лаба2

Сделанная 1 лаба
2025-04-16 00:15:22 +04:00 · 2025-02-27 12:23:58 +04:00
49 changed files with 4358 additions and 1 deletions
--- a/ThreeFatMenProject/ThreeFatMenBusinessLogic/Implementations/BuyerBusinessLogicContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenBusinessLogic/Implementations/BuyerBusinessLogicContract.cs
@@ -0,0 +1,74 @@
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.Json;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.BusinessLogicsContracts;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.Extensions;
+using ThreeFatMenContracts.StoragesContracts;
+
+namespace ThreeFatMenBusinessLogic.Implementations;
+
+internal class BuyerBusinessLogicContract(IBuyerStorageContract buyerStorageContract, ILogger logger) : IBuyerBusinessLogicContract
+{
+
+    private readonly ILogger _logger = logger;
+    private readonly IBuyerStorageContract _buyerStorageContract = buyerStorageContract;
+    public List<BuyerDataModel> GetAllBuyers()
+    {
+        _logger.LogInformation("GetAllBuyers");
+        return _buyerStorageContract.GetList() ?? throw new NullListException();
+    }
+    public BuyerDataModel GetBuyerByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _buyerStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+        }
+        if (Regex.IsMatch(data, @"^((8|\+7)[\- ]?)?(\(?\d{3}\)?[\- ]?)?[\d\-]{7,10}$"))
+        {
+            return _buyerStorageContract.GetElementByPhoneNumber(data) ??
+            throw new ElementNotFoundException(data);
+        }
+        return _buyerStorageContract.GetElementByFIO(data) ?? throw new ElementNotFoundException(data);
+    }
+    public void InsertBuyer(BuyerDataModel buyerDataModel)
+    {
+        _logger.LogInformation("New data: {json}",
+        JsonSerializer.Serialize(buyerDataModel));
+        ArgumentNullException.ThrowIfNull(buyerDataModel);
+        buyerDataModel.Validate();
+        _buyerStorageContract.AddElement(buyerDataModel);
+    }
+    public void UpdateBuyer(BuyerDataModel buyerDataModel)
+    {
+        _logger.LogInformation("Update data: {json}",
+        JsonSerializer.Serialize(buyerDataModel));
+        ArgumentNullException.ThrowIfNull(buyerDataModel);
+        buyerDataModel.Validate();
+        _buyerStorageContract.UpdElement(buyerDataModel);
+    }
+    public void DeleteBuyer(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");
+        }
+        _buyerStorageContract.DelElement(id);
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenBusinessLogic/Implementations/LunchBusinessLogicContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenBusinessLogic/Implementations/LunchBusinessLogicContract.cs
@@ -0,0 +1,85 @@
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.BusinessLogicsContracts;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.Extensions;
+using ThreeFatMenContracts.StoragesContracts;
+
+namespace ThreeFatMenBusinessLogic.Implementations;
+
+internal class LunchBusinessLogicContract(ILunchStorageContract lunchStorageContract, ILogger logger) : ILunchBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly ILunchStorageContract _lunchStorageContract = lunchStorageContract;
+
+    public List<LunchDataModel> GetAllLunches(bool onlyActive)
+    {
+        _logger.LogInformation("GetAllProducts params: {onlyActive}", onlyActive);
+        return _lunchStorageContract.GetList(onlyActive) ?? throw new NullListException();
+    }
+    public List<LunchHistoryDataModel> GetLunchHistoryByLunch(string lunchId)
+    {
+        _logger.LogInformation("GetProductHistoryByProduct for {productId}", lunchId);
+        if (lunchId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(lunchId));
+        }
+        if (!lunchId.IsGuid())
+        {
+            throw new ValidationException("The value in the field productId is not a unique identifier.");
+        }
+        return _lunchStorageContract.GetHistoryByLunchId(lunchId) ??
+        throw new NullListException();
+    }
+    public LunchDataModel GetLunchByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _lunchStorageContract.GetElementById(data) ?? throw
+            new ElementNotFoundException(data);
+        }
+        return _lunchStorageContract.GetElementByName(data) ?? throw new
+        ElementNotFoundException(data);
+    }
+    public void InsertLunch(LunchDataModel lunchDataModel)
+    {
+        _logger.LogInformation("New data: {json}",
+        JsonSerializer.Serialize(lunchDataModel));
+        ArgumentNullException.ThrowIfNull(lunchDataModel);
+        lunchDataModel.Validate();
+        _lunchStorageContract.AddElement(lunchDataModel);
+    }
+    public void UpdateLunch(LunchDataModel lunchDataModel)
+    {
+        _logger.LogInformation("Update data: {json}",
+        JsonSerializer.Serialize(lunchDataModel));
+        ArgumentNullException.ThrowIfNull(lunchDataModel);
+        lunchDataModel.Validate();
+        _lunchStorageContract.UpdElement(lunchDataModel);
+    }
+    public void DeleteLunch(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");
+        }
+        _lunchStorageContract.DelElement(id);
+    }
+
+}
--- a/ThreeFatMenProject/ThreeFatMenBusinessLogic/Implementations/PostBusinessLogicContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenBusinessLogic/Implementations/PostBusinessLogicContract.cs
@@ -0,0 +1,100 @@
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.BuisnessLogicsContracts;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Enums;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.Extensions;
+using ThreeFatMenContracts.StoragesContracts;
+
+namespace ThreeFatMenBusinessLogic.Implementations;
+
+public class PostBusinessLogicContract(IPostStorageContract postStorageContract, ILogger logger) : IPostBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly IPostStorageContract _postStorageContract =
+    postStorageContract;
+    public List<PostDataModel> GetAllPosts(bool onlyActive = true)
+    {
+        _logger.LogInformation("GetAllPosts params: {onlyActive}",
+        onlyActive);
+        return _postStorageContract.GetList(onlyActive) ?? 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);
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenBusinessLogic/Implementations/SaleBusinessLogicContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenBusinessLogic/Implementations/SaleBusinessLogicContract.cs
@@ -0,0 +1,125 @@
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.BusinessLogicsContracts;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.Extensions;
+using ThreeFatMenContracts.StoragesContracts;
+
+namespace ThreeFatMenBusinessLogic.Implementations;
+
+internal class SaleBusinessLogicContract(ISaleStorageContract saleStorageContract, ILogger logger) : ISaleBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly ISaleStorageContract _saleStorageContract =
+    saleStorageContract;
+    public List<SaleDataModel> GetAllSalesByPeriod(DateTime fromDate, DateTime
+    toDate)
+    {
+        _logger.LogInformation("GetAllSales params: {fromDate}, {toDate}",
+        fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _saleStorageContract.GetList(fromDate, toDate) ?? throw new
+        NullListException();
+    }
+    public List<SaleDataModel> GetAllSalesByWorkerByPeriod(string workerId,
+    DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSales 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 _saleStorageContract.GetList(fromDate, toDate, workerId:
+        workerId) ?? throw new NullListException();
+    }
+    public List<SaleDataModel> GetAllSalesByBuyerByPeriod(string buyerId,
+    DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSales params: {buyerId}, {fromDate}, { toDate}", buyerId, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (buyerId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(buyerId));
+        }
+        if (!buyerId.IsGuid())
+        {
+            throw new ValidationException("The value in the field buyerId is not a unique identifier.");
+        }
+        return _saleStorageContract.GetList(fromDate, toDate, buyerId:
+        buyerId) ?? throw new NullListException();
+    }
+    public List<SaleDataModel> GetAllSalesByProductByPeriod(string productId,
+    DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSales params: {productId}, {fromDate}, { toDate}", productId, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (productId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(productId));
+        }
+        if (!productId.IsGuid())
+        {
+            throw new ValidationException("The value in the field productId is not a unique identifier.");
+        }
+        return _saleStorageContract.GetList(fromDate, toDate, lunchId:
+        productId) ?? throw new NullListException();
+    }
+    public SaleDataModel GetSaleByData(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 _saleStorageContract.GetElementById(data) ?? throw new
+        ElementNotFoundException(data);
+    }
+    public void InsertSale(SaleDataModel saleDataModel)
+    {
+        _logger.LogInformation("New data: {json}",
+JsonSerializer.Serialize(saleDataModel));
+        ArgumentNullException.ThrowIfNull(saleDataModel);
+        saleDataModel.Validate();
+        _saleStorageContract.AddElement(saleDataModel);
+    }
+    public void CancelSale(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");
+        }
+        _saleStorageContract.DelElement(id);
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenBusinessLogic/Implementations/WorkerBusinessLogicContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenBusinessLogic/Implementations/WorkerBusinessLogicContract.cs
@@ -0,0 +1,109 @@
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.Json;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.BusinessLogicsContracts;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.Extensions;
+using ThreeFatMenContracts.StoragesContracts;
+
+namespace ThreeFatMenBusinessLogic.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);
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenBusinessLogic/ThreeFatMenBusinessLogic.csproj
+++ b/ThreeFatMenProject/ThreeFatMenBusinessLogic/ThreeFatMenBusinessLogic.csproj
@@ -0,0 +1,22 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+	<ItemGroup>
+		<InternalsVisibleTo Include="ThreeFatMenTests" />
+		<InternalsVisibleTo Include="DynamicProxyGenAssembly2" />
+	</ItemGroup>
+
+	<ItemGroup>
+	  <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="9.0.3" />
+	</ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ThreeFatMenContracts\ThreeFatMenContracts.csproj" />
+  </ItemGroup>
+
+</Project>
--- a/ThreeFatMenProject/ThreeFatMenContracts/BusinessLogicsContracts/IBuyerBusinessLogicContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/BusinessLogicsContracts/IBuyerBusinessLogicContract.cs
@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+
+namespace ThreeFatMenContracts.BusinessLogicsContracts;
+
+public interface IBuyerBusinessLogicContract
+{
+    List<BuyerDataModel> GetAllBuyers();
+
+    BuyerDataModel GetBuyerByData(string data);
+
+    void InsertBuyer(BuyerDataModel buyerDataModel);
+
+    void UpdateBuyer(BuyerDataModel buyerDataModel);
+
+    void DeleteBuyer(string id);
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/BusinessLogicsContracts/ILunchBusinessLogicContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/BusinessLogicsContracts/ILunchBusinessLogicContract.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+
+namespace ThreeFatMenContracts.BusinessLogicsContracts;
+
+public interface ILunchBusinessLogicContract
+{
+    List<LunchDataModel> GetAllLunches(bool onlyActive = true);
+    List<LunchHistoryDataModel> GetLunchHistoryByLunch(string lunchId);
+    LunchDataModel GetLunchByData(string data);
+    void InsertLunch(LunchDataModel lunchDataModel);
+    void UpdateLunch(LunchDataModel lunchDataModel);
+    void DeleteLunch(string id);
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/BusinessLogicsContracts/IPostBusinessLogicContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/BusinessLogicsContracts/IPostBusinessLogicContract.cs
@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+
+namespace ThreeFatMenContracts.BuisnessLogicsContracts;
+
+public interface IPostBusinessLogicContract
+{
+    List<PostDataModel> GetAllPosts(bool onlyActive);
+    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);
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/BusinessLogicsContracts/ISaleBusinessLogicContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/BusinessLogicsContracts/ISaleBusinessLogicContract.cs
@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+
+namespace ThreeFatMenContracts.BusinessLogicsContracts;
+
+public interface ISaleBusinessLogicContract
+{
+    List<SaleDataModel> GetAllSalesByPeriod(DateTime fromDate, DateTime toDate);
