lab_3

DaisiesBusinessLogic/DaisiesBusinessLogic.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="9.0.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\DaisiesContracts\DaisiesContracts.csproj" />
+  </ItemGroup>
+
+</Project>

DaisiesBusinessLogic/Implementations/BouquetBusinessLogicContract.cs

@@ -0,0 +1,115 @@
+using DaisiesContracts.BusinessLogicsContracts;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.Extensions;
+using DaisiesContracts.StoragesContracts;
+using Microsoft.Extensions.Logging;
+using System.Text.Json;
+
+namespace DaisiesBusinessLogic.Implementations;
+
+public class BouquetBusinessLogicContract(IBouquetStorageContract bouquetStorageContract, ILogger logger) : IBouquetBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly IBouquetStorageContract _bouquetStorageContract = bouquetStorageContract;
+
+    public void CancelBouquet(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");
+        }
+        _bouquetStorageContract.DelElement(id);
+    }
+
+    public List<BouquetDataModel> GetAllBouquetsByCustomerByPeriod(string customerId, DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSales params: {customerId}, {fromDate}, {toDate}", customerId, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (customerId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(customerId));
+        }
+        if (!customerId.IsGuid())
+        {
+            throw new ValidationException("The value in the field customerId is not a unique identifier.");
+        }
+        return _bouquetStorageContract.GetList(fromDate, toDate, customerId: customerId) ?? throw new NullListException();
+    }
+
+    public List<BouquetDataModel> GetAllBouquetsByEmployeerByPeriod(string employeerId, DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSales params: {employeerId}, {fromDate}, {toDate}", employeerId, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (employeerId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(employeerId));
+        }
+        if (!employeerId.IsGuid())
+        {
+            throw new ValidationException("The value in the field employeerId is not a unique identifier.");
+        }
+        return _bouquetStorageContract.GetList(fromDate, toDate, employeeId: employeerId) ?? throw new NullListException();
+    }
+
+    public List<BouquetDataModel> GetAllBouquetsByFlowerByPeriod(string flowerId, DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSales params: {flowerId}, {fromDate}, {toDate}", flowerId, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (flowerId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(flowerId));
+        }
+        if (!flowerId.IsGuid())
+        {
+            throw new ValidationException("The value in the field flowerId is not a unique identifier.");
+        }
+        return _bouquetStorageContract.GetList(fromDate, toDate, flowerId: flowerId) ?? throw new NullListException();
+    }
+
+    public List<BouquetDataModel> GetAllBouquetsByPeriod(DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllSales params: {fromDate}, {toDate}", fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _bouquetStorageContract.GetList(fromDate, toDate) ?? throw new NullListException();
+    }
+
+    public BouquetDataModel GetBouquetByData(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 _bouquetStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+    }
+
+    public void InsertBouquet(BouquetDataModel bouquetDataModel)
+    {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(bouquetDataModel));
+        ArgumentNullException.ThrowIfNull(bouquetDataModel);
+        bouquetDataModel.Validate();
+        _bouquetStorageContract.AddElement(bouquetDataModel);
+    }
+}

DaisiesBusinessLogic/Implementations/CustomerBusinessLogicContract.cs

@@ -0,0 +1,70 @@
+using DaisiesContracts.BusinessLogicsContracts;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.Extensions;
+using DaisiesContracts.StoragesContracts;
+using Microsoft.Extensions.Logging;
+using System.Text.Json;
+using System.Text.RegularExpressions;
+
+namespace DaisiesBusinessLogic.Implementations;
+
+public class CustomerBusinessLogicContract(ICustomerStorageContract customerStorageContract, ILogger logger) : ICustomerBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly ICustomerStorageContract _customerStorageContract = customerStorageContract;
+
+    public void DeleteCustomer(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");
+        }
+        _customerStorageContract.DelElement(id);
+    }
+
+    public List<CustomerDataModel> GetAllCustomers()
+    {
+        _logger.LogInformation("GetAllCustomers");
+        return _customerStorageContract.GetList() ?? throw new NullListException();
+    }
+
+    public CustomerDataModel GetCustomerByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _customerStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+        }
+        if (Regex.IsMatch(data, @"^((8|\+7)[\- ]?)?(\(?\d{3}\)?[\- ]?)?[\d\- ]{7,10}$"))
+        {
+            return _customerStorageContract.GetElementByPhoneNumber(data) ?? throw new ElementNotFoundException(data);
+        }
+        return _customerStorageContract.GetElementByFullName(data) ?? throw new ElementNotFoundException(data);
+    }
+
+    public void InsertCustomer(CustomerDataModel customerDataModel)
+    {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(customerDataModel));
+        ArgumentNullException.ThrowIfNull(customerDataModel);
+        customerDataModel.Validate();
+        _customerStorageContract.AddElement(customerDataModel);
+    }
+
+    public void UpdateCustomer(CustomerDataModel customerDataModel)
+    {
+        _logger.LogInformation("Update data: {json}", JsonSerializer.Serialize(customerDataModel));
+        ArgumentNullException.ThrowIfNull(customerDataModel);
+        customerDataModel.Validate();
+        _customerStorageContract.UpdElement(customerDataModel);
+    }
+}

DaisiesBusinessLogic/Implementations/CustomerDiscountBusinessLogicContract.cs

@@ -0,0 +1,61 @@
+using DaisiesContracts.BusinessLogicsContracts;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.Extensions;
+using DaisiesContracts.StoragesContracts;
+using Microsoft.Extensions.Logging;
+
+namespace DaisiesBusinessLogic.Implementations;
+
+public class CustomerDiscountBusinessLogicContract(ICustomerDiscountStorageContract customerDiscountStorageContract, IBouquetStorageContract bouquetStorageContract, ICustomerStorageContract customerStorageContract, ILogger logger) : ICustomerDiscountBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly ICustomerDiscountStorageContract _customerDiscountStorageContract = customerDiscountStorageContract;
+    private readonly ICustomerStorageContract _customerStorageContract = customerStorageContract;
+    private readonly IBouquetStorageContract _bouquetStorageContract = bouquetStorageContract;
+
+    public void CalculateDiscountByMounth(DateTime date)
+    {
+        _logger.LogInformation("CalculateDiscountByMounth: {date}", date);
+        var startDate = new DateTime(date.Year, date.Month, 1);
+        var finishDate = new DateTime(date.Year, date.Month, DateTime.DaysInMonth(date.Year, date.Month));
+        var customers = _customerStorageContract.GetList() ?? throw new NullListException();
+        foreach (var customer in customers)
+        {
+            var sales = _bouquetStorageContract.GetList(startDate, finishDate, customerId: customer.Id)?.Sum(x => x.Items.Count) ??
+                throw new NullListException();
+            var salary = sales * 0.1 > 100 ? 100 : sales * 0.1;
+            _logger.LogDebug("The customer {customerId} was paid a salary of {salary}", customer.Id, salary);
+            _customerDiscountStorageContract.AddElement(new CustomerDiscountDataModel(customer.Id, DateTime.UtcNow, (decimal)salary));
+        }
+    }
+
+    public List<CustomerDiscountDataModel> GetAllDiscountsByPeriod(DateTime fromDate, DateTime toDate)
+    {
+        _logger.LogInformation("GetAllDiscounts params: {fromDate}, {toDate}", fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _customerDiscountStorageContract.GetList(fromDate, toDate) ?? throw new NullListException();
+    }
+
+    public List<CustomerDiscountDataModel> GetAllDiscountsByPeriodByCustomer(DateTime fromDate, DateTime toDate, string customerId)
+    {
+
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        if (customerId.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(customerId));
+        }
+        if (!customerId.IsGuid())
+        {
+            throw new ValidationException("The value in the field customerId is not a unique identifier.");
+        }
+        _logger.LogInformation("GetAllDiscounts params: {fromDate}, {toDate}, {workerId}", fromDate, toDate, customerId);
+        return _customerDiscountStorageContract.GetList(fromDate, toDate, customerId) ?? throw new NullListException();
+    }
+}

