14 @@
+using SmallSoftwareContracts.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SmallSoftwareTests.Infrastructure;
+
+internal class ConfigurationDatabaseTest : IConfigurationDatabase
+{
+    public string ConnectionString => "Host=127.0.0.1;Port=5432;Database=SmallSoftwareTest;Username=postgres;Password=postgres;";
+
+}