+    List<SaleDataModel> GetAllSalesByWorkerByPeriod(string workerId, DateTime fromDate, DateTime toDate);
+    List<SaleDataModel> GetAllSalesByBuyerByPeriod(string buyerId, DateTime fromDate, DateTime toDate);
+    List<SaleDataModel> GetAllSalesByProductByPeriod(string productId, DateTime fromDate, DateTime toDate);
+    SaleDataModel GetSaleByData(string data);
+    void InsertSale(SaleDataModel saleDataModel);
+    void CancelSale(string id);
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/BusinessLogicsContracts/IWorkerBusinessLogicContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/BusinessLogicsContracts/IWorkerBusinessLogicContract.cs
@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+
+namespace ThreeFatMenContracts.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);
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/DataModels/BuyerDataModel.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/DataModels/BuyerDataModel.cs
@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.Extensions;
+using ThreeFatMenContracts.Infrastructure;
+
+namespace ThreeFatMenContracts.DataModels;
+
+public class BuyerDataModel(string id, string fio, string phoneNumber, double discountSize) : IValidation
+{
+    public string Id { get; private set; } = id;
+
+    public string FIO { get; private set; } = fio;
+
+    public string PhoneNumber { get; private set; } = phoneNumber;
+
+    public double DiscountSize { get; private set; } = discountSize;
+
+    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 (PhoneNumber.IsEmpty())
+            throw new ValidationException("Field PhoneNumber is Empty");
+
+        if (!Regex.IsMatch(PhoneNumber, @"^((8|\+7)[\- ]?)?(\(?\d{3}\)?[\- ]?)?[\d\- ]{7,10}$"))
+            throw new ValidationException("Field PhoneNumber is not a phone number");
+    }
+} 
--- a/ThreeFatMenProject/ThreeFatMenContracts/DataModels/LunchDataModel.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/DataModels/LunchDataModel.cs
@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.Enums;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.Extensions;
+using ThreeFatMenContracts.Infrastructure;
+
+namespace ThreeFatMenContracts.DataModels;
+
+public class LunchDataModel(string id, string lunchName, IngredientType ingredientType, double price, bool isDeleted) : IValidation
+{
+    public string Id { get; private set; } = id;
+    public string LunchName { get; private set; } = lunchName;
+    public IngredientType IngredientType { get; private set; } = ingredientType;
+    public double Price { get; private set; } = price;
+    public bool IsDeleted { get; private set; } = isDeleted;
+    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 (LunchName.IsEmpty())
+            throw new ValidationException("Field LucnhName is empty");
+       
+        if (IngredientType == IngredientType.None)
+            throw new ValidationException("Field Ingredients is empty");
+        if (Price <= 0)
+            throw new ValidationException("Field Price is less than or equal to 0");
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/DataModels/LunchHistoryDataModel.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/DataModels/LunchHistoryDataModel.cs
@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.Extensions;
+using ThreeFatMenContracts.Infrastructure;
+
+namespace ThreeFatMenContracts.DataModels;
+
+public class LunchHistoryDataModel(string lunchId, double oldPrice) : IValidation
+{
+    public string LunchId { get; private set; } = lunchId;
+    public double OldPrice { get; private set; } = oldPrice;
+    public DateTime ChangeDate { get; private set; } = DateTime.UtcNow;
+    public void Validate()
+    {
+        if (LunchId.IsEmpty())
+            throw new ValidationException("Field DishId is empty");
+        if (!LunchId.IsGuid())
+            throw new ValidationException("The value in the field DishId is not a unique identifier");
+        if (OldPrice <= 0)
+            throw new ValidationException("Field OldPrice is less than or equal to 0");
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/DataModels/PostDataModel.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/DataModels/PostDataModel.cs
@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.Enums;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.Extensions;
+using ThreeFatMenContracts.Infrastructure;
+
+namespace ThreeFatMenContracts.DataModels;
+
+public class PostDataModel(string id,  string postName, PostType postType, bool isActual, DateTime changeDate) : IValidation
+{
+    public string Id { get; private set; } = id;
+    public string PostName { get; private set; } = postName;
+    public PostType PostType { get; private set; } = postType;
+    public bool IsActual { get; private set; } = isActual;
+    public DateTime ChangeDate { get; private set; } = changeDate;
+    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");
+    }
+
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/DataModels/SaleDataModel.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/DataModels/SaleDataModel.cs
@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.Enums;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.Extensions;
+using ThreeFatMenContracts.Infrastructure;
+
+namespace ThreeFatMenContracts.DataModels;
+
+public class SaleDataModel(string id, string workerId, string? buyerId, double sum, DiscountType discountType, double discount, bool isCancel, List<SaleLunchDataModel> lunches) : IValidation
+{
+    public string Id { get; private set; } = id;
+
+    public string WorkerId { get; private set; } = workerId;
+
+    public string? BuyerId { get; private set; } = buyerId;
+
+    public DateTime SaleDate { get; private set; } = DateTime.UtcNow;
+
+    public double Sum { get; private set; } = sum;
+
+    public DiscountType DiscountType { get; private set; } = discountType;
+
+    public double Discount { get; private set; } = discount;
+
+    public bool IsCancel { get; private set; } = isCancel;
+
+    public List<SaleLunchDataModel> Lunches { get; private set; } = lunches;
+
+    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 EmployeeId is empty");
+
+        if (!WorkerId.IsGuid())
+            throw new ValidationException("The value in the field EmployeeId is not a unique identifier");
+
+        if (!BuyerId?.IsGuid() ?? !BuyerId?.IsEmpty() ?? false)
+            throw new ValidationException("The value in the field BuyerId is not a unique identifier");
+
+        if (Sum <= 0)
+            throw new ValidationException("Field Sum is less than or equal to 0");
+
+        if ((Lunches?.Count ?? 0) == 0)
+            throw new ValidationException("The sale must include cocktails");
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/DataModels/SaleLunchDataModel.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/DataModels/SaleLunchDataModel.cs
@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.Extensions;
+using ThreeFatMenContracts.Infrastructure;
+
+namespace ThreeFatMenContracts.DataModels;
+
+public class SaleLunchDataModel(string saleId, string lunchId, int count) : IValidation
+{
+    public string SaleId { get; private set; } = saleId;
+
+    public string LunchId { get; private set; } = lunchId;
+
+    public int Count { get; private set; } = count;
+
+    public void Validate()
+    {
+        if (SaleId.IsEmpty())
+            throw new ValidationException("Field SaleId is empty");
+
+        if (!SaleId.IsGuid())
+            throw new ValidationException("The value in the field SaleId is not a unique identifier");
+
+        if (LunchId.IsEmpty())
+            throw new ValidationException("Field ProductId is empty");
+
+        if (!LunchId.IsGuid())
+            throw new ValidationException("The value in the field ProductId is not a unique identifier");
+
+        if (Count <= 0)
+            throw new ValidationException("Field Count is less than or equal to 0");
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/DataModels/WorkerDataModel.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/DataModels/WorkerDataModel.cs
@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.Extensions;
+using ThreeFatMenContracts.Infrastructure;
+
+namespace ThreeFatMenContracts.DataModels;
+
+public class WorkerDataModel(string id, string fio, string postId, DateTime birthDate, DateTime employmentDate, bool isDeleted) : IValidation
+{
+    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 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) // EmploymentDate.Year - BirthDate.Year
+            throw new ValidationException($"Minors cannot be hired (EmploymentDate - {EmploymentDate.ToShortDateString()}, BirthDate - {BirthDate.ToShortDateString()})");
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/Enums/DiscountType.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/Enums/DiscountType.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ThreeFatMenContracts.Enums;
+
+[Flags]
+public enum DiscountType
+{
+    None = 0,
+    OnSale = 1,
+    RegularCustomer = 2,
+    Certificate = 4
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/Enums/IngredientType.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/Enums/IngredientType.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ThreeFatMenContracts.Enums;
+
+[Flags]
+public enum IngredientType
+{
+    None = 0,
+    Meat = 1,
+    Fish = 2,
+    Vegetables = 4
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/Enums/PostType.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/Enums/PostType.cs
@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ThreeFatMenContracts.Enums;
+
+public enum PostType
+{
+    None = 0,
+    Administrator = 1,
+    Cook = 2,
+    Waiter = 3,
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/Exceptions/ElementExistsException.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/Exceptions/ElementExistsException.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ThreeFatMenContracts.Exceptions;
+
+public class ElementExistsException : Exception
+{
+    public string ParamName { get; private set; }
+    public string ParamValue { get; private set; }
+    public ElementExistsException(string paramName, string paramValue) : base($"There is already an element with value{paramValue} of parameter {paramName}")
+    {
+        ParamName = paramName;
+        ParamValue = paramValue;
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/Exceptions/ElementNotFoundException.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/Exceptions/ElementNotFoundException.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ThreeFatMenContracts.Exceptions;
+
+public class ElementNotFoundException : Exception
+{
+    public string Value { get; private set; }
+    public ElementNotFoundException(string value) : base($"Element not found at value = {value}")
+    {
+        Value = value;
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/Exceptions/IncorrectDatesException.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/Exceptions/IncorrectDatesException.cs
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ThreeFatMenContracts.Exceptions;
+
+public class IncorrectDatesException : Exception
+{
+    public IncorrectDatesException(DateTime start, DateTime end) : base($@"The end date must be later than the start date..StartDate: {start: dd.MM.YYYY}. EndDate: {end:dd.MM.YYYY}") { }
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/Exceptions/NullListException.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/Exceptions/NullListException.cs
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ThreeFatMenContracts.Exceptions;
+
+public class NullListException : Exception
+{
+    public NullListException() : base("The returned list is null") { }
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/Exceptions/StorageException.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/Exceptions/StorageException.cs
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ThreeFatMenContracts.Exceptions;
+
+public class StorageException : Exception
+{
+    public StorageException(Exception ex) : base($"Error while working in storage: {ex.Message}", ex) { }
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/Exceptions/ValidationException.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/Exceptions/ValidationException.cs
@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ThreeFatMenContracts.Exceptions;
+
+public class ValidationException(string message) : Exception(message)
+{
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/Extensions/DateTimeExtensions.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/Extensions/DateTimeExtensions.cs
@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ThreeFatMenContracts.Extensions;
+
+public static class DateTimeExtensions
+{
+    public static bool IsDateNotOlder(this DateTime date, DateTime olderDate)
+    {
+        return date >= olderDate;