DaisiesBusinessLogic/Implementations/EmployeeBusinessLogicContract.cs

@@ -0,0 +1,75 @@
+using DaisiesContracts.BusinessLogicsContracts;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.Extensions;
+using DaisiesContracts.StoragesContracts;
+using Microsoft.Extensions.Logging;
+using System.Text.Json;
+
+namespace DaisiesBusinessLogic.Implementations;
+
+public class EmployeeBusinessLogicContract(IEmployeeStorageContract employeeStorageContract, ILogger logger) : IEmployeeBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly IEmployeeStorageContract _employeeStorageContract = employeeStorageContract;
+
+    public void DeleteEmployeer(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");
+        }
+        _employeeStorageContract.DelElement(id);
+    }
+
+    public List<EmployeeDataModel> GetAllEmployeers(bool onlyActive = true)
+    {
+        _logger.LogInformation("GetAllEmployeers params: {onlyActive}", onlyActive);
+        return _employeeStorageContract.GetList(onlyActive) ?? throw new NullListException();
+    }
+
+    public List<EmployeeDataModel> GetAllEmployeersByEmploymentDate(DateTime fromDate, DateTime toDate, bool onlyActive = true)
+    {
+        _logger.LogInformation("GetAllEmployeers params: {onlyActive}, {fromDate}, {toDate}", onlyActive, fromDate, toDate);
+        if (fromDate.IsDateNotOlder(toDate))
+        {
+            throw new IncorrectDatesException(fromDate, toDate);
+        }
+        return _employeeStorageContract.GetList(onlyActive, fromEmploymentDate: fromDate, toEmploymentDate: toDate) ?? throw new NullListException();
+    }
+
+    public EmployeeDataModel GetEmployeerByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _employeeStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+        }
+        return _employeeStorageContract.GetElementByFullName(data) ?? throw new ElementNotFoundException(data);
+    }
+
+    public void InsertEmployeer(EmployeeDataModel employeeDataModel)
+    {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(employeeDataModel));
+        ArgumentNullException.ThrowIfNull(employeeDataModel);
+        employeeDataModel.Validate();
+        _employeeStorageContract.AddElement(employeeDataModel);
+    }
+
+    public void UpdateEmployeer(EmployeeDataModel employeeDataModel)
+    {
+        _logger.LogInformation("Update data: {json}", JsonSerializer.Serialize(employeeDataModel));
+        ArgumentNullException.ThrowIfNull(employeeDataModel);
+        employeeDataModel.Validate();
+        _employeeStorageContract.UpdElement(employeeDataModel);
+    }
+}

DaisiesBusinessLogic/Implementations/FlowerBusinessLogicContract.cs

@@ -0,0 +1,65 @@
+using DaisiesContracts.BusinessLogicsContracts;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.Extensions;
+using DaisiesContracts.StoragesContracts;
+using Microsoft.Extensions.Logging;
+using System.Text.Json;
+
+namespace DaisiesBusinessLogic.Implementations;
+
+public class FlowerBusinessLogicContract(IFlowerStorageContract flowerStorageContract, ILogger logger) : IFlowerBusinessLogicContract
+{
+    private readonly ILogger _logger = logger;
+    private readonly IFlowerStorageContract _flowerStorageContract = flowerStorageContract;
+
+    public void DeleteFlower(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");
+        }
+        _flowerStorageContract.DelElement(id);
+    }
+
+    public List<FlowerDataModel> GetAllFlowers(bool onlyActive = true)
+    {
+        _logger.LogInformation("GetAllFlowers params: {onlyActive}", onlyActive);
+        return _flowerStorageContract.GetList() ?? throw new NullListException();
+    }
+
+    public FlowerDataModel GetFlowerByData(string data)
+    {
+        _logger.LogInformation("Get element by data: {data}", data);
+        if (data.IsEmpty())
+        {
+            throw new ArgumentNullException(nameof(data));
+        }
+        if (data.IsGuid())
+        {
+            return _flowerStorageContract.GetElementById(data) ?? throw new ElementNotFoundException(data);
+        }
+        return _flowerStorageContract.GetElementByName(data) ?? throw new ElementNotFoundException(data);
+    }
+
+    public void InsertFlower(FlowerDataModel flowerDataModel)
+    {
+        _logger.LogInformation("New data: {json}", JsonSerializer.Serialize(flowerDataModel));
+        ArgumentNullException.ThrowIfNull(flowerDataModel);
+        flowerDataModel.Validate();
+        _flowerStorageContract.AddElement(flowerDataModel);
+    }
+
+    public void UpdateFlower(FlowerDataModel flowerDataModel)
+    {
+        _logger.LogInformation("Update data: {json}", JsonSerializer.Serialize(flowerDataModel));
+        ArgumentNullException.ThrowIfNull(flowerDataModel);
+        flowerDataModel.Validate();
+        _flowerStorageContract.UpdElement(flowerDataModel);
+    }
+}

DaisiesContracts/BusinessLogicsContracts/IBouquetBusinessLogicContract.cs

@@ -0,0 +1,20 @@
+using DaisiesContracts.DataModels;
+
+namespace DaisiesContracts.BusinessLogicsContracts;
+
+public interface IBouquetBusinessLogicContract
+{
+    List<BouquetDataModel> GetAllBouquetsByPeriod(DateTime fromDate, DateTime toDate);
+
+    List<BouquetDataModel> GetAllBouquetsByEmployeerByPeriod(string employeerId, DateTime fromDate, DateTime toDate);
+
+    List<BouquetDataModel> GetAllBouquetsByCustomerByPeriod(string customerId, DateTime fromDate, DateTime toDate);
+
+    List<BouquetDataModel> GetAllBouquetsByFlowerByPeriod(string flowerId, DateTime fromDate, DateTime toDate);
+
+    BouquetDataModel GetBouquetByData(string data);
+
+    void InsertBouquet(BouquetDataModel bouquetDataModel);
+
+    void CancelBouquet(string id);
+}

DaisiesContracts/BusinessLogicsContracts/ICustomerBusinessLogicContract.cs

@@ -0,0 +1,16 @@
+using DaisiesContracts.DataModels;
+
+namespace DaisiesContracts.BusinessLogicsContracts;
+
+public interface ICustomerBusinessLogicContract
+{
+    List<CustomerDataModel> GetAllCustomers();
+
+    CustomerDataModel GetCustomerByData(string data);
+
+    void InsertCustomer(CustomerDataModel customerDataModel);
+
+    void UpdateCustomer(CustomerDataModel customerDataModel);
+
+    void DeleteCustomer(string id);
+}

DaisiesContracts/BusinessLogicsContracts/ICustomerDiscountBusinessLogicContract.cs

@@ -0,0 +1,12 @@
+using DaisiesContracts.DataModels;
+
+namespace DaisiesContracts.BusinessLogicsContracts;
+
+public interface ICustomerDiscountBusinessLogicContract
+{
+    List<CustomerDiscountDataModel> GetAllDiscountsByPeriod(DateTime fromDate, DateTime toDate);
+
+    List<CustomerDiscountDataModel> GetAllDiscountsByPeriodByCustomer(DateTime fromDate, DateTime toDate, string customerId);
+
+    void CalculateDiscountByMounth(DateTime date);
+}

DaisiesContracts/BusinessLogicsContracts/IEmployeeBusinessLogicContract.cs

@@ -0,0 +1,18 @@
+using DaisiesContracts.DataModels;
+
+namespace DaisiesContracts.BusinessLogicsContracts;
+
+public interface IEmployeeBusinessLogicContract
+{
+    List<EmployeeDataModel> GetAllEmployeers(bool onlyActive = true);
+
+    List<EmployeeDataModel> GetAllEmployeersByEmploymentDate(DateTime fromDate, DateTime toDate, bool onlyActive = true);
+
+    EmployeeDataModel GetEmployeerByData(string data);
+
+    void InsertEmployeer(EmployeeDataModel employeeDataModel);
+
+    void UpdateEmployeer(EmployeeDataModel employeeDataModel);
+
+    void DeleteEmployeer(string id);
+}

DaisiesContracts/BusinessLogicsContracts/IFlowerBusinessLogicContract.cs

@@ -0,0 +1,16 @@
+using DaisiesContracts.DataModels;
+
+namespace DaisiesContracts.BusinessLogicsContracts;
+
+public interface IFlowerBusinessLogicContract
+{
+    List<FlowerDataModel> GetAllFlowers(bool onlyActive = true);
+
+    FlowerDataModel GetFlowerByData(string data);
+
+    void InsertFlower(FlowerDataModel flowerDataModel);
+
+    void UpdateFlower(FlowerDataModel flowerDataModel);
+
+    void DeleteFlower(string id);
+}

DaisiesContracts/DataModels/BouquetItemDataModel.cs

@@ -4,13 +4,18 @@ using DaisiesContracts.Infrastructure;
 
 namespace DaisiesContracts.DataModels;
 
-public class BouquetItemDataModel(string flowerId, int quantity) : IValidation
+public class BouquetItemDataModel(string bouquetId, string flowerId, int quantity) : IValidation
 {
+    public string BouquetId { get; private set; } = bouquetId;
     public string FlowerId { get; private set; } = flowerId;
     public int Quantity { get; private set; } = quantity;
 
     public void Validate()
     {
+        if (BouquetId.IsEmpty())
+            throw new ValidationException("Bouquet Id пустой");
+        if (!BouquetId.IsGuid())
+            throw new ValidationException("Bouquet Id не является валидным GUID");
         if (FlowerId.IsEmpty())
             throw new ValidationException("Flower Id пустой");
         if (!FlowerId.IsGuid())

DaisiesContracts/DataModels/CustomerDataModel.cs

@@ -5,7 +5,7 @@ using System.Text.RegularExpressions;
 
 namespace DaisiesContracts.DataModels;
 
-public class CustomerDataModel(string id, string fullName, string phoneNumber, decimal discount, DateTime registrationDate) : IValidation
+public class CustomerDataModel(string id, string fullName, string phoneNumber, DateTime registrationDate) : IValidation
 {
     public string Id { get; private set; } = id;
     public string FullName { get; private set; } = fullName;