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/Extensions/StringExtensions.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/Extensions/StringExtensions.cs
@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ThreeFatMenContracts.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 _);
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/Infrastructure/IValidation.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/Infrastructure/IValidation.cs
@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ThreeFatMenContracts.Infrastructure;
+
+public interface IValidation
+{
+    void Validate();
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/StoragesContracts/IBuyerStorageContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/StoragesContracts/IBuyerStorageContract.cs
@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+
+namespace ThreeFatMenContracts.StoragesContracts;
+
+public interface IBuyerStorageContract
+{
+    List<BuyerDataModel> GetList();
+    BuyerDataModel? GetElementById(string id);
+    BuyerDataModel? GetElementByPhoneNumber(string phoneNumber);
+    BuyerDataModel? GetElementByFIO(string fio);
+    void AddElement(BuyerDataModel buyerDataModel);
+    void UpdElement(BuyerDataModel buyerDataModel);
+    void DelElement(string id);
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/StoragesContracts/ILunchStorageContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/StoragesContracts/ILunchStorageContract.cs
@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+
+namespace ThreeFatMenContracts.StoragesContracts;
+
+public interface ILunchStorageContract
+{
+    List<LunchDataModel> GetList(bool onlyActive = true);
+
+    List<LunchHistoryDataModel> GetHistoryByLunchId(string lunchId);
+
+    LunchDataModel? GetElementById(string id);
+
+    LunchDataModel? GetElementByName(string name);
+
+    void AddElement(LunchDataModel lunchDataModel);
+
+    void UpdElement(LunchDataModel lunchDataModel);
+
+    void DelElement(string id);
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/StoragesContracts/IPostStorageContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/StoragesContracts/IPostStorageContract.cs
@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+
+namespace ThreeFatMenContracts.StoragesContracts;
+
+public interface IPostStorageContract
+{
+    List<PostDataModel> GetList(bool onlyActual = true);
+    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);
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/StoragesContracts/ISaleStorageContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/StoragesContracts/ISaleStorageContract.cs
@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+
+namespace ThreeFatMenContracts.StoragesContracts;
+
+public interface ISaleStorageContract
+{
+ 
+     List<SaleDataModel> GetList(DateTime? startDate = null, DateTime? endDate = null, string? workerId = null, string? buyerId = null, string? lunchId = null);
+
+     SaleDataModel? GetElementById(string id);
+
+     void AddElement(SaleDataModel saleDataModel);
+
+     void DelElement(string id);
+    
+}
--- a/ThreeFatMenProject/ThreeFatMenContracts/StoragesContracts/IWorkerStorageContract.cs
+++ b/ThreeFatMenProject/ThreeFatMenContracts/StoragesContracts/IWorkerStorageContract.cs
@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+
+namespace ThreeFatMenContracts.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);
+}
--- a/ThreeFatMenProject/ThreeFatMenProject.sln
+++ b/ThreeFatMenProject/ThreeFatMenProject.sln
@@ -1,10 +1,14 @@

 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
-VisualStudioVersion = 17.12.35707.178 d17.12
+VisualStudioVersion = 17.12.35707.178
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ThreeFatMenContracts", "ThreeFatMenContracts\ThreeFatMenContracts.csproj", "{DE3F0625-08C6-4A14-BF98-745334E1D5AB}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ThreeFatMenTests", "ThreeFatMenTests\ThreeFatMenTests.csproj", "{A37EA18A-E569-4528-ADCC-EE1EC74523A8}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ThreeFatMenBusinessLogic", "ThreeFatMenBusinessLogic\ThreeFatMenBusinessLogic.csproj", "{12309C22-2123-4AFC-A601-8EDA2BCE9603}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -15,6 +19,14 @@ Global
 		{DE3F0625-08C6-4A14-BF98-745334E1D5AB}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{DE3F0625-08C6-4A14-BF98-745334E1D5AB}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{DE3F0625-08C6-4A14-BF98-745334E1D5AB}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A37EA18A-E569-4528-ADCC-EE1EC74523A8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A37EA18A-E569-4528-ADCC-EE1EC74523A8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A37EA18A-E569-4528-ADCC-EE1EC74523A8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A37EA18A-E569-4528-ADCC-EE1EC74523A8}.Release|Any CPU.Build.0 = Release|Any CPU
+		{12309C22-2123-4AFC-A601-8EDA2BCE9603}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{12309C22-2123-4AFC-A601-8EDA2BCE9603}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{12309C22-2123-4AFC-A601-8EDA2BCE9603}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{12309C22-2123-4AFC-A601-8EDA2BCE9603}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
--- a/ThreeFatMenProject/ThreeFatMenTests/BusinessLogicsContractsTests/BuyerBusinessLogicContractTests.cs
+++ b/ThreeFatMenProject/ThreeFatMenTests/BusinessLogicsContractsTests/BuyerBusinessLogicContractTests.cs
@@ -0,0 +1,355 @@
+using Microsoft.Extensions.Logging;
+using Moq;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenBusinessLogic.Implementations;
+using ThreeFatMenContracts.BusinessLogicsContracts;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.StoragesContracts;
+
+
+
+namespace ThreeFatMenTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+internal class BuyerBusinessLogicContractTests
+{
+    private IBuyerBusinessLogicContract _buyerBusinessLogicContract;
+    private Mock<IBuyerStorageContract> _buyerStorageContract;
+
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        _buyerStorageContract = new Mock<IBuyerStorageContract>();
+        _buyerBusinessLogicContract = new BuyerBusinessLogicContract(_buyerStorageContract.Object, new Mock<ILogger>().Object);
+    }
+
+    [SetUp]
+    public void SetUp()
+    {
+        _buyerStorageContract.Reset();
+    }
+
+    [Test]
+    public void GetAllBuyers_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var listOriginal = new List<BuyerDataModel>()
+{
+        new(Guid.NewGuid().ToString(), "fio 1", "+7-111-111-11-11", 0),
+        new(Guid.NewGuid().ToString(), "fio 2", "+7-555-444-33-23", 10),
+        new(Guid.NewGuid().ToString(), "fio 3", "+7-777-777-7777", 0),};
+        _buyerStorageContract.Setup(x => x.GetList()).Returns(listOriginal);
+        //Act
+        var list = _buyerBusinessLogicContract.GetAllBuyers();
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+    }
+
+    [Test]
+    public void GetAllBuyers_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x => x.GetList()).Returns([]);
+        //Act
+        var list = _buyerBusinessLogicContract.GetAllBuyers();
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _buyerStorageContract.Verify(x => x.GetList(), Times.Once);
+    }
+
+    [Test]
+    public void GetAllBuyers_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.GetAllBuyers(),Throws.TypeOf<NullListException>());
+        _buyerStorageContract.Verify(x => x.GetList(), Times.Once);
+    }
+
+    [Test]
+    public void GetAllBuyers_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x => x.GetList()).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.GetAllBuyers(),Throws.TypeOf<StorageException>());
+        _buyerStorageContract.Verify(x => x.GetList(), Times.Once);
+    }
+
+    [Test]
+    public void GetBuyerByData_GetById_ReturnRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var record = new BuyerDataModel(id, "fio", "+7-111-111-11-11", 0);
+        _buyerStorageContract.Setup(x => x.GetElementById(id)).Returns(record);
+        //Act
+        var element = _buyerBusinessLogicContract.GetBuyerByData(id);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.Id, Is.EqualTo(id));
+        _buyerStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetBuyerByData_GetByFio_ReturnRecord_Test()
+    {
+        //Arrange
+        var fio = "fio";
+        var record = new BuyerDataModel(Guid.NewGuid().ToString(), fio, "+7 - 111 - 111 - 11 - 11", 0);
+        _buyerStorageContract.Setup(x =>x.GetElementByFIO(fio)).Returns(record);
+        //Act
+        var element = _buyerBusinessLogicContract.GetBuyerByData(fio);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.FIO, Is.EqualTo(fio));
+        _buyerStorageContract.Verify(x =>x.GetElementByFIO(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetBuyerByData_GetByPhoneNumber_ReturnRecord_Test()
+    {
+        //Arrange
+        var phoneNumber = "+7-111-111-11-11";
+        var record = new BuyerDataModel(Guid.NewGuid().ToString(), "fio",phoneNumber, 0);
+        _buyerStorageContract.Setup(x =>x.GetElementByPhoneNumber(phoneNumber)).Returns(record);
+        //Act
+        var element = _buyerBusinessLogicContract.GetBuyerByData(phoneNumber);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.PhoneNumber, Is.EqualTo(phoneNumber));
+        _buyerStorageContract.Verify(x => x.GetElementByPhoneNumber(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetBuyerByData_EmptyData_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.GetBuyerByData(null), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _buyerBusinessLogicContract.GetBuyerByData(string.Empty), Throws.TypeOf<ArgumentNullException>());
+        _buyerStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Never);
+        _buyerStorageContract.Verify(x => x.GetElementByPhoneNumber(It.IsAny<string>()), Times.Never);
+        _buyerStorageContract.Verify(x => x.GetElementByFIO(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetBuyerByData_GetById_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.GetBuyerByData(Guid.NewGuid().ToString()), Throws.TypeOf<ElementNotFoundException>());
+        _buyerStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+        _buyerStorageContract.Verify(x =>x.GetElementByPhoneNumber(It.IsAny<string>()), Times.Never);
+        _buyerStorageContract.Verify(x =>x.GetElementByFIO(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetBuyerByData_GetByFio_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.GetBuyerByData("fio"), Throws.TypeOf<ElementNotFoundException>());
+        _buyerStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Never);
+        _buyerStorageContract.Verify(x =>x.GetElementByFIO(It.IsAny<string>()), Times.Once);
+        _buyerStorageContract.Verify(x =>x.GetElementByPhoneNumber(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void
+    GetBuyerByData_GetByPhoneNumber_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.GetBuyerByData("+7-111-111-11-12"), Throws.TypeOf<ElementNotFoundException>());
+        _buyerStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Never);
+        _buyerStorageContract.Verify(x => x.GetElementByFIO(It.IsAny<string>()), Times.Never);
+        _buyerStorageContract.Verify(x => x.GetElementByPhoneNumber(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetBuyerByData_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x => x.GetElementById(It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+        _buyerStorageContract.Setup(x => x.GetElementByFIO(It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+        _buyerStorageContract.Setup(x => x.GetElementByPhoneNumber(It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.GetBuyerByData(Guid.NewGuid().ToString()),Throws.TypeOf<StorageException>());
+        Assert.That(() => _buyerBusinessLogicContract.GetBuyerByData("Фамилия Имя Отчество"),Throws.TypeOf<StorageException>());
+        Assert.That(() => _buyerBusinessLogicContract.GetBuyerByData("+7-111-111-11-12"), Throws.TypeOf<StorageException>());
+        _buyerStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+        _buyerStorageContract.Verify(x => x.GetElementByFIO(It.IsAny<string>()), Times.Once);
+        _buyerStorageContract.Verify(x => x.GetElementByPhoneNumber(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void InsertBuyer_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new BuyerDataModel(Guid.NewGuid().ToString(), "Фамилия Имя Отчество", "+7-111-111-11-11", 10);
+        _buyerStorageContract.Setup(x => x.AddElement(It.IsAny<BuyerDataModel>())).Callback((BuyerDataModel x) =>
+        {
+            flag = x.Id == record.Id && x.FIO == record.FIO && x.PhoneNumber == record.PhoneNumber && x.DiscountSize == record.DiscountSize;
+        });
+        //Act
+        _buyerBusinessLogicContract.InsertBuyer(record);
+        //Assert