DaisiesContracts/DataModels/CustomerDiscountDataModel.cs

@@ -0,0 +1,26 @@
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.Extensions;
+using DaisiesContracts.Infrastructure;
+
+namespace DaisiesContracts.DataModels;
+
+public class CustomerDiscountDataModel(string customerId, DateTime discountDateTime, decimal discount) : IValidation
+{
+    public string Id { get; private set; } = Guid.NewGuid().ToString();
+    public string CustomerId { get; private set; } = customerId;
+    public DateTime DiscountDateTime { get; private set; } = discountDateTime;
+    /// <summary>
+    /// Скидка в процентах (от 0 до 100) 
+    /// </summary>
+    public decimal Discount { get; private set; } = discount;
+
+    public void Validate()
+    {
+        if (CustomerId.IsEmpty())
+            throw new ValidationException("Customer Id пустой");
+        if (!CustomerId.IsGuid())
+            throw new ValidationException("Customer Id не является валидным GUID");
+        if (Discount < 0 || Discount > 100)
+            throw new ValidationException("Скидка должна быть в диапазоне от 0 до 100");
+    }
+}

DaisiesContracts/Exceptions/ElementDeletedException.cs

@@ -0,0 +1,6 @@
+namespace DaisiesContracts.Exceptions;
+
+public class ElementDeletedException : Exception
+{
+    public ElementDeletedException(string id) : base($"Cannot modify a deleted item(id: {id})") { }
+}

DaisiesContracts/Exceptions/ElementExistsException.cs

@@ -0,0 +1,14 @@
+namespace DaisiesContracts.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;
+	}
+}

DaisiesContracts/Exceptions/ElementNotFoundException.cs

@@ -0,0 +1,11 @@
+namespace DaisiesContracts.Exceptions;
+
+public class ElementNotFoundException : Exception
+{
+	public string Value { get; private set; }
+
+	public ElementNotFoundException(string value) : base($"Element not found at value = {value}")
+	{
+		Value = value;
+	}
+}

DaisiesContracts/Exceptions/IncorrectDatesException.cs

@@ -0,0 +1,6 @@
+namespace DaisiesContracts.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}") { }
+}

DaisiesContracts/Exceptions/NullListException.cs

@@ -0,0 +1,6 @@
+namespace DaisiesContracts.Exceptions;
+
+public class NullListException : Exception
+{
+	public NullListException() : base("The returned list is null") { }
+}

DaisiesContracts/Exceptions/StorageException.cs

@@ -0,0 +1,6 @@
+namespace DaisiesContracts.Exceptions;
+
+public class StorageException : Exception
+{
+	public StorageException(Exception ex) : base($"Error while working in storage: {ex.Message}", ex) { }
+}

DaisiesContracts/Extensions/DateTimeExtensions.cs

@@ -0,0 +1,9 @@
+namespace DaisiesContracts.Extensions;
+
+public static class DateTimeExtensions
+{
+	public static bool IsDateNotOlder(this DateTime date, DateTime olderDate)
+	{
+		return date >= olderDate;
+	}
+}

DaisiesContracts/Infrastrcuture/IConfigurationDatabase.cs

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

DaisiesContracts/StoragesContracts/IBouquetStorageContract.cs

@@ -0,0 +1,16 @@
+using DaisiesContracts.DataModels;
+
+namespace DaisiesContracts.StoragesContracts;
+
+public interface IBouquetStorageContract
+{
+    List<BouquetDataModel> GetList(DateTime? startDate = null, DateTime? endDate = null, string? employeeId = null, string? customerId = null, string? flowerId = null);
+
+    List<BouquetHistoryDataModel> GetHistoryByBouquetId(string bouquetId);
+
+    BouquetDataModel? GetElementById(string id);
+
+    void AddElement(BouquetDataModel bouquetDataModel);
+
+    void DelElement(string id);
+}

DaisiesContracts/StoragesContracts/ICustomerDiscountStorageContract.cs

@@ -0,0 +1,10 @@
+using DaisiesContracts.DataModels;
+
+namespace DaisiesContracts.StoragesContracts;
+
+public interface ICustomerDiscountStorageContract
+{
+    List<CustomerDiscountDataModel> GetList(DateTime startDate, DateTime endDate, string? customerId = null);
+
+    void AddElement(CustomerDiscountDataModel customerDiscountDataModel);
+}

DaisiesContracts/StoragesContracts/ICustomerStorageContract.cs

@@ -0,0 +1,20 @@
+using DaisiesContracts.DataModels;
+
+namespace DaisiesContracts.StoragesContracts;
+
+public interface ICustomerStorageContract
+{
+    List<CustomerDataModel> GetList();
+
+    CustomerDataModel? GetElementById(string id);
+
+    CustomerDataModel? GetElementByPhoneNumber(string phoneNumber);
+
+    CustomerDataModel? GetElementByFullName(string fullName);
+
+    void AddElement(CustomerDataModel customerDataModel);
+
+    void UpdElement(CustomerDataModel customerDataModel);
+
+    void DelElement(string id);
+}

DaisiesContracts/StoragesContracts/IEmployeeStorageContract.cs

@@ -0,0 +1,18 @@
+using DaisiesContracts.DataModels;
+
+namespace DaisiesContracts.StoragesContracts;
+
+public interface IEmployeeStorageContract
+{
+    List<EmployeeDataModel> GetList(bool onlyActive = true, DateTime? fromEmploymentDate = null, DateTime? toEmploymentDate = null);
+
+    EmployeeDataModel? GetElementById(string id);
+
+    EmployeeDataModel? GetElementByFullName(string fullName);
+
+    void AddElement(EmployeeDataModel employeeDataModel);
+
+    void UpdElement(EmployeeDataModel employeeDataModel);
+
+    void DelElement(string id);
+}

DaisiesContracts/StoragesContracts/IFlowerStorageContract.cs

@@ -0,0 +1,18 @@
+using DaisiesContracts.DataModels;
+
+namespace DaisiesContracts.StoragesContracts;
+
+public interface IFlowerStorageContract
+{
+    List<FlowerDataModel> GetList();
+
+    FlowerDataModel? GetElementById(string id);
+
+    FlowerDataModel? GetElementByName(string name);
+
+    void AddElement(FlowerDataModel flowerDataModel);
+
+    void UpdElement(FlowerDataModel flowerDataModel);
+
+    void DelElement(string id);
+}

DaisiesDatabase/DaisiesDatabase.csproj

@@ -0,0 +1,19 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="AutoMapper" Version="14.0.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.3" />
+    <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="9.0.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\DaisiesContracts\DaisiesContracts.csproj" />
+  </ItemGroup>
+
+</Project>

DaisiesDatabase/DaisiesDbContext.cs

@@ -0,0 +1,37 @@
+using DaisiesDatabase.Models;
+using Microsoft.EntityFrameworkCore;
+using DaisiesContracts.Infrastrcuture;
+
+namespace DaisiesDatabase;
+
+public class DaisiesDbContext(IConfigurationDatabase configurationDatabase) : DbContext
+{
+    private readonly IConfigurationDatabase? _configurationDatabase = configurationDatabase;
+
+    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+    {
+        optionsBuilder.UseNpgsql(_configurationDatabase?.ConnectionString, o => o.SetPostgresVersion(12, 2));
+        base.OnConfiguring(optionsBuilder);
+    }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        base.OnModelCreating(modelBuilder);
+        modelBuilder.Entity<Customer>().HasIndex(x => x.PhoneNumber).IsUnique();
+
+        modelBuilder.Entity<Flower>().HasIndex(x => x.Name).IsUnique();
+
+        modelBuilder.Entity<BouquetItem>().HasKey(x => new
+        {
+            x.BouquetId,
+            x.FlowerId
+        });
+    }
+    public DbSet<Employee> Employeers { get; set; }
+    public DbSet<Flower> Flowers { get; set; }
+    public DbSet<BouquetHistory> BouquetHistories { get; set; }
+    public DbSet<Customer> Customers { get; set; }
+    public DbSet<CustomerDiscount> CustomerDiscounts { get; set; }
+    public DbSet<Bouquet> Bouquets { get; set; }
+    public DbSet<BouquetItem> BouquetItems { get; set; }
+}