+        _buyerStorageContract.Verify(x => x.AddElement(It.IsAny<BuyerDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+
+    [Test]
+    public void InsertBuyer_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x => x.AddElement(It.IsAny<BuyerDataModel>())).Throws(new ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.InsertBuyer(new(Guid.NewGuid().ToString(), "Фамилия Имя Отчество", "+7-111-111-11-11", 0)), Throws.TypeOf<ElementExistsException>());
+        _buyerStorageContract.Verify(x => x.AddElement(It.IsAny<BuyerDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void InsertBuyer_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.InsertBuyer(null),
+        Throws.TypeOf<ArgumentNullException>());
+        _buyerStorageContract.Verify(x => x.AddElement(It.IsAny<BuyerDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void InsertBuyer_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.InsertBuyer(new BuyerDataModel("id", "fio", "+7-111-111-11-11", 10)),
+        Throws.TypeOf<ValidationException>());
+        _buyerStorageContract.Verify(x => x.AddElement(It.IsAny<BuyerDataModel>()), Times.Never);
+    }
+    [Test]
+    public void InsertBuyer_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x => x.AddElement(It.IsAny<BuyerDataModel>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>_buyerBusinessLogicContract.InsertBuyer(new(Guid.NewGuid().ToString(), "Фамилия Имя Отчество", "+7-111-111-11-11", 0)), Throws.TypeOf<StorageException>());
+        _buyerStorageContract.Verify(x =>x.AddElement(It.IsAny<BuyerDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void UpdateBuyer_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new BuyerDataModel(Guid.NewGuid().ToString(), "Фамилия Имя Отчество", "+7-111-111-11-11", 0);
+        _buyerStorageContract.Setup(x => x.UpdElement(It.IsAny<BuyerDataModel>()))
+        .Callback((BuyerDataModel x) =>
+        {
+            flag = x.Id == record.Id && x.FIO == record.FIO && x.PhoneNumber == record.PhoneNumber && x.DiscountSize == record.DiscountSize;
+        });
+        //Act
+        _buyerBusinessLogicContract.UpdateBuyer(record);
+        //Assert
+        _buyerStorageContract.Verify(x => x.UpdElement(It.IsAny<BuyerDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void UpdateBuyer_RecordWithIncorrectData_ThrowException_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x => x.UpdElement(It.IsAny<BuyerDataModel>())).Throws(new
+        ElementNotFoundException(""));
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.UpdateBuyer(new(Guid.NewGuid().ToString(), "Фамилия Имя Отчество", "+7-111-111-11-11", 0)), Throws.TypeOf<ElementNotFoundException>());
+        _buyerStorageContract.Verify(x => x.UpdElement(It.IsAny<BuyerDataModel>()), Times.Once);
+    }
+    [Test]
+    public void UpdateBuyer_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x => x.UpdElement(It.IsAny<BuyerDataModel>())).Throws(new ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() =>_buyerBusinessLogicContract.UpdateBuyer(new(Guid.NewGuid().ToString(), "Фамилия Имя Отчество", "+7-111-111-11-11", 0)), Throws.TypeOf<ElementExistsException>());
+        _buyerStorageContract.Verify(x => x.UpdElement(It.IsAny<BuyerDataModel>()), Times.Once);
+    }
+    [Test]
+    public void UpdateBuyer_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.UpdateBuyer(null),
+        Throws.TypeOf<ArgumentNullException>());
+        _buyerStorageContract.Verify(x => x.UpdElement(It.IsAny<BuyerDataModel>()), Times.Never);
+    }
+    [Test]
+    public void UpdateBuyer_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.UpdateBuyer(new BuyerDataModel("id", "fio", "+7-111-111-11-11", 10)),
+        Throws.TypeOf<ValidationException>());
+        _buyerStorageContract.Verify(x => x.UpdElement(It.IsAny<BuyerDataModel>()), Times.Never);
+    }
+    [Test]
+    public void UpdateBuyer_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x =>x.UpdElement(It.IsAny<BuyerDataModel>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>_buyerBusinessLogicContract.UpdateBuyer(new(Guid.NewGuid().ToString(), "Фамилия Имя Отчество", "+7-111-111-11-11", 0)), Throws.TypeOf<StorageException>());
+        _buyerStorageContract.Verify(x =>x.UpdElement(It.IsAny<BuyerDataModel>()), Times.Once);
+    }
+    [Test]
+    public void DeleteBuyer_CorrectRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var flag = false;
+        _buyerStorageContract.Setup(x => x.DelElement(It.Is((string x) => x == id))).Callback(() => { flag = true; });
+        //Act
+        _buyerBusinessLogicContract.DeleteBuyer(id);
+        //Assert
+        _buyerStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void DeleteBuyer_RecordWithIncorrectId_ThrowException_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x => x.DelElement(It.IsAny<string>())).Throws(new ElementNotFoundException(""));
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.DeleteBuyer(Guid.NewGuid().ToString()),
+        Throws.TypeOf<ElementNotFoundException>());
+        _buyerStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),Times.Once);
+    }
+    [Test]
+    public void DeleteBuyer_IdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.DeleteBuyer(null),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _buyerBusinessLogicContract.DeleteBuyer(string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _buyerStorageContract.Verify(x => x.DelElement(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void DeleteBuyer_IdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.DeleteBuyer("id"),
+        Throws.TypeOf<ValidationException>());
+        _buyerStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),Times.Never);
+    }
+    [Test]
+    public void DeleteBuyer_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x => x.DelElement(It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.DeleteBuyer(Guid.NewGuid().ToString()),
+        Throws.TypeOf<StorageException>());
+        _buyerStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),Times.Once);
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenTests/BusinessLogicsContractsTests/LunchBusinessLogicContractTests.cs
+++ b/ThreeFatMenProject/ThreeFatMenTests/BusinessLogicsContractsTests/LunchBusinessLogicContractTests.cs
@@ -0,0 +1,446 @@
+using Microsoft.Extensions.Logging;
+using Moq;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenBusinessLogic.Implementations;
+using ThreeFatMenContracts.BusinessLogicsContracts;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Enums;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.StoragesContracts;
+
+namespace ThreeFatMenTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+internal class LunchBusinessLogicContractTests
+{
+    private ILunchBusinessLogicContract _lunchBusinessLogicContract;
+    private Mock<ILunchStorageContract> _lunchStorageContract;
+    private Mock<ILogger> _logger;
+
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        _lunchStorageContract = new Mock<ILunchStorageContract>();
+        _logger = new Mock<ILogger>();
+        _lunchBusinessLogicContract = new LunchBusinessLogicContract(_lunchStorageContract.Object, _logger.Object);
+    }
+
+    [SetUp]
+    public void SetUp()
+    {
+        _lunchStorageContract.Reset();
+    }
+
+    [Test]
+    public void GetAllLunches_ReturnListOfRecords_Test()
+    {
+        // Arrange
+        var listOriginal = new List<LunchDataModel>
+    {
+        new(Guid.NewGuid().ToString(), "Lunch 1", IngredientType.Fish, 10.0, false),
+        new(Guid.NewGuid().ToString(), "Lunch 2", IngredientType.Fish, 10.0, true),
+        new(Guid.NewGuid().ToString(), "Lunch 3", IngredientType.Fish, 20.0, false),
+    };
+
+        // Ensure the mock returns the correct list based on the parameter
+        _lunchStorageContract.Setup(x => x.GetList(true)).Returns(listOriginal.Where(l => !l.IsDeleted).ToList());
+        _lunchStorageContract.Setup(x => x.GetList(false)).Returns(listOriginal);
+
+        // Act
+        var listOnlyActive = _lunchBusinessLogicContract.GetAllLunches(true);
+        var list = _lunchBusinessLogicContract.GetAllLunches(false);
+
+        // Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null);
+            Assert.That(list, Is.Not.Null);
+            Assert.That(listOnlyActive, Is.EquivalentTo(listOriginal.Where(l => !l.IsDeleted)));
+            Assert.That(list, Is.EquivalentTo(listOriginal));
+        });
+
+        _lunchStorageContract.Verify(x => x.GetList(true), Times.Once);
+        _lunchStorageContract.Verify(x => x.GetList(false), Times.Once);
+    }
+
+    [Test]
+    public void GetAllLunches_ReturnEmptyList_Test()
+    {
+        // Arrange
+        _lunchStorageContract.Setup(x => x.GetList(It.IsAny<bool>())).Returns(new List<LunchDataModel>());
+
+        // Act
+        var listOnlyActive = _lunchBusinessLogicContract.GetAllLunches(true);
+        var list = _lunchBusinessLogicContract.GetAllLunches(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));
+        });
+        _lunchStorageContract.Verify(x => x.GetList(It.IsAny<bool>()), Times.Exactly(2));
+    }
+
+    [Test]
+    public void GetAllLunches_ReturnNull_ThrowException_Test()
+    {
+        // Arrange
+        _lunchStorageContract.Setup(x => x.GetList(It.IsAny<bool>())).Returns((List<LunchDataModel>)null);
+
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.GetAllLunches(It.IsAny<bool>()), Throws.TypeOf<NullListException>());
+        _lunchStorageContract.Verify(x => x.GetList(It.IsAny<bool>()), Times.Once);
+    }
+
+    [Test]
+    public void GetAllLunches_StorageThrowError_ThrowException_Test()
+    {
+        // Arrange
+        _lunchStorageContract.Setup(x => x.GetList(It.IsAny<bool>())).Throws(new StorageException(new InvalidOperationException()));
+
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.GetAllLunches(It.IsAny<bool>()), Throws.TypeOf<StorageException>());
+        _lunchStorageContract.Verify(x => x.GetList(It.IsAny<bool>()), Times.Once);
+    }
+
+    [Test]
+    public void GetLunchHistoryByLunch_ReturnListOfRecords_Test()
+    {
+        // Arrange
+        var lunchId = Guid.NewGuid().ToString();
+        var listOriginal = new List<LunchHistoryDataModel>
+        {
+            new(lunchId, 10.0),
+            new(lunchId, 15.0),
+            new(lunchId, 20.0),
+        };
+        _lunchStorageContract.Setup(x => x.GetHistoryByLunchId(It.IsAny<string>())).Returns(listOriginal);
+
+        // Act
+        var list = _lunchBusinessLogicContract.GetLunchHistoryByLunch(lunchId);
+
+        // Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+        _lunchStorageContract.Verify(x => x.GetHistoryByLunchId(lunchId), Times.Once);
+    }
+
+    
+
+    [Test]
+    public void GetLunchHistoryByLunch_ReturnEmptyList_Test()
+    {
+        // Arrange
+        _lunchStorageContract.Setup(x => x.GetHistoryByLunchId(It.IsAny<string>())).Returns(new List<LunchHistoryDataModel>());
+
+        // Act
+        var list = _lunchBusinessLogicContract.GetLunchHistoryByLunch(Guid.NewGuid().ToString());
+
+        // Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _lunchStorageContract.Verify(x => x.GetHistoryByLunchId(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetLunchHistoryByLunch_LunchIdIsNullOrEmpty_ThrowException_Test()
+    {
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.GetLunchHistoryByLunch(null), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _lunchBusinessLogicContract.GetLunchHistoryByLunch(string.Empty), Throws.TypeOf<ArgumentNullException>());
+        _lunchStorageContract.Verify(x => x.GetHistoryByLunchId(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetLunchHistoryByLunch_LunchIdIsNotGuid_ThrowException_Test()
+    {
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.GetLunchHistoryByLunch("lunchId"), Throws.TypeOf<ValidationException>());
+        _lunchStorageContract.Verify(x => x.GetHistoryByLunchId(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetLunchHistoryByLunch_ReturnNull_ThrowException_Test()
+    {
+        // Arrange
+        _lunchStorageContract.Setup(x => x.GetHistoryByLunchId(It.IsAny<string>())).Returns((List<LunchHistoryDataModel>)null);
+
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.GetLunchHistoryByLunch(Guid.NewGuid().ToString()), Throws.TypeOf<NullListException>());
+        _lunchStorageContract.Verify(x => x.GetHistoryByLunchId(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetLunchHistoryByLunch_StorageThrowError_ThrowException_Test()
+    {
+        // Arrange
+        _lunchStorageContract.Setup(x => x.GetHistoryByLunchId(It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.GetLunchHistoryByLunch(Guid.NewGuid().ToString()), Throws.TypeOf<StorageException>());
+        _lunchStorageContract.Verify(x => x.GetHistoryByLunchId(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetLunchByData_GetById_ReturnRecord_Test()