DaisiesDatabase/Implementations/BouquetStorageContract.cs

@@ -0,0 +1,120 @@
+using AutoMapper;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.StoragesContracts;
+using DaisiesDatabase.Models;
+using Microsoft.EntityFrameworkCore;
+
+namespace DaisiesDatabase.Implementations;
+
+public class BouquetStorageContract : IBouquetStorageContract
+{
+    private readonly DaisiesDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public BouquetStorageContract(DaisiesDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<BouquetItem, BouquetItemDataModel>();
+            cfg.CreateMap<BouquetItemDataModel, BouquetItem>();
+            cfg.CreateMap<Bouquet, BouquetDataModel>();
+            cfg.CreateMap<BouquetDataModel, Bouquet>().ForMember(x => x.Items, x => x.MapFrom(src => src.Items));
+            cfg.CreateMap<BouquetHistory, BouquetHistoryDataModel>();
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public void AddElement(BouquetDataModel bouquetDataModel)
+    {
+        try
+        {
+            _dbContext.Bouquets.Add(_mapper.Map<Bouquet>(bouquetDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetOrderById(id) ?? throw new ElementNotFoundException(id);
+            _dbContext.Bouquets.Remove(element);
+            _dbContext.SaveChanges();
+        }
+        catch (Exception ex) when (ex is ElementDeletedException || ex is ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public BouquetDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<BouquetDataModel>(GetOrderById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public List<BouquetHistoryDataModel> GetHistoryByBouquetId(string bouquetId)
+    {
+        try
+        {
+            return [.. _dbContext.BouquetHistories.Where(x => x.BouquetId == bouquetId).OrderByDescending(x => x.ChangeDate).Select(x => _mapper.Map<BouquetHistoryDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public List<BouquetDataModel> GetList(DateTime? startDate = null, DateTime? endDate = null, string? employeeId = null, string? customerId = null, string? flowerId = null)
+    {
+        try
+        {
+            var query = _dbContext.Bouquets.Include(x => x.Items).AsQueryable();
+            if (startDate is not null && endDate is not null)
+            {
+                query = query.Where(x => x.CompositionDate >= startDate && x.CompositionDate < endDate);
+            }
+            if (employeeId is not null)
+            {
+                query = query.Where(x => x.EmployeeId == employeeId);
+            }
+            if (customerId is not null)
+            {
+                query = query.Where(x => x.CustomerId == customerId);
+            }
+            if (flowerId is not null)
+            {
+                query = query.Where(x => x.Items!.Any(y => y.FlowerId == flowerId));
+            }
+            return [.. query.Select(x => _mapper.Map<BouquetDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    private Bouquet? GetOrderById(string id) => _dbContext.Bouquets.FirstOrDefault(x => x.Id == id);
+}

DaisiesDatabase/Implementations/CustomerDiscountStorageContract.cs

@@ -0,0 +1,58 @@
+using AutoMapper;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.StoragesContracts;
+using DaisiesDatabase.Models;
+using CustomerDiscount = DaisiesDatabase.Models.CustomerDiscount;
+
+namespace DaisiesDatabase.Implementations;
+
+public class CustomerDiscountStorageContract : ICustomerDiscountStorageContract
+{
+    private readonly DaisiesDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public CustomerDiscountStorageContract(DaisiesDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<CustomerDiscount, CustomerDiscountDataModel>();
+            cfg.CreateMap<CustomerDiscountDataModel, CustomerDiscount>()
+            .ForMember(dest => dest.Discount, opt => opt.MapFrom(src => src.Discount));
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public void AddElement(CustomerDiscountDataModel customerDiscountDataModel)
+    {
+        try
+        {
+            _dbContext.CustomerDiscounts.Add(_mapper.Map<CustomerDiscount>(customerDiscountDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public List<CustomerDiscountDataModel> GetList(DateTime startDate, DateTime endDate, string? customerId = null)
+    {
+        try
+        {
+            var query = _dbContext.CustomerDiscounts.Where(x => x.DiscountDateTime >= startDate && x.DiscountDateTime <= endDate);
+            if (customerId is not null)
+            {
+                query = query.Where(x => x.CustomerId == customerId);
+            }
+            return [.. query.Select(x => _mapper.Map<CustomerDiscountDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+}

DaisiesDatabase/Implementations/CustomerStorageContract.cs

@@ -0,0 +1,145 @@
+using AutoMapper;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.StoragesContracts;
+using DaisiesDatabase.Models;
+using Microsoft.EntityFrameworkCore;
+using Npgsql;
+
+namespace DaisiesDatabase.Implementations;
+
+public class CustomerStorageContract : ICustomerStorageContract
+{
+    private readonly DaisiesDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public CustomerStorageContract(DaisiesDbContext dbContext)
+    {
+        _dbContext = dbContext;
+
+        var configuration = new MapperConfiguration(cfg => cfg.AddMaps(typeof(Customer)));
+
+        _mapper = new Mapper(configuration);
+    }
+
+    public void AddElement(CustomerDataModel customerDataModel)
+    {
+        try
+        {
+            _dbContext.Customers.Add(_mapper.Map<Customer>(customerDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (InvalidOperationException ex) when (ex.TargetSite?.Name == "ThrowIdentityConflict")
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Id", customerDataModel.Id);
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Customers_PhoneNumber" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("PhoneNumber", customerDataModel.PhoneNumber);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetCustomerById(id) ?? throw new ElementNotFoundException(id);
+            _dbContext.Customers.Remove(element);
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public CustomerDataModel? GetElementByFullName(string fullName)
+    {
+        try
+        {
+            return
+            _mapper.Map<CustomerDataModel>(_dbContext.Customers.FirstOrDefault(x => x.FullName == fullName));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public CustomerDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<CustomerDataModel>(GetCustomerById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public CustomerDataModel? GetElementByPhoneNumber(string phoneNumber)
+    {
+        try
+        {
+            return
+            _mapper.Map<CustomerDataModel>(_dbContext.Customers.FirstOrDefault(x => x.PhoneNumber == phoneNumber));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public List<CustomerDataModel> GetList()
+    {
+        try
+        {
+            var query = _dbContext.Customers.AsQueryable();
+            return [.. query.Select(x => _mapper.Map<CustomerDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void UpdElement(CustomerDataModel customerDataModel)
+    {
+        try
+        {
+            var element = GetCustomerById(customerDataModel.Id) ?? throw new ElementNotFoundException(customerDataModel.Id);
+            _dbContext.Customers.Update(_mapper.Map(customerDataModel, element));
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    private Customer? GetCustomerById(string id) => _dbContext.Customers.FirstOrDefault(x => x.Id == id);
+}

DaisiesDatabase/Implementations/EmployeeStorageContract.cs

@@ -0,0 +1,131 @@
+using AutoMapper;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.StoragesContracts;
+using DaisiesDatabase.Models;
+
+namespace DaisiesDatabase.Implementations;
+
+public class EmployeeStorageContract : IEmployeeStorageContract
+{
+    private readonly DaisiesDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public EmployeeStorageContract(DaisiesDbContext dbContext)
+    {
+        _dbContext = dbContext;
+
+        var configuration = new MapperConfiguration(cfg => cfg.AddMaps(typeof(Employee)));
+
+        _mapper = new Mapper(configuration);
+    }
+
+    public void AddElement(EmployeeDataModel employeeDataModel)
+    {
+        try
+        {
+            _dbContext.Employeers.Add(_mapper.Map<Employee>(employeeDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (InvalidOperationException ex) when (ex.TargetSite?.Name == "ThrowIdentityConflict")
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Id", employeeDataModel.Id);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetWorkerById(id) ?? throw new ElementNotFoundException(id);
+            element.IsActive = false;
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public EmployeeDataModel? GetElementByFullName(string fullName)
+    {
+        try
+        {
+            return _mapper.Map<EmployeeDataModel>(_dbContext.Employeers.FirstOrDefault(x => x.FullName == fullName));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public EmployeeDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<EmployeeDataModel>(GetWorkerById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public List<EmployeeDataModel> GetList(bool onlyActive = true, DateTime? fromEmploymentDate = null, DateTime? toEmploymentDate = null)
+    {
+        try
+        {
+            var query = _dbContext.Employeers.AsQueryable();
+            if (onlyActive)
+            {
+                query = query.Where(x => x.IsActive);
+            }
+            if (fromEmploymentDate is not null && toEmploymentDate is not null)
+            {
+                query = query.Where(x => x.EmploymentDate >= fromEmploymentDate && x.EmploymentDate <= toEmploymentDate);
+            }
+            return [.. query.Select(x => _mapper.Map<EmployeeDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void UpdElement(EmployeeDataModel employeeDataModel)
+    {
+        try
+        {
+            var element = GetWorkerById(employeeDataModel.Id) ?? throw new ElementNotFoundException(employeeDataModel.Id);
+            _dbContext.Employeers.Update(_mapper.Map(employeeDataModel, element));
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    private Employee? GetWorkerById(string id) => _dbContext.Employeers.FirstOrDefault(x => x.Id == id && x.IsActive);
+}

DaisiesDatabase/Implementations/FlowerStorageContract.cs

@@ -0,0 +1,147 @@
+using AutoMapper;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.StoragesContracts;
+using DaisiesDatabase.Models;
+using Microsoft.EntityFrameworkCore;
+using Npgsql;
+
+namespace DaisiesDatabase.Implementations;
+
+public class FlowerStorageContract : IFlowerStorageContract
+{
+    private readonly DaisiesDbContext _dbContext;
+    private readonly Mapper _mapper;
+
+    public FlowerStorageContract(DaisiesDbContext dbContext)
+    {
+        _dbContext = dbContext;
+        var config = new MapperConfiguration(cfg =>
+        {
+            cfg.CreateMap<Flower, FlowerDataModel>();
+            cfg.CreateMap<FlowerDataModel, Flower>();
+        });
+        _mapper = new Mapper(config);
+    }
+
+    public void AddElement(FlowerDataModel flowerDataModel)
+    {
+        try
+        {
+            _dbContext.Flowers.Add(_mapper.Map<Flower>(flowerDataModel));
+            _dbContext.SaveChanges();
+        }
+        catch (InvalidOperationException ex) when (ex.TargetSite?.Name == "ThrowIdentityConflict")
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Id", flowerDataModel.Id);
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Flowers_Name" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Name", flowerDataModel.Name);
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void DelElement(string id)
+    {
+        try
+        {
+            var element = GetFlowerById(id) ?? throw new ElementNotFoundException(id);
+            _dbContext.Flowers.Remove(element);
+            _dbContext.SaveChanges();
+        }
+        catch (ElementNotFoundException ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public FlowerDataModel? GetElementById(string id)
+    {
+        try
+        {
+            return _mapper.Map<FlowerDataModel>(GetFlowerById(id));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public FlowerDataModel? GetElementByName(string name)
+    {
+        try
+        {
+            return _mapper.Map<FlowerDataModel>(_dbContext.Flowers.FirstOrDefault(x => x.Name == name));
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public List<FlowerDataModel> GetList()
+    {
+        try
+        {
+            var query = _dbContext.Flowers.AsQueryable();
+            return [.. query.Select(x => _mapper.Map<FlowerDataModel>(x))];
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    public void UpdElement(FlowerDataModel flowerDataModel)
+    {
+        try
+        {
+            var transaction = _dbContext.Database.BeginTransaction();
+            try
+            {
+                var element = GetFlowerById(flowerDataModel.Id) ?? throw new ElementNotFoundException(flowerDataModel.Id);
+                _dbContext.Flowers.Update(_mapper.Map(flowerDataModel, element));
+                _dbContext.SaveChanges();
+                transaction.Commit();
+            }
+            catch
+            {
+                transaction.Rollback();
+                throw;
+            }
+        }
+        catch (DbUpdateException ex) when (ex.InnerException is PostgresException { ConstraintName: "IX_Flowers_Name" })
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new ElementExistsException("Name", flowerDataModel.Name);
+        }
+        catch (Exception ex) when (ex is ElementDeletedException || ex is ElementNotFoundException)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw;
+        }
+        catch (Exception ex)
+        {
+            _dbContext.ChangeTracker.Clear();
+            throw new StorageException(ex);
+        }
+    }
+
+    private Flower? GetFlowerById(string id) => _dbContext.Flowers.FirstOrDefault(x => x.Id == id);
+}

DaisiesDatabase/Models/Bouquet.cs

@@ -0,0 +1,23 @@
+using DaisiesContracts.Enums;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Xml.Linq;
+
+namespace DaisiesDatabase.Models;
+
+public class Bouquet
+{
+    public required string Id { get; set; }
+    public required string EmployeeId { get; set; }
+    public required string CustomerId { get; set; }
+    public required string Name { get; set; }
+    public DateTime CompositionDate { get; set; }
+    public BouquetType Type { get; set; }
+    public Employee? Employee { get; set; }
+    public Customer? Customer { get; set; }
+
+    [ForeignKey("BouquetId")]
+    public List<BouquetItem>? Items { get; set; }
+
+    [ForeignKey("BouquetId")]
+    public List<BouquetHistory>? BouquetHistories { get; set; }
+}

DaisiesDatabase/Models/BouquetHistory.cs

@@ -0,0 +1,10 @@
+namespace DaisiesDatabase.Models;
+
+public class BouquetHistory
+{
+    public required string Id { get; set; }
+    public required string BouquetId { get; set; }
+    public required string OldName { get; set; }
+    public DateTime ChangeDate { get; set; }
+    public Bouquet? Bouquet { get; set; }
+}

DaisiesDatabase/Models/BouquetItem.cs

@@ -0,0 +1,11 @@
+namespace DaisiesDatabase.Models;
+
+public class BouquetItem
+{
+    public required string Id { get; set; }
+    public required string BouquetId { get; set; }
+    public required string FlowerId { get; set; }
+    public int Quantity { get; set; }
+    public Bouquet? Bouquet { get; set; }
+    public Flower? Flower { get; set; }
+}

DaisiesDatabase/Models/Customer.cs

@@ -0,0 +1,19 @@
+using AutoMapper;
+using DaisiesContracts.DataModels;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace DaisiesDatabase.Models;
+
+[AutoMap(typeof(CustomerDataModel), ReverseMap = true)]
+public class Customer
+{
+    public required string Id { get; set; }
+    public required string FullName { get; set; }
+    public required string PhoneNumber { get; set; }
+    public DateTime RegistrationDate { get; set; }
+
+    [ForeignKey("CustomerId")]
+    public List<Bouquet>? Bouquets { get; set; }
+    [ForeignKey("CustomerId")]
+    public List<CustomerDiscount>? CustomerDiscounts { get; set; }
+}

DaisiesDatabase/Models/CustomerDiscount.cs

@@ -0,0 +1,10 @@
+namespace DaisiesDatabase.Models;
+
+public class CustomerDiscount
+{
+    public required string Id { get; set; }
+    public required string CustomerId { get; set; }
+    public DateTime DiscountDateTime { get; set; }
+    public decimal Discount { get; set; }
+    public Customer? Customer { get; set; }
+}

DaisiesDatabase/Models/Employee.cs

@@ -0,0 +1,19 @@
+using AutoMapper;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Enums;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace DaisiesDatabase.Models;
+
+[AutoMap(typeof(EmployeeDataModel), ReverseMap = true)]
+public class Employee
+{
+    public required string Id { get; set; }
+    public required string FullName { get; set; }
+    public EmployeeRole Role { get; set; }
+    public DateTime EmploymentDate { get; set; }
+    public bool IsActive { get; set; }
+
+    [ForeignKey("EmployeeId")]
+    public List<Bouquet>? Bouquets { get; set; }
+}

DaisiesDatabase/Models/Flower.cs

@@ -0,0 +1,13 @@
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace DaisiesDatabase.Models;
+
+public class Flower
+{
+    public required string Id { get; set; }
+    public required string Name { get; set; }
+    public decimal Price { get; set; }
+
+    [ForeignKey("FlowerId")]
+    public List<BouquetItem>? Items { get; set; }
+}

DaisiesProject.sln

@@ -5,7 +5,11 @@ VisualStudioVersion = 17.8.34330.188
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DaisiesContracts", "DaisiesContracts\DaisiesContracts.csproj", "{C15353B7-699C-458E-B22F-AF50B4F7D36B}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DaisiesTests", "DaisiesTests\DaisiesTests.csproj", "{6DFD5D72-7970-4ED5-864F-2D53F404F4F7}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DaisiesTests", "DaisiesTests\DaisiesTests.csproj", "{6DFD5D72-7970-4ED5-864F-2D53F404F4F7}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "DaisiesBusinessLogic", "DaisiesBusinessLogic\DaisiesBusinessLogic.csproj", "{006545EC-4A37-43DF-AE7F-4120BC98B2E2}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DaisiesDatabase", "DaisiesDatabase\DaisiesDatabase.csproj", "{DF72C23E-F834-464D-B25F-6D841F77C2BB}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -21,6 +25,14 @@ Global
 		{6DFD5D72-7970-4ED5-864F-2D53F404F4F7}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{6DFD5D72-7970-4ED5-864F-2D53F404F4F7}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{6DFD5D72-7970-4ED5-864F-2D53F404F4F7}.Release|Any CPU.Build.0 = Release|Any CPU
+		{006545EC-4A37-43DF-AE7F-4120BC98B2E2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{006545EC-4A37-43DF-AE7F-4120BC98B2E2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{006545EC-4A37-43DF-AE7F-4120BC98B2E2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{006545EC-4A37-43DF-AE7F-4120BC98B2E2}.Release|Any CPU.Build.0 = Release|Any CPU
+		{DF72C23E-F834-464D-B25F-6D841F77C2BB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{DF72C23E-F834-464D-B25F-6D841F77C2BB}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{DF72C23E-F834-464D-B25F-6D841F77C2BB}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{DF72C23E-F834-464D-B25F-6D841F77C2BB}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