+    {
+        // Arrange
+        var id = Guid.NewGuid().ToString();
+        var record = new LunchDataModel(id, "LunchName", IngredientType.Fish, 10.0, false);
+        _lunchStorageContract.Setup(x => x.GetElementById(id)).Returns(record);
+
+        // Act
+        var element = _lunchBusinessLogicContract.GetLunchByData(id);
+
+        // Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.Id, Is.EqualTo(id));
+        _lunchStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetLunchByData_GetByName_ReturnRecord_Test()
+    {
+        // Arrange
+        var name = "LunchName";
+        var record = new LunchDataModel(Guid.NewGuid().ToString(), name, IngredientType.Fish, 10.0, false);
+        _lunchStorageContract.Setup(x => x.GetElementByName(name)).Returns(record);
+
+        // Act
+        var element = _lunchBusinessLogicContract.GetLunchByData(name);
+
+        // Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.LunchName, Is.EqualTo(name));
+        _lunchStorageContract.Verify(x => x.GetElementByName(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetLunchByData_EmptyData_ThrowException_Test()
+    {
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.GetLunchByData(null), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _lunchBusinessLogicContract.GetLunchByData(string.Empty), Throws.TypeOf<ArgumentNullException>());
+        _lunchStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Never);
+        _lunchStorageContract.Verify(x => x.GetElementByName(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetLunchByData_GetById_NotFoundRecord_ThrowException_Test()
+    {
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.GetLunchByData(Guid.NewGuid().ToString()), Throws.TypeOf<ElementNotFoundException>());
+        _lunchStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetLunchByData_GetByName_NotFoundRecord_ThrowException_Test()
+    {
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.GetLunchByData("LunchName"), Throws.TypeOf<ElementNotFoundException>());
+        _lunchStorageContract.Verify(x => x.GetElementByName(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetLunchByData_StorageThrowError_ThrowException_Test()
+    {
+        // Arrange
+        _lunchStorageContract.Setup(x => x.GetElementById(It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+        _lunchStorageContract.Setup(x => x.GetElementByName(It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.GetLunchByData(Guid.NewGuid().ToString()), Throws.TypeOf<StorageException>());
+        Assert.That(() => _lunchBusinessLogicContract.GetLunchByData("LunchName"), Throws.TypeOf<StorageException>());
+        _lunchStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+        _lunchStorageContract.Verify(x => x.GetElementByName(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void InsertLunch_CorrectRecord_Test()
+    {
+        // Arrange
+        var flag = false;
+        var record = new LunchDataModel(Guid.NewGuid().ToString(), "LunchName", IngredientType.Fish, 10.0, false);
+        _lunchStorageContract.Setup(x => x.AddElement(It.IsAny<LunchDataModel>()))
+            .Callback((LunchDataModel x) =>
+            {
+                flag = x.Id == record.Id && x.LunchName == record.LunchName && x.IngredientType == record.IngredientType && x.Price == record.Price && x.IsDeleted == record.IsDeleted;
+            });
+
+        // Act
+        _lunchBusinessLogicContract.InsertLunch(record);
+
+        // Assert
+        _lunchStorageContract.Verify(x => x.AddElement(It.IsAny<LunchDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+
+    [Test]
+    public void InsertLunch_RecordWithExistsData_ThrowException_Test()
+    {
+        // Arrange
+        _lunchStorageContract.Setup(x => x.AddElement(It.IsAny<LunchDataModel>())).Throws(new ElementExistsException("Data", "Data"));
+
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.InsertLunch(new LunchDataModel(Guid.NewGuid().ToString(), "LunchName", IngredientType.Fish, 10.0, false)), Throws.TypeOf<ElementExistsException>());
+        _lunchStorageContract.Verify(x => x.AddElement(It.IsAny<LunchDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void InsertLunch_NullRecord_ThrowException_Test()
+    {
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.InsertLunch(null), Throws.TypeOf<ArgumentNullException>());
+        _lunchStorageContract.Verify(x => x.AddElement(It.IsAny<LunchDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void InsertLunch_InvalidRecord_ThrowException_Test()
+    {
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.InsertLunch(new LunchDataModel("id", "LunchName", IngredientType.Fish, 10.0, false)), Throws.TypeOf<ValidationException>());
+        _lunchStorageContract.Verify(x => x.AddElement(It.IsAny<LunchDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void InsertLunch_StorageThrowError_ThrowException_Test()
+    {
+        // Arrange
+        _lunchStorageContract.Setup(x => x.AddElement(It.IsAny<LunchDataModel>())).Throws(new StorageException(new InvalidOperationException()));
+
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.InsertLunch(new LunchDataModel(Guid.NewGuid().ToString(), "LunchName", IngredientType.Fish, 10.0, false)), Throws.TypeOf<StorageException>());
+        _lunchStorageContract.Verify(x => x.AddElement(It.IsAny<LunchDataModel>()), Times.Once);
+    }
+    [Test]
+    public void UpdateLunch_CorrectRecord_Test()
+    {
+        // Arrange
+        var flag = false;
+        var record = new LunchDataModel(Guid.NewGuid().ToString(), "LunchName", IngredientType.Fish, 10.0, false);
+        _lunchStorageContract.Setup(x => x.UpdElement(It.IsAny<LunchDataModel>()))
+            .Callback((LunchDataModel x) =>
+            {
+                flag = x.Id == record.Id && x.LunchName == record.LunchName && x.IngredientType == record.IngredientType && x.Price == record.Price && x.IsDeleted == record.IsDeleted;
+            });
+
+        // Act
+        _lunchBusinessLogicContract.UpdateLunch(record);
+
+        // Assert
+        _lunchStorageContract.Verify(x => x.UpdElement(It.IsAny<LunchDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+
+    [Test]
+    public void UpdateLunch_RecordWithIncorrectData_ThrowException_Test()
+    {
+        // Arrange
+        _lunchStorageContract.Setup(x => x.UpdElement(It.IsAny<LunchDataModel>())).Throws(new ElementNotFoundException(""));
+
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.UpdateLunch(new LunchDataModel(Guid.NewGuid().ToString(), "LunchName", IngredientType.Fish, 10.0, false)), Throws.TypeOf<ElementNotFoundException>());
+        _lunchStorageContract.Verify(x => x.UpdElement(It.IsAny<LunchDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void UpdateLunch_RecordWithExistsData_ThrowException_Test()
+    {
+        // Arrange
+        _lunchStorageContract.Setup(x => x.UpdElement(It.IsAny<LunchDataModel>())).Throws(new ElementExistsException("Data", "Data"));
+
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.UpdateLunch(new LunchDataModel(Guid.NewGuid().ToString(), "LunchName", IngredientType.Fish, 10.0, false)), Throws.TypeOf<ElementExistsException>());
+        _lunchStorageContract.Verify(x => x.UpdElement(It.IsAny<LunchDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void UpdateLunch_NullRecord_ThrowException_Test()
+    {
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.UpdateLunch(null), Throws.TypeOf<ArgumentNullException>());
+        _lunchStorageContract.Verify(x => x.UpdElement(It.IsAny<LunchDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void UpdateLunch_InvalidRecord_ThrowException_Test()
+    {
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.UpdateLunch(new LunchDataModel("id", "LunchName", IngredientType.Fish, 10.0, false)), Throws.TypeOf<ValidationException>());
+        _lunchStorageContract.Verify(x => x.UpdElement(It.IsAny<LunchDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void UpdateLunch_StorageThrowError_ThrowException_Test()
+    {
+        // Arrange
+        _lunchStorageContract.Setup(x => x.UpdElement(It.IsAny<LunchDataModel>())).Throws(new StorageException(new InvalidOperationException()));
+
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.UpdateLunch(new LunchDataModel(Guid.NewGuid().ToString(), "LunchName", IngredientType.Fish, 10.0, false)), Throws.TypeOf<StorageException>());
+        _lunchStorageContract.Verify(x => x.UpdElement(It.IsAny<LunchDataModel>()), Times.Once);
+    }
+    [Test]
+    public void DeleteLunch_CorrectRecord_Test()
+    {
+        // Arrange
+        var id = Guid.NewGuid().ToString();
+        var flag = false;
+        _lunchStorageContract.Setup(x => x.DelElement(It.Is<string>(x => x == id))).Callback(() => { flag = true; });
+
+        // Act
+        _lunchBusinessLogicContract.DeleteLunch(id);
+
+        // Assert
+        _lunchStorageContract.Verify(x => x.DelElement(It.IsAny<string>()), Times.Once);
+        Assert.That(flag);
+    }
+
+    [Test]
+    public void DeleteLunch_RecordWithIncorrectId_ThrowException_Test()
+    {
+        // Arrange
+        var id = Guid.NewGuid().ToString();
+        _lunchStorageContract.Setup(x => x.DelElement(It.IsAny<string>())).Throws(new ElementNotFoundException(id));
+
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.DeleteLunch(Guid.NewGuid().ToString()), Throws.TypeOf<ElementNotFoundException>());
+        _lunchStorageContract.Verify(x => x.DelElement(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void DeleteLunch_IdIsNullOrEmpty_ThrowException_Test()
+    {
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.DeleteLunch(null), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _lunchBusinessLogicContract.DeleteLunch(string.Empty), Throws.TypeOf<ArgumentNullException>());
+        _lunchStorageContract.Verify(x => x.DelElement(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void DeleteLunch_IdIsNotGuid_ThrowException_Test()
+    {
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.DeleteLunch("id"), Throws.TypeOf<ValidationException>());
+        _lunchStorageContract.Verify(x => x.DelElement(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void DeleteLunch_StorageThrowError_ThrowException_Test()
+    {
+        // Arrange
+        _lunchStorageContract.Setup(x => x.DelElement(It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+
+        // Act & Assert
+        Assert.That(() => _lunchBusinessLogicContract.DeleteLunch(Guid.NewGuid().ToString()), Throws.TypeOf<StorageException>());
+        _lunchStorageContract.Verify(x => x.DelElement(It.IsAny<string>()), Times.Once);
+    }
+}
+
--- a/ThreeFatMenProject/ThreeFatMenTests/BusinessLogicsContractsTests/PostBusinessLogicContractTests.cs
+++ b/ThreeFatMenProject/ThreeFatMenTests/BusinessLogicsContractsTests/PostBusinessLogicContractTests.cs
@@ -0,0 +1,471 @@
+using Microsoft.Extensions.Logging;
+using Moq;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenBusinessLogic.Implementations;
+using ThreeFatMenContracts.BuisnessLogicsContracts;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Enums;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.StoragesContracts;
+
+namespace ThreeFatMenTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+public 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);
+    }
+
+    [TearDown]
+    public void TearDown()
+    {
+        _postStorageContract.Reset();
+    }
+
+    [Test]
+    public void GetAllPosts_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var listOriginal = new List<PostDataModel>()
+        {
+            new(Guid.NewGuid().ToString(),"name 1", PostType.Cook, true, DateTime.UtcNow),
+            new(Guid.NewGuid().ToString(), "name 2", PostType.Cook, true, DateTime.UtcNow),
+            new(Guid.NewGuid().ToString(), "name 3", PostType.Cook, true, DateTime.UtcNow),
+        };
+        _postStorageContract.Setup(x => x.GetList(It.IsAny<bool>())).Returns(listOriginal);
+        //Act
+        var listOnlyActive = _postBusinessLogicContract.GetAllPosts(true);
+        var listAll = _postBusinessLogicContract.GetAllPosts(false);
+        //Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(listOnlyActive, Is.Not.Null);
+            Assert.That(listAll, Is.Not.Null);
+            Assert.That(listOnlyActive, Is.EquivalentTo(listOriginal));
+            Assert.That(listAll, Is.EquivalentTo(listOriginal));
+        });
+        _postStorageContract.Verify(x => x.GetList(true), Times.Once);
+        _postStorageContract.Verify(x => x.GetList(false), Times.Once);
+    }
+
+    [Test]
+    public void GetAllPosts_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _postStorageContract.Setup(x =>
+        x.GetList(It.IsAny<bool>())).Returns([]);
+        //Act
+        var listOnlyActive = _postBusinessLogicContract.GetAllPosts(true);
+        var listAll = _postBusinessLogicContract.GetAllPosts(false);