DaisiesTests/BusinessLogicsContractsTests/BouquetBusinessLogicContractTests.cs

@@ -0,0 +1,501 @@
+using DaisiesContracts.BusinessLogicsContracts;
+using DaisiesContracts.Exceptions;
+using DaisiesBusinessLogic.Implementations;
+using Moq;
+using DaisiesContracts.StoragesContracts;
+using Microsoft.Extensions.Logging;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Enums;
+
+namespace DaisiesTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+internal class BouquetBusinessLogicContractTests
+{
+    private BouquetBusinessLogicContract _saleBusinessLogicContract;
+    private Mock<IBouquetStorageContract> _saleStorageContract;
+
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        _saleStorageContract = new Mock<IBouquetStorageContract>();
+        _saleBusinessLogicContract = new BouquetBusinessLogicContract(_saleStorageContract.Object, new Mock<ILogger>().Object);
+    }
+
+    [SetUp]
+    public void SetUp()
+    {
+        _saleStorageContract.Reset();
+    }
+
+    [Test]
+    public void GetAllBouquetsByPeriod_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        var listOriginal = new List<BouquetDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Special,
+                [new BouquetItemDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 5)]),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Special, []),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Special, []),
+        };
+        _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.GetAllBouquetsByPeriod(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 GetAllBouquetsByPeriod_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.GetAllBouquetsByPeriod(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 GetAllBouquetsByPeriod_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByPeriod(date, date), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByPeriod(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 GetAllBouquetsByPeriod_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByPeriod(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 GetAllBouquetsByPeriod_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.GetAllBouquetsByPeriod(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 GetAllBouquetsByEmployeerByPeriod_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        var workerId = Guid.NewGuid().ToString();
+        var listOriginal = new List<BouquetDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Special,
+                [new BouquetItemDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 5)]),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Special, []),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Special, []),
+        };
+        _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.GetAllBouquetsByEmployeerByPeriod(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 GetAllBouquetsByEmployeerByPeriod_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.GetAllBouquetsByEmployeerByPeriod(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 GetAllBouquetsByEmployeerByPeriod_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByEmployeerByPeriod(Guid.NewGuid().ToString(), date, date), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByEmployeerByPeriod(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 GetAllBouquetsByEmployeerByPeriod_WorkerIdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByEmployeerByPeriod(null, DateTime.UtcNow, DateTime.UtcNow.AddDays(1)), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByEmployeerByPeriod(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 GetAllBouquetsByEmployeerByPeriod_WorkerIdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByEmployeerByPeriod("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 GetAllBouquetsByEmployeerByPeriod_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByEmployeerByPeriod(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 GetAllBouquetsByEmployeerByPeriod_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.GetAllBouquetsByEmployeerByPeriod(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 GetAllBouquetsByCustomerByPeriod_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        var buyerId = Guid.NewGuid().ToString();
+        var listOriginal = new List<BouquetDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Special,
+                [new BouquetItemDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 5)]),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Special, []),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Special, []),
+        };
+        _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.GetAllBouquetsByCustomerByPeriod(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 GetAllBouquetsByCustomerByPeriod_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.GetAllBouquetsByCustomerByPeriod(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 GetAllBouquetsByCustomerByPeriod_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByCustomerByPeriod(Guid.NewGuid().ToString(), date, date), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByCustomerByPeriod(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 GetAllBouquetsByCustomerByPeriod_BuyerIdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByCustomerByPeriod(null, DateTime.UtcNow, DateTime.UtcNow.AddDays(1)), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByCustomerByPeriod(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 GetAllBouquetsByCustomerByPeriod_BuyerIdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByCustomerByPeriod("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 GetAllBouquetsByCustomerByPeriod_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByCustomerByPeriod(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 GetAllBouquetsByCustomerByPeriod_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.GetAllBouquetsByCustomerByPeriod(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 GetAllBouquetsByFlowerByPeriod_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        var productId = Guid.NewGuid().ToString();
+        var listOriginal = new List<BouquetDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Special,
+                [new BouquetItemDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 5)]),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Special, []),
+            new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Special, []),
+        };
+        _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.GetAllBouquetsByFlowerByPeriod(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 GetAllBouquetsByFlowerByPeriod_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.GetAllBouquetsByFlowerByPeriod(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 GetAllBouquetsByFlowerByPeriod_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByFlowerByPeriod(Guid.NewGuid().ToString(), date, date), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByFlowerByPeriod(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 GetAllBouquetsByFlowerByPeriod_ProductIdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByFlowerByPeriod(null, DateTime.UtcNow, DateTime.UtcNow.AddDays(1)), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByFlowerByPeriod(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 GetAllBouquetsByFlowerByPeriod_ProductIdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByFlowerByPeriod("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 GetAllBouquetsByFlowerByPeriod_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetAllBouquetsByFlowerByPeriod(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 GetAllBouquetsByFlowerByPeriod_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.GetAllBouquetsByFlowerByPeriod(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 GetBouquetByData_GetById_ReturnRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var record = new BouquetDataModel(id, Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "Name1", DateTime.UtcNow, BouquetType.Special,
+                [new BouquetItemDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 5)]);
+        _saleStorageContract.Setup(x => x.GetElementById(id)).Returns(record);
+        //Act
+        var element = _saleBusinessLogicContract.GetBouquetByData(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 GetBouquetByData_EmptyData_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetBouquetByData(null), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _saleBusinessLogicContract.GetBouquetByData(string.Empty), Throws.TypeOf<ArgumentNullException>());
+        _saleStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetBouquetByData_IdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetBouquetByData("saleId"), Throws.TypeOf<ValidationException>());
+        _saleStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetBouquetByData_GetById_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetBouquetByData(Guid.NewGuid().ToString()), Throws.TypeOf<ElementNotFoundException>());
+        _saleStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetBouquetByData_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x => x.GetElementById(It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.GetBouquetByData(Guid.NewGuid().ToString()), Throws.TypeOf<StorageException>());
+        _saleStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void InsertBouquet_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new BouquetDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "Name1", DateTime.UtcNow, BouquetType.Special,
+            [new BouquetItemDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 5)]);
+        _saleStorageContract.Setup(x => x.AddElement(It.IsAny<BouquetDataModel>()))
+            .Callback((BouquetDataModel x) =>
+            {
+                flag = x.Id == record.Id && x.EmployeeId == record.EmployeeId && x.CustomerId == record.CustomerId &&
+                    x.CompositionDate == record.CompositionDate && x.Type == record.Type && x.Items.Count == record.Items.Count &&
+                    x.Items.First().FlowerId == record.Items.First().FlowerId &&
+                    x.Items.First().BouquetId == record.Items.First().BouquetId &&
+                    x.Items.First().Quantity == record.Items.First().Quantity;
+            });
+        //Act
+        _saleBusinessLogicContract.InsertBouquet(record);
+        //Assert
+        _saleStorageContract.Verify(x => x.AddElement(It.IsAny<BouquetDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+
+    [Test]
+    public void InsertBouquet_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x => x.AddElement(It.IsAny<BouquetDataModel>())).Throws(new ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.InsertBouquet(new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(),
+            Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Wedding, [new BouquetItemDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 5)])), Throws.TypeOf<ElementExistsException>());
+        _saleStorageContract.Verify(x => x.AddElement(It.IsAny<BouquetDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void InsertBouquet_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.InsertBouquet(null), Throws.TypeOf<ArgumentNullException>());
+        _saleStorageContract.Verify(x => x.AddElement(It.IsAny<BouquetDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void InsertBouquet_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.InsertBouquet(new BouquetDataModel("id", Guid.NewGuid().ToString(),
+            Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Wedding, [])), Throws.TypeOf<ValidationException>());
+        _saleStorageContract.Verify(x => x.AddElement(It.IsAny<BouquetDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void InsertBouquet_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _saleStorageContract.Setup(x => x.AddElement(It.IsAny<BouquetDataModel>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _saleBusinessLogicContract.InsertBouquet(new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(),
+            Guid.NewGuid().ToString(), "name1", DateTime.UtcNow, BouquetType.Wedding, [new BouquetItemDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 5)])), Throws.TypeOf<StorageException>());
+        _saleStorageContract.Verify(x => x.AddElement(It.IsAny<BouquetDataModel>()), 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.CancelBouquet(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.CancelBouquet(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.CancelBouquet(null), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _saleBusinessLogicContract.CancelBouquet(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.CancelBouquet("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.CancelBouquet(Guid.NewGuid().ToString()), Throws.TypeOf<StorageException>());
+        _saleStorageContract.Verify(x => x.DelElement(It.IsAny<string>()), Times.Once);
+    }
+}