+        //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(It.IsAny<bool>()),
+        Times.Exactly(2));
+    }
+
+    [Test]
+    public void GetAllPosts_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.GetAllPosts(It.IsAny<bool>()),
+        Throws.TypeOf<NullListException>());
+        _postStorageContract.Verify(x => x.GetList(It.IsAny<bool>()),
+        Times.Once);
+    }
+
+    [Test]
+    public void GetAllPosts_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _postStorageContract.Setup(x =>
+        x.GetList(It.IsAny<bool>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _postBusinessLogicContract.GetAllPosts(It.IsAny<bool>()),
+        Throws.TypeOf<StorageException>());
+        _postStorageContract.Verify(x => x.GetList(It.IsAny<bool>()),
+        Times.Once);
+    }
+
+    [Test]
+    public void GetAllDataOfPost_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var postId = Guid.NewGuid().ToString();
+        var listOriginal = new List<PostDataModel>()
+        {
+            new(postId, "name 1", PostType.Cook, true, DateTime.UtcNow),
+            new(postId, "name 2", PostType.Cook, true, DateTime.UtcNow)
+        };
+        _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.Cook, true, DateTime.UtcNow);
+        _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.Cook, true, DateTime.UtcNow);
+        _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.Cook, true, DateTime.UtcNow.AddDays(-1));
+        _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.ChangeDate == record.ChangeDate;
+            });
+        //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.Cook, true, DateTime.UtcNow)), 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.Cook, true, DateTime.UtcNow)), 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.Cook, true, DateTime.UtcNow)), 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.Cook, true, DateTime.UtcNow);
+        _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.ChangeDate == record.ChangeDate;
+            });
+        //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.Cook, true, DateTime.UtcNow)), 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(), "name", PostType.Cook, true, DateTime.UtcNow)), 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.Cook, true, DateTime.UtcNow)), 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.Cook, true, DateTime.UtcNow)), 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);
+    }
+}
+
+
--- a/ThreeFatMenProject/ThreeFatMenTests/BusinessLogicsContractsTests/SaleBusinessLogicContractTests.cs
+++ b/ThreeFatMenProject/ThreeFatMenTests/BusinessLogicsContractsTests/SaleBusinessLogicContractTests.cs
@@ -0,0 +1,626 @@
+using Microsoft.Extensions.Logging;
+using Moq;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenBusinessLogic.Implementations;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Enums;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.StoragesContracts;
+
+namespace ThreeFatMenTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+internal class SaleBusinessLogicContractTests
+{
+    private SaleBusinessLogicContract _saleBusinessLogicContract;
+    private Mock<ISaleStorageContract> _saleStorageContract;
+
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        _saleStorageContract = new Mock<ISaleStorageContract>();
+        _saleBusinessLogicContract = new SaleBusinessLogicContract(_saleStorageContract.Object, new Mock<ILogger>().Object);
+    }
+
+    [SetUp]
+    public void SetUp()
+    {
+        _saleStorageContract.Reset();
+    }
+    [Test]
+    public void GetAllSalesByPeriod_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        var listOriginal = new List<SaleDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, 10, DiscountType.None ,10, false, 
+                [new SaleLunchDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 300)]),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, 10, DiscountType.None ,10, false, []),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, 10, DiscountType.None, 10, false, []),
+        };
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),It.IsAny<string>())).Returns(listOriginal);
+        //Act
+        var list = _saleBusinessLogicContract.GetAllSalesByPeriod(date,date.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+        _saleStorageContract.Verify(x => x.GetList(date, date.AddDays(1),null, null, null), Times.Once);
+    }
+    [Test]
+    public void GetAllSalesByPeriod_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>())).Returns([]);
+        //Act
+        var list =
+        _saleBusinessLogicContract.GetAllSalesByPeriod(DateTime.UtcNow, DateTime.UtcNow.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllSalesByPeriod_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByPeriod(date, date),
+        Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByPeriod(date, date.AddSeconds(-1)),
+        Throws.TypeOf<IncorrectDatesException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetAllSalesByPeriod_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByPeriod(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1)), Throws.TypeOf<NullListException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllSalesByPeriod_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByPeriod(DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1)), Throws.TypeOf<StorageException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllSalesByWorkerByPeriod_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        var workerId = Guid.NewGuid().ToString();
+        var listOriginal = new List<SaleDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, 10, DiscountType.None, 10, false,
+                [new SaleLunchDataModel(Guid.NewGuid().ToString(),Guid.NewGuid().ToString(), 300)]), new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, 10, DiscountType.None,10, false, []),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, 10, DiscountType.None, 10, false, []),
+        };
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>())).Returns(listOriginal);
+        //Act
+
+        var list =
+_saleBusinessLogicContract.GetAllSalesByWorkerByPeriod(workerId, date,
+date.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+        _saleStorageContract.Verify(x => x.GetList(date, date.AddDays(1),
+        workerId, null, null), Times.Once);
+    }
+    [Test]
+    public void GetAllSalesByWorkerByPeriod_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>())).Returns([]);
+        //Act
+        var list =
+        _saleBusinessLogicContract.GetAllSalesByWorkerByPeriod(Guid.NewGuid().ToString(),
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetAllSalesByWorkerByPeriod_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByWorkerByPeriod(Guid.NewGuid().ToString(),date, date), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByWorkerByPeriod(Guid.NewGuid().ToString(),date, date.AddSeconds(-1)), Throws.TypeOf<IncorrectDatesException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void
+    GetAllSalesByWorkerByPeriod_WorkerIdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByWorkerByPeriod(null, DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1)), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByWorkerByPeriod(string.Empty,
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<ArgumentNullException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void
+GetAllSalesByWorkerByPeriod_WorkerIdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByWorkerByPeriod("workerId", DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<ValidationException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetAllSalesByWorkerByPeriod_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>_saleBusinessLogicContract.GetAllSalesByWorkerByPeriod(Guid.NewGuid().ToString(),
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<NullListException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetAllSalesByWorkerByPeriod_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByWorkerByPeriod(Guid.NewGuid().ToString(),
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1)), Throws.TypeOf<StorageException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllSalesByBuyerByPeriod_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        var buyerId = Guid.NewGuid().ToString();
+        var listOriginal = new List<SaleDataModel>()
+        {
+             new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, 10, DiscountType.None, 10, false,
+                 [new SaleLunchDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 300)]),
+             new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, 10, DiscountType.None, 10, false, []),
+             new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, 10, DiscountType.None, 10, false, []),
+        };
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+It.IsAny<string>())).Returns(listOriginal);
+        //Act
+        var list =
+        _saleBusinessLogicContract.GetAllSalesByBuyerByPeriod(buyerId, date, date.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+        _saleStorageContract.Verify(x => x.GetList(date, date.AddDays(1),
+        null, buyerId, null), Times.Once);
+    }
+    [Test]
+    public void GetAllSalesByBuyerByPeriod_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>())).Returns([]);
+        //Act
+        var list =
+        _saleBusinessLogicContract.GetAllSalesByBuyerByPeriod(Guid.NewGuid().ToString(),
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllSalesByBuyerByPeriod_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByBuyerByPeriod(Guid.NewGuid().ToString(),date, date), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByBuyerByPeriod(Guid.NewGuid().ToString(), date, date.AddSeconds(-1)), Throws.TypeOf<IncorrectDatesException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(), It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void
+    GetAllSalesByBuyerByPeriod_BuyerIdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByBuyerByPeriod(null, DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1)), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByBuyerByPeriod(string.Empty,
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<ArgumentNullException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void
+    GetAllSalesByBuyerByPeriod_BuyerIdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByBuyerByPeriod("buyerId", DateTime.UtcNow,DateTime.UtcNow.AddDays(1)), Throws.TypeOf<ValidationException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(), It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetAllSalesByBuyerByPeriod_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByBuyerByPeriod(Guid.NewGuid().ToString(),DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<NullListException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetAllSalesByBuyerByPeriod_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByBuyerByPeriod(Guid.NewGuid().ToString(),
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1)), Throws.TypeOf<StorageException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(), It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetAllSalesByProductByPeriod_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        var productId = Guid.NewGuid().ToString();
+        var listOriginal = new List<SaleDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, 10, DiscountType.None, 10, false,
+                [new SaleLunchDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 300)]),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, 10, DiscountType.None, 10, false, []),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, 10, DiscountType.None, 10, false, []),
+        };
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>())).Returns(listOriginal);
+        //Act
+        var list =
+        _saleBusinessLogicContract.GetAllSalesByProductByPeriod(productId, date, date.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+        _saleStorageContract.Verify(x => x.GetList(date, date.AddDays(1), null, null, productId), Times.Once);
+    }
+    [Test]
+    public void GetAllSalesByProductByPeriod_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>())).Returns([]);
+        //Act
+        var list =
+        _saleBusinessLogicContract.GetAllSalesByProductByPeriod(Guid.NewGuid().ToString()
+        , DateTime.UtcNow, DateTime.UtcNow.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetAllSalesByProductByPeriod_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByProductByPeriod(Guid.NewGuid().ToString()
+        , date, date), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByProductByPeriod(Guid.NewGuid().ToString()
+        , date, date.AddSeconds(-1)), Throws.TypeOf<IncorrectDatesException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void
+    GetAllSalesByProductByPeriod_ProductIdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByProductByPeriod(null, DateTime.UtcNow,
+        DateTime.UtcNow.AddDays(1)), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByProductByPeriod(string.Empty,
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+Throws.TypeOf<ArgumentNullException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void
+    GetAllSalesByProductByPeriod_ProductIdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByProductByPeriod("productId",
+        DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<ValidationException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetAllSalesByProductByPeriod_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByProductByPeriod(Guid.NewGuid().ToString()
+        , DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<NullListException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void
+    GetAllSalesByProductByPeriod_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetAllSalesByProductByPeriod(Guid.NewGuid().ToString()
+        , DateTime.UtcNow, DateTime.UtcNow.AddDays(1)),
+        Throws.TypeOf<StorageException>());
+        _saleStorageContract.Verify(x => x.GetList(It.IsAny<DateTime?>(),
+        It.IsAny<DateTime?>(), It.IsAny<string>(), It.IsAny<string>(),
+        It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetSaleByData_GetById_ReturnRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var record = new SaleDataModel(id, Guid.NewGuid().ToString(), null,10, DiscountType.None, 10, false,
+        [new SaleLunchDataModel(Guid.NewGuid().ToString(),Guid.NewGuid().ToString(), 300)]);
+        _saleStorageContract.Setup(x =>  x.GetElementById(id)).Returns(record);
+        //Act
+        var element = _saleBusinessLogicContract.GetSaleByData(id);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.Id, Is.EqualTo(id));
+        _saleStorageContract.Verify(x =>x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetSaleByData_EmptyData_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetSaleByData(null),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetSaleByData(string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _saleStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetSaleByData_IdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetSaleByData("saleId"),
+        Throws.TypeOf<ValidationException>());
+        _saleStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Never);
+    }
+    [Test]
+    public void GetSaleByData_GetById_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetSaleByData(Guid.NewGuid().ToString()),
+        Throws.TypeOf<ElementNotFoundException>());
+        _saleStorageContract.Verify(x =>
+        x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void GetSaleByData_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x => x.GetElementById(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.GetSaleByData(Guid.NewGuid().ToString()),
+        Throws.TypeOf<StorageException>());
+        _saleStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+    [Test]
+    public void InsertSale_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new SaleDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.None, 10,
+ false, [new SaleLunchDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 300)]);
+        _saleStorageContract.Setup(x => x.AddElement(It.IsAny<SaleDataModel>()))
+        .Callback((SaleDataModel x) =>
+        {
+            flag = x.Id == record.Id && x.WorkerId == record.WorkerId && x.BuyerId == record.BuyerId && x.SaleDate == record.SaleDate && x.Sum ==record.Sum && x.IsCancel == record.IsCancel && x.Lunches.Count == record.Lunches.Count &&
+    x.Lunches.First().LunchId == record.Lunches.First().LunchId && x.Lunches.First().SaleId == record.Lunches.First().SaleId && x.Lunches.First().Count == record.Lunches.First().Count;
+        });
+        //Act
+        _saleBusinessLogicContract.InsertSale(record);
+        //Assert
+        _saleStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<SaleDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void InsertSale_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x =>
+        x.AddElement(It.IsAny<SaleDataModel>())).Throws(new ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.InsertSale(new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.None, 10, false,[new SaleLunchDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 5)])), Throws.TypeOf<ElementExistsException>());
+        _saleStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<SaleDataModel>()), Times.Once);
+    }
+    [Test]
+    public void InsertSale_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.InsertSale(null),
+        Throws.TypeOf<ArgumentNullException>());
+        _saleStorageContract.Verify(x =>
+        x.AddElement(It.IsAny<SaleDataModel>()), Times.Never);
+    }
+    [Test]
+    public void InsertSale_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.InsertSale(new SaleDataModel("id", Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.None, 10, false, [])), Throws.TypeOf<ValidationException>());
+        _saleStorageContract.Verify(x =>x.AddElement(It.IsAny<SaleDataModel>()), Times.Never);
+    }
+    [Test]
+    public void InsertSale_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x =>
+        x.AddElement(It.IsAny<SaleDataModel>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.InsertSale(new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(),Guid.NewGuid().ToString(), 10, DiscountType.None, 10, false,
+        [new SaleLunchDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 300)])), Throws.TypeOf<StorageException>());
+        _saleStorageContract.Verify(x => x.AddElement(It.IsAny<SaleDataModel>()), Times.Once);
+    }
+    [Test]
+    public void CancelSale_CorrectRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var flag = false;
+        _saleStorageContract.Setup(x => x.DelElement(It.Is((string x) => x ==
+        id))).Callback(() => { flag = true; });
+        //Act
+        _saleBusinessLogicContract.CancelSale(id);
+        //Assert
+        _saleStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Once);
+        Assert.That(flag);
+    }
+    [Test]
+    public void CancelSale_RecordWithIncorrectId_ThrowException_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        _saleStorageContract.Setup(x =>
+        x.DelElement(It.IsAny<string>())).Throws(new ElementNotFoundException(id));
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.CancelSale(Guid.NewGuid().ToString()),
+        Throws.TypeOf<ElementNotFoundException>());
+        _saleStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Once);
+    }
+    [Test]
+    public void CancelSale_IdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.CancelSale(null),
+        Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() =>
+        _saleBusinessLogicContract.CancelSale(string.Empty),
+        Throws.TypeOf<ArgumentNullException>());
+        _saleStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Never);
+    }
+    [Test]
+    public void CancelSale_IdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.CancelSale("id"),
+        Throws.TypeOf<ValidationException>());
+        _saleStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Never);
+    }
+    [Test]
+    public void CancelSale_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x =>
+        x.DelElement(It.IsAny<string>())).Throws(new StorageException(new
+        InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() =>
+        _saleBusinessLogicContract.CancelSale(Guid.NewGuid().ToString()),
+        Throws.TypeOf<StorageException>());
+        _saleStorageContract.Verify(x => x.DelElement(It.IsAny<string>()),
+        Times.Once);
+    }
+}
--- a/ThreeFatMenProject/ThreeFatMenTests/BusinessLogicsContractsTests/WorkerBusinessLogicContractTests.cs
+++ b/ThreeFatMenProject/ThreeFatMenTests/BusinessLogicsContractsTests/WorkerBusinessLogicContractTests.cs
@@ -0,0 +1,691 @@
+using Microsoft.Extensions.Logging;
+using Moq;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenBusinessLogic.Implementations;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Exceptions;
+using ThreeFatMenContracts.StoragesContracts;
+
+namespace ThreeFatMenTests.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(), "Фамилия Имя Отчество", 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(), "Фамилия Имя Отчество",
+            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(), "Фамилия Имя Отчество",
+            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(), "Фамилия Имя Отчество",
+            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(), "Фамилия Имя Отчество",
+            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(), "Фамилия Имя Отчество",
+            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);
+        }
+    }
--- a/ThreeFatMenProject/ThreeFatMenTests/DataModelsTest/BuyerDataModelTests.cs
+++ b/ThreeFatMenProject/ThreeFatMenTests/DataModelsTest/BuyerDataModelTests.cs
@@ -0,0 +1,74 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Exceptions;
+
+namespace ThreeFatMenTests.DataModelsTest;
+
+[TestFixture]
+internal class BuyerDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var client = CreateDataModel(null, "fio", "number", 10);
+        Assert.That(() => client.Validate(), Throws.TypeOf<ValidationException>());
+        client = CreateDataModel(string.Empty, "fio", "number", 10);
+        Assert.That(() => client.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var client = CreateDataModel("id", "fio", "number", 10);
+        Assert.That(() => client.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void FIOIsNullOrEmptyTest()
+    {
+        var client = CreateDataModel(Guid.NewGuid().ToString(), null, "number", 10);
+        Assert.That(() => client.Validate(), Throws.TypeOf<ValidationException>());
+        client = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, "number", 10);
+        Assert.That(() => client.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PhoneNumberIsNullOrEmptyTest()
+    {
+        var client = CreateDataModel(Guid.NewGuid().ToString(), "fio", null, 10);
+        Assert.That(() => client.Validate(), Throws.TypeOf<ValidationException>());
+        client = CreateDataModel(Guid.NewGuid().ToString(), "fio", string.Empty, 10);
+        Assert.That(() => client.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PhoneNumberIsIncorrectTest()
+    {
+        var client = CreateDataModel(Guid.NewGuid().ToString(), "fio", "777", 10);
+        Assert.That(() => client.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var clientId = Guid.NewGuid().ToString();
+        var fio = "Fio";
+        var phoneNumber = "+7-777-777-77-77";
+        var discountSize = 11;
+        var buyer = CreateDataModel(clientId, fio, phoneNumber, discountSize);
+        Assert.That(() => buyer.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(buyer.Id, Is.EqualTo(clientId));
+            Assert.That(buyer.FIO, Is.EqualTo(fio));
+            Assert.That(buyer.PhoneNumber, Is.EqualTo(phoneNumber));
+            Assert.That(buyer.DiscountSize, Is.EqualTo(discountSize));
+        });
+    }
+
+    private static BuyerDataModel CreateDataModel(string? id, string? fio, string? phoneNumber, double discountSize) => new(id, fio, phoneNumber, discountSize);
+}
--- a/ThreeFatMenProject/ThreeFatMenTests/DataModelsTest/LunchDataModelTests.cs
+++ b/ThreeFatMenProject/ThreeFatMenTests/DataModelsTest/LunchDataModelTests.cs
@@ -0,0 +1,79 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Intrinsics.X86;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Enums;
+using ThreeFatMenContracts.Exceptions;
+
+namespace ThreeFatMenTests.DataModelsTest;
+[TestFixture]
+internal class LunchDataModelTests
+{
+    [Test]
+    
+    public void IdIsNullOrEmptyTest()
+    {
+        var lunch = CreateDataModel(null, "name", 10, IngredientType.Meat, false);
+        Assert.That(() => lunch.Validate(), Throws.TypeOf<ValidationException>());
+        lunch = CreateDataModel(string.Empty, "name", 10, IngredientType.Meat, false);
+        Assert.That(() => lunch.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var lunch = CreateDataModel("id", "name", 10, IngredientType.Meat, false);
+        Assert.That(() => lunch.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void LunchlNameIsNullOrEmptyTest()
+    {
+        var lunch = CreateDataModel(Guid.NewGuid().ToString(), null, 10, IngredientType.Meat, false);
+        Assert.That(() => lunch.Validate(), Throws.TypeOf<ValidationException>());
+        lunch = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, 10.5, IngredientType.Meat, false);
+        Assert.That(() => lunch.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PriceIsLessOrZeroTest()