DaisiesTests/BusinessLogicsContractsTests/CustomerBusinessLogicContractTests.cs

@@ -0,0 +1,350 @@
+using DaisiesBusinessLogic.Implementations;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.StoragesContracts;
+using Microsoft.Extensions.Logging;
+using Moq;
+
+namespace DaisiesTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+internal class CustomerBusinessLogicContractTests
+{
+    private CustomerBusinessLogicContract _buyerBusinessLogicContract;
+    private Mock<ICustomerStorageContract> _buyerStorageContract;
+
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        _buyerStorageContract = new Mock<ICustomerStorageContract>();
+        _buyerBusinessLogicContract = new CustomerBusinessLogicContract(_buyerStorageContract.Object, new Mock<ILogger>().Object);
+    }
+
+    [SetUp]
+    public void SetUp()
+    {
+        _buyerStorageContract.Reset();
+    }
+
+    [Test]
+    public void GetAllBuyers_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var listOriginal = new List<CustomerDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), "fio 1", "+7-111-111-11-11", DateTime.UtcNow),
+            new(Guid.NewGuid().ToString(), "fio 2", "+7-555-444-33-23", DateTime.UtcNow),
+            new(Guid.NewGuid().ToString(), "fio 3", "+7-777-777-7777", DateTime.UtcNow),
+        };
+        _buyerStorageContract.Setup(x => x.GetList()).Returns(listOriginal);
+        //Act
+        var list = _buyerBusinessLogicContract.GetAllCustomers();
+        //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.GetAllCustomers();
+        //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.GetAllCustomers(), 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.GetAllCustomers(), 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 CustomerDataModel(id, "fio", "+7-111-111-11-11", DateTime.UtcNow);
+        _buyerStorageContract.Setup(x => x.GetElementById(id)).Returns(record);
+        //Act
+        var element = _buyerBusinessLogicContract.GetCustomerByData(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 CustomerDataModel(Guid.NewGuid().ToString(), fio, "+7-111-111-11-11", DateTime.UtcNow);
+        _buyerStorageContract.Setup(x => x.GetElementByFullName(fio)).Returns(record);
+        //Act
+        var element = _buyerBusinessLogicContract.GetCustomerByData(fio);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.FullName, Is.EqualTo(fio));
+        _buyerStorageContract.Verify(x => x.GetElementByFullName(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetBuyerByData_GetByPhoneNumber_ReturnRecord_Test()
+    {
+        //Arrange
+        var phoneNumber = "+7-111-111-11-11";
+        var record = new CustomerDataModel(Guid.NewGuid().ToString(), "fio", phoneNumber, DateTime.UtcNow);
+        _buyerStorageContract.Setup(x => x.GetElementByPhoneNumber(phoneNumber)).Returns(record);
+        //Act
+        var element = _buyerBusinessLogicContract.GetCustomerByData(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.GetCustomerByData(null), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _buyerBusinessLogicContract.GetCustomerByData(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.GetElementByFullName(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetBuyerByData_GetById_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.GetCustomerByData(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.GetElementByFullName(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetBuyerByData_GetByFio_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.GetCustomerByData("fio"), Throws.TypeOf<ElementNotFoundException>());
+        _buyerStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Never);
+        _buyerStorageContract.Verify(x => x.GetElementByFullName(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.GetCustomerByData("+7-111-111-11-12"), Throws.TypeOf<ElementNotFoundException>());
+        _buyerStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Never);
+        _buyerStorageContract.Verify(x => x.GetElementByFullName(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.GetElementByFullName(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.GetCustomerByData(Guid.NewGuid().ToString()), Throws.TypeOf<StorageException>());
+        Assert.That(() => _buyerBusinessLogicContract.GetCustomerByData("fio"), Throws.TypeOf<StorageException>());
+        Assert.That(() => _buyerBusinessLogicContract.GetCustomerByData("+7-111-111-11-12"), Throws.TypeOf<StorageException>());
+        _buyerStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+        _buyerStorageContract.Verify(x => x.GetElementByFullName(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 CustomerDataModel(Guid.NewGuid().ToString(), "fio", "+7-111-111-11-11", DateTime.UtcNow);
+        _buyerStorageContract.Setup(x => x.AddElement(It.IsAny<CustomerDataModel>()))
+            .Callback((CustomerDataModel x) =>
+            {
+                flag = x.Id == record.Id && x.FullName == record.FullName &&
+                    x.PhoneNumber == record.PhoneNumber && x.RegistrationDate == record.RegistrationDate;
+            });
+        //Act
+        _buyerBusinessLogicContract.InsertCustomer(record);
+        //Assert
+        _buyerStorageContract.Verify(x => x.AddElement(It.IsAny<CustomerDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+
+    [Test]
+    public void InsertBuyer_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x => x.AddElement(It.IsAny<CustomerDataModel>())).Throws(new ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.InsertCustomer(new(Guid.NewGuid().ToString(), "fio", "+7-111-111-11-11", DateTime.UtcNow)), Throws.TypeOf<ElementExistsException>());
+        _buyerStorageContract.Verify(x => x.AddElement(It.IsAny<CustomerDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void InsertBuyer_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.InsertCustomer(null), Throws.TypeOf<ArgumentNullException>());
+        _buyerStorageContract.Verify(x => x.AddElement(It.IsAny<CustomerDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void InsertBuyer_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.InsertCustomer(new CustomerDataModel("id", "fio", "+7-111-111-11-11", DateTime.UtcNow)), Throws.TypeOf<ValidationException>());
+        _buyerStorageContract.Verify(x => x.AddElement(It.IsAny<CustomerDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void InsertBuyer_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x => x.AddElement(It.IsAny<CustomerDataModel>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.InsertCustomer(new(Guid.NewGuid().ToString(), "fio", "+7-111-111-11-11", DateTime.UtcNow)), Throws.TypeOf<StorageException>());
+        _buyerStorageContract.Verify(x => x.AddElement(It.IsAny<CustomerDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void UpdateBuyer_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new CustomerDataModel(Guid.NewGuid().ToString(), "fio", "+7-111-111-11-11", DateTime.UtcNow);
+        _buyerStorageContract.Setup(x => x.UpdElement(It.IsAny<CustomerDataModel>()))
+            .Callback((CustomerDataModel x) =>
+            {
+                flag = x.Id == record.Id && x.FullName == record.FullName &&
+                    x.PhoneNumber == record.PhoneNumber && x.RegistrationDate == record.RegistrationDate;
+            });
+        //Act
+        _buyerBusinessLogicContract.UpdateCustomer(record);
+        //Assert
+        _buyerStorageContract.Verify(x => x.UpdElement(It.IsAny<CustomerDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+
+    [Test]
+    public void UpdateBuyer_RecordWithIncorrectData_ThrowException_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x => x.UpdElement(It.IsAny<CustomerDataModel>())).Throws(new ElementNotFoundException(""));
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.UpdateCustomer(new(Guid.NewGuid().ToString(), "fio", "+7-111-111-11-11", DateTime.UtcNow)), Throws.TypeOf<ElementNotFoundException>());
+        _buyerStorageContract.Verify(x => x.UpdElement(It.IsAny<CustomerDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void UpdateBuyer_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x => x.UpdElement(It.IsAny<CustomerDataModel>())).Throws(new ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.UpdateCustomer(new(Guid.NewGuid().ToString(), "fio", "+7-111-111-11-11", DateTime.UtcNow)), Throws.TypeOf<ElementExistsException>());
+        _buyerStorageContract.Verify(x => x.UpdElement(It.IsAny<CustomerDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void UpdateBuyer_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.UpdateCustomer(null), Throws.TypeOf<ArgumentNullException>());
+        _buyerStorageContract.Verify(x => x.UpdElement(It.IsAny<CustomerDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void UpdateBuyer_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.UpdateCustomer(new CustomerDataModel("id", "fio", "+7-111-111-11-11", DateTime.UtcNow)), Throws.TypeOf<ValidationException>());
+        _buyerStorageContract.Verify(x => x.UpdElement(It.IsAny<CustomerDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void UpdateBuyer_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _buyerStorageContract.Setup(x => x.UpdElement(It.IsAny<CustomerDataModel>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _buyerBusinessLogicContract.UpdateCustomer(new(Guid.NewGuid().ToString(), "fio", "+7-111-111-11-11", DateTime.UtcNow)), Throws.TypeOf<StorageException>());
+        _buyerStorageContract.Verify(x => x.UpdElement(It.IsAny<CustomerDataModel>()), 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.DeleteCustomer(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.DeleteCustomer(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.DeleteCustomer(null), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _buyerBusinessLogicContract.DeleteCustomer(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.DeleteCustomer("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.DeleteCustomer(Guid.NewGuid().ToString()), Throws.TypeOf<StorageException>());
+        _buyerStorageContract.Verify(x => x.DelElement(It.IsAny<string>()), Times.Once);
+    }
+}

DaisiesTests/BusinessLogicsContractsTests/CustomerDiscountBusinessLogicContractTests.cs