+    {
+        var lunch = CreateDataModel(Guid.NewGuid().ToString(), null, 0, IngredientType.Meat, false);
+        Assert.That(() => lunch.Validate(), Throws.TypeOf<ValidationException>());
+        lunch = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, -10, IngredientType.Meat, false);
+        Assert.That(() => lunch.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IngredientTypeIsNoneTest()
+    {
+        var lunch = CreateDataModel(Guid.NewGuid().ToString(), null, 0, IngredientType.None, false);
+        Assert.That(() => lunch.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var lunchId = Guid.NewGuid().ToString();
+        var lunchName = "name";
+        var price = 10;
+        var ingredientType = IngredientType.Meat;
+        var lunchIsDelete = false;
+        var lunch = CreateDataModel(lunchId, lunchName, price, ingredientType, lunchIsDelete);
+        Assert.That(() => lunch.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(lunch.Id, Is.EqualTo(lunchId));
+            Assert.That(lunch.LunchName, Is.EqualTo(lunchName));
+            Assert.That(lunch.Price, Is.EqualTo(price));
+            Assert.That(lunch.IngredientType, Is.EqualTo(ingredientType));
+            Assert.That(lunch.IsDeleted, Is.EqualTo(lunchIsDelete));
+        });
+    }
+    private static LunchDataModel CreateDataModel(string? id, string? lunchName, double price, IngredientType ingredientType, bool isDeleted) => new(id, lunchName, ingredientType, price, isDeleted);
+}
+
+
--- a/ThreeFatMenProject/ThreeFatMenTests/DataModelsTest/LunchHistoryDataModelTests.cs
+++ b/ThreeFatMenProject/ThreeFatMenTests/DataModelsTest/LunchHistoryDataModelTests.cs
@@ -0,0 +1,56 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Intrinsics.X86;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Exceptions;
+
+namespace ThreeFatMenTests.DataModelsTest;
+[TestFixture]
+internal class LunchHistoryDataModelTests
+{
+    [Test]
+    public void LunchIdIsNullOrEmptyTest()
+    {
+        var lunch = CreateDataModel(null, 10);
+        Assert.That(() => lunch.Validate(), Throws.TypeOf<ValidationException>());
+        lunch = CreateDataModel(string.Empty, 10);
+        Assert.That(() => lunch.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void LunchIdIsNotGuidTest()
+    {
+        var lunch = CreateDataModel("id", 10);
+        Assert.That(() => lunch.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void OldPriceIsLessOrZeroTest()
+    {
+        var lunch = CreateDataModel(Guid.NewGuid().ToString(), 0);
+        Assert.That(() => lunch.Validate(), Throws.TypeOf<ValidationException>());
+        lunch = CreateDataModel(Guid.NewGuid().ToString(), -10);
+        Assert.That(() => lunch.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var lunchId = Guid.NewGuid().ToString();
+        var oldPrice = 10;
+        var lunchHistory = CreateDataModel(lunchId, oldPrice);
+        Assert.That(() => lunchHistory.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(lunchHistory.LunchId, Is.EqualTo(lunchId));
+            Assert.That(lunchHistory.OldPrice, Is.EqualTo(oldPrice));
+            Assert.That(lunchHistory.ChangeDate, Is.LessThan(DateTime.UtcNow));
+            Assert.That(lunchHistory.ChangeDate, Is.GreaterThan(DateTime.UtcNow.AddMinutes(-1)));
+        });
+    }
+
+    private static LunchHistoryDataModel CreateDataModel(string? lunchId, double oldPrice) =>new(lunchId, oldPrice);
+}
--- a/ThreeFatMenProject/ThreeFatMenTests/DataModelsTest/PostDataModelTests.cs
+++ b/ThreeFatMenProject/ThreeFatMenTests/DataModelsTest/PostDataModelTests.cs
@@ -0,0 +1,66 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Enums;
+using ThreeFatMenContracts.Exceptions;
+
+namespace ThreeFatMenTests.DataModelsTest;
+[TestFixture]
+internal class PostDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var post = CreateDataModel(null,  "name", PostType.Cook, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(string.Empty, "name", PostType.Cook, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var post = CreateDataModel("id", "name", PostType.Cook, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostNameIsEmptyTest()
+    {
+        var manufacturer = CreateDataModel(Guid.NewGuid().ToString(), null, PostType.Cook, true, DateTime.UtcNow);
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+        manufacturer = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, PostType.Cook, true, DateTime.UtcNow);
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostTypeIsNoneTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), "name", PostType.None, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var postId = Guid.NewGuid().ToString();
+        var postName = "name";
+        var postType = PostType.Cook;
+        var isActual = false;
+        var changeDate = DateTime.UtcNow.AddDays(-1);
+        var post = CreateDataModel(postId, postName, postType, 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.IsActual, Is.EqualTo(isActual));
+            Assert.That(post.ChangeDate, Is.EqualTo(changeDate));
+        });
+    }
+    private static PostDataModel CreateDataModel(string? id,  string? postName, PostType postType, bool isActual, DateTime changeDate) =>new(id, postName, postType, isActual, changeDate);
+}
--- a/ThreeFatMenProject/ThreeFatMenTests/DataModelsTest/SaleDataModelTests.cs
+++ b/ThreeFatMenProject/ThreeFatMenTests/DataModelsTest/SaleDataModelTests.cs
@@ -0,0 +1,101 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Enums;
+using ThreeFatMenContracts.Exceptions;
+
+namespace ThreeFatMenTests.DataModelsTest;
+[TestFixture]
+internal class SaleDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(null, Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var sale = CreateDataModel("id", Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void EmployeeIdIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), null, Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void EmployeeIdIsNotGuidTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), "employeeId", Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void BuyerIdIsNotGuidTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "buyerId", 10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void SumIsLessOrZeroTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 0, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), -10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void LunchIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false, null);
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false, []);
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var saleId = Guid.NewGuid().ToString();
+        var workerId = Guid.NewGuid().ToString();
+        var buyerId = Guid.NewGuid().ToString();
+        var sum = 10;
+        var discountType = DiscountType.Certificate;
+        var discount = 1;
+        var isCancel = true;
+        var lunches = CreateSubDataModel();
+        var sale = CreateDataModel(saleId, workerId, buyerId, sum, discountType, discount, isCancel, lunches);
+        Assert.That(() => sale.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(sale.Id, Is.EqualTo(saleId));
+            Assert.That(sale.WorkerId, Is.EqualTo(workerId));
+            Assert.That(sale.BuyerId, Is.EqualTo(buyerId));
+            Assert.That(sale.Sum, Is.EqualTo(sum));
+            Assert.That(sale.DiscountType, Is.EqualTo(discountType));
+            Assert.That(sale.Discount, Is.EqualTo(discount));
+            Assert.That(sale.IsCancel, Is.EqualTo(isCancel));
+            Assert.That(sale.Lunches, Is.EquivalentTo(lunches));
+        });
+    }
+
+    private static SaleDataModel CreateDataModel(string? id, string? workerId, string? buyerId, double sum, DiscountType discountType, double discount, bool isCancel, List<SaleLunchDataModel>? lunches) =>
+        new(id, workerId, buyerId, sum, discountType, discount, isCancel, lunches);
+
+    private static List<SaleLunchDataModel> CreateSubDataModel()
+        => [new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 1)];
+}
--- a/ThreeFatMenProject/ThreeFatMenTests/DataModelsTest/SaleLunchDataModelTests.cs
+++ b/ThreeFatMenProject/ThreeFatMenTests/DataModelsTest/SaleLunchDataModelTests.cs
@@ -0,0 +1,72 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Exceptions;
+
+namespace ThreeFatMenTests.DataModelsTest;
+[TestFixture]
+internal class SaleLunchDataModelTests
+{
+    [Test]
+    public void SaleIdIsNullOrEmptyTest()
+    {
+        var saleLunch = CreateDataModel(null, Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleLunch.Validate(), Throws.TypeOf<ValidationException>());
+        saleLunch = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleLunch.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void SaleIdIsNotGuidTest()
+    {
+        var saleLunch = CreateDataModel("saleId", Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleLunch.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void LunchIdIsNullOrEmptyTest()
+    {
+        var saleLunch = CreateDataModel(Guid.NewGuid().ToString(), null, 10);
+        Assert.That(() => saleLunch.Validate(), Throws.TypeOf<ValidationException>());
+        saleLunch = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleLunch.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void LunchIdIsNotGuidTest()
+    {
+        var saleLunch = CreateDataModel(Guid.NewGuid().ToString(), "lunchId", 10);
+        Assert.That(() => saleLunch.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void CountIsLessOrZeroTest()
+    {
+        var saleLunch = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 0);
+        Assert.That(() => saleLunch.Validate(), Throws.TypeOf<ValidationException>());
+        saleLunch = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), -10);
+        Assert.That(() => saleLunch.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var saleId = Guid.NewGuid().ToString();
+        var lunchId = Guid.NewGuid().ToString();
+        var count = 10;
+        var saleLunch = CreateDataModel(saleId, lunchId, count);
+        Assert.That(() => saleLunch.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(saleLunch.SaleId, Is.EqualTo(saleId));
+            Assert.That(saleLunch.LunchId, Is.EqualTo(lunchId));
+            Assert.That(saleLunch.Count, Is.EqualTo(count));
+        });
+    }
+
+    private static SaleLunchDataModel CreateDataModel(string? saleId, string? lunchId, int count) =>
+        new(saleId, lunchId, count);
+}
--- a/ThreeFatMenProject/ThreeFatMenTests/DataModelsTest/WorkerDataModelTests.cs
+++ b/ThreeFatMenProject/ThreeFatMenTests/DataModelsTest/WorkerDataModelTests.cs
@@ -0,0 +1,115 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using ThreeFatMenContracts.DataModels;
+using ThreeFatMenContracts.Exceptions;
+
+namespace ThreeFatMenTests.DataModelsTest;
+
+[TestFixture]
+internal class WorkerDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var worker = CreateDataModel(null, "Фамилия Имя Отчество", Guid.NewGuid().ToString(),
+        DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(),
+        Throws.TypeOf<ValidationException>());
+        worker = CreateDataModel(string.Empty, "Фамилия Имя Отчество",
+        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", "Фамилия Имя Отчество", 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(), "Фамилия Имя Отчество", null,
+        DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(),
+        Throws.TypeOf<ValidationException>());
+        worker = CreateDataModel(Guid.NewGuid().ToString(), "Фамилия Имя Отчество",
+        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(), "Фамилия Имя Отчество",
+"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(), "Фамилия Имя Отчество",
+        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(), "Фамилия Имя Отчество",
+        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(), "Фамилия Имя Отчество",
+        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 = "Фамилия Имя Отчество";
+        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);
+}
+
--- a/ThreeFatMenProject/ThreeFatMenTests/ThreeFatMenTests.csproj
+++ b/ThreeFatMenProject/ThreeFatMenTests/ThreeFatMenTests.csproj
@@ -0,0 +1,29 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="Moq" Version="4.20.72" />
+    <PackageReference Include="NUnit" Version="4.2.2" />
+    <PackageReference Include="NUnit.Analyzers" Version="4.4.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ThreeFatMenBusinessLogic\ThreeFatMenBusinessLogic.csproj" />
+    <ProjectReference Include="..\ThreeFatMenContracts\ThreeFatMenContracts.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="NUnit.Framework" />
+  </ItemGroup>
+
+</Project>
Author	SHA1	Message	Date
Anya	fd218c2ec1	лаба2	2025-04-16 00:15:22 +04:00
Anya	60d9e15bba	Сделанная 1 лаба	2025-02-27 12:23:58 +04:00