@@ -0,0 +1,303 @@
+using DaisiesBusinessLogic.Implementations;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Enums;
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.StoragesContracts;
+using Microsoft.Extensions.Logging;
+using Moq;
+
+namespace DaisiesTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+internal class CustomerDiscountBusinessLogicContractTests
+{
+    private CustomerDiscountBusinessLogicContract _salaryBusinessLogicContract;
+    private Mock<ICustomerDiscountStorageContract> _salaryStorageContract;
+    private Mock<IBouquetStorageContract> _saleStorageContract;
+    private Mock<ICustomerStorageContract> _workerStorageContract;
+
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        _salaryStorageContract = new Mock<ICustomerDiscountStorageContract>();
+        _saleStorageContract = new Mock<IBouquetStorageContract>();
+        _workerStorageContract = new Mock<ICustomerStorageContract>();
+        _salaryBusinessLogicContract = new CustomerDiscountBusinessLogicContract(_salaryStorageContract.Object,
+            _saleStorageContract.Object, _workerStorageContract.Object, new Mock<ILogger>().Object);
+    }
+
+    [SetUp]
+    public void SetUp()
+    {
+        _salaryStorageContract.Reset();
+        _saleStorageContract.Reset();
+        _workerStorageContract.Reset();
+    }
+
+    [Test]
+    public void GetAllSalaries_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var startDate = DateTime.UtcNow;
+        var endDate = DateTime.UtcNow.AddDays(1);
+        var listOriginal = new List<CustomerDiscountDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), DateTime.UtcNow, 10),
+            new(Guid.NewGuid().ToString(), DateTime.UtcNow.AddDays(1), 14),
+            new(Guid.NewGuid().ToString(), DateTime.UtcNow.AddDays(-1), 30),
+        };
+        _salaryStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>())).Returns(listOriginal);
+        //Act
+        var list = _salaryBusinessLogicContract.GetAllDiscountsByPeriod(startDate, endDate);
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+        _salaryStorageContract.Verify(x => x.GetList(startDate, endDate, null), Times.Once);
+    }
+
+    [Test]
+    public void GetAllSalaries_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _salaryStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>())).Returns([]);
+        //Act
+        var list = _salaryBusinessLogicContract.GetAllDiscountsByPeriod(DateTime.UtcNow, DateTime.UtcNow.AddDays(1));
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetAllSalaries_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var dateTime = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() => _salaryBusinessLogicContract.GetAllDiscountsByPeriod(dateTime, dateTime), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() => _salaryBusinessLogicContract.GetAllDiscountsByPeriod(dateTime, dateTime.AddSeconds(-1)), Throws.TypeOf<IncorrectDatesException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetAllSalaries_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _salaryBusinessLogicContract.GetAllDiscountsByPeriod(DateTime.UtcNow, DateTime.UtcNow.AddDays(1)), Throws.TypeOf<NullListException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetAllSalaries_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _salaryStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _salaryBusinessLogicContract.GetAllDiscountsByPeriod(DateTime.UtcNow, DateTime.UtcNow.AddDays(1)), Throws.TypeOf<StorageException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetAllSalariesByWorker_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var startDate = DateTime.UtcNow;
+        var endDate = DateTime.UtcNow.AddDays(1);
+        var workerId = Guid.NewGuid().ToString();
+        var listOriginal = new List<CustomerDiscountDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), DateTime.UtcNow, 10),
+            new(Guid.NewGuid().ToString(), DateTime.UtcNow.AddDays(1), 14),
+            new(Guid.NewGuid().ToString(), DateTime.UtcNow.AddDays(-1), 30),
+        };
+        _salaryStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>())).Returns(listOriginal);
+        //Act
+        var list = _salaryBusinessLogicContract.GetAllDiscountsByPeriodByCustomer(startDate, endDate, workerId);
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.EquivalentTo(listOriginal));
+        _salaryStorageContract.Verify(x => x.GetList(startDate, endDate, workerId), Times.Once);
+    }
+
+    [Test]
+    public void GetAllSalariesByWorker_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _salaryStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>())).Returns([]);
+        //Act
+        var list = _salaryBusinessLogicContract.GetAllDiscountsByPeriodByCustomer(DateTime.UtcNow, DateTime.UtcNow.AddDays(1), Guid.NewGuid().ToString());
+        //Assert
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(0));
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetAllSalariesByWorker_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var dateTime = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() => _salaryBusinessLogicContract.GetAllDiscountsByPeriodByCustomer(dateTime, dateTime, Guid.NewGuid().ToString()), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() => _salaryBusinessLogicContract.GetAllDiscountsByPeriodByCustomer(dateTime, dateTime.AddSeconds(-1), Guid.NewGuid().ToString()), Throws.TypeOf<IncorrectDatesException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetAllSalariesByWorker_WorkerIdIsNUllOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _salaryBusinessLogicContract.GetAllDiscountsByPeriodByCustomer(DateTime.UtcNow, DateTime.UtcNow.AddDays(1), null), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _salaryBusinessLogicContract.GetAllDiscountsByPeriodByCustomer(DateTime.UtcNow, DateTime.UtcNow.AddDays(1), string.Empty), Throws.TypeOf<ArgumentNullException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetAllSalariesByWorker_WorkerIdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _salaryBusinessLogicContract.GetAllDiscountsByPeriodByCustomer(DateTime.UtcNow, DateTime.UtcNow.AddDays(1), "workerId"), Throws.TypeOf<ValidationException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetAllSalariesByWorker_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _salaryBusinessLogicContract.GetAllDiscountsByPeriodByCustomer(DateTime.UtcNow, DateTime.UtcNow.AddDays(1), Guid.NewGuid().ToString()), Throws.TypeOf<NullListException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetAllSalariesByWorker_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _salaryStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _salaryBusinessLogicContract.GetAllDiscountsByPeriodByCustomer(DateTime.UtcNow, DateTime.UtcNow.AddDays(1), Guid.NewGuid().ToString()), Throws.TypeOf<StorageException>());
+        _salaryStorageContract.Verify(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void CalculateSalaryByMounth_CalculateSalary_Test()
+    {
+        //Arrange
+        var workerId = Guid.NewGuid().ToString();
+        var saleSum = 0.0;
+        var postSalary = 0.0;
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>()))
+            .Returns([new BouquetDataModel(Guid.NewGuid().ToString(), workerId, workerId, "Name", DateTime.UtcNow, BouquetType.Standard, [])]);
+        _workerStorageContract.Setup(x => x.GetList())
+            .Returns([new CustomerDataModel(workerId, "Full Name", "+79999999999", DateTime.UtcNow)]);
+        var sum = 0.0;
+        var expectedSum = postSalary + saleSum * 0.1;
+        _salaryStorageContract.Setup(x => x.AddElement(It.IsAny<CustomerDiscountDataModel>()))
+            .Callback((CustomerDiscountDataModel x) =>
+            {
+                sum = (double)x.Discount;
+            });
+        //Act
+        _salaryBusinessLogicContract.CalculateDiscountByMounth(DateTime.UtcNow);
+        //Assert
+        Assert.That(sum, Is.EqualTo(expectedSum));
+    }
+
+    [Test]
+    public void CalculateSalaryByMounth_WithSeveralWorkers_Test()
+    {
+        //Arrange
+        var worker1Id = Guid.NewGuid().ToString();
+        var worker2Id = Guid.NewGuid().ToString();
+        var worker3Id = Guid.NewGuid().ToString();
+        var list = new List<CustomerDataModel>() {
+            new(worker1Id, "Full Name", "+79999999999", DateTime.UtcNow),
+            new(worker2Id, "Full Name", "+79999999999", DateTime.UtcNow),
+            new(worker3Id, "Full Name", "+79999999999", DateTime.UtcNow)
+        };
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>()))
+            .Returns([
+                new BouquetDataModel(Guid.NewGuid().ToString(), worker1Id, worker1Id, "Name", DateTime.UtcNow, BouquetType.Standard, []),
+                new BouquetDataModel(Guid.NewGuid().ToString(), worker2Id, worker2Id, "Name", DateTime.UtcNow, BouquetType.Standard, []),
+                new BouquetDataModel(Guid.NewGuid().ToString(), worker2Id, worker2Id, "Name", DateTime.UtcNow, BouquetType.Standard, []),
+                new BouquetDataModel(Guid.NewGuid().ToString(), worker3Id, worker3Id, "Name", DateTime.UtcNow, BouquetType.Standard, []),
+                new BouquetDataModel(Guid.NewGuid().ToString(), worker3Id, worker3Id, "Name", DateTime.UtcNow, BouquetType.Standard, [])
+                ]);
+        _workerStorageContract.Setup(x => x.GetList())
+            .Returns(list);
+        //Act
+        _salaryBusinessLogicContract.CalculateDiscountByMounth(DateTime.UtcNow);
+        //Assert
+        _salaryStorageContract.Verify(x => x.AddElement(It.IsAny<CustomerDiscountDataModel>()), Times.Exactly(list.Count));
+    }
+
+    [Test]
+    public void CalculateSalaryByMounth_WithoitSalesByWorker_Test()
+    {
+        //Arrange
+        var postSalary = 0.0;
+        var workerId = Guid.NewGuid().ToString();
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>()))
+            .Returns([]);
+        _workerStorageContract.Setup(x => x.GetList())
+            .Returns([new CustomerDataModel(workerId, "Full Name", "+79999999999", DateTime.UtcNow)]);
+        var sum = 0.0;
+        var expectedSum = postSalary;
+        _salaryStorageContract.Setup(x => x.AddElement(It.IsAny<CustomerDiscountDataModel>()))
+            .Callback((CustomerDiscountDataModel x) =>
+            {
+                sum = (double)x.Discount;
+            });
+        //Act
+        _salaryBusinessLogicContract.CalculateDiscountByMounth(DateTime.UtcNow);
+        //Assert
+        Assert.That(sum, Is.EqualTo(expectedSum));
+    }
+
+    [Test]
+    public void CalculateSalaryByMounth_SaleStorageReturnNull_ThrowException_Test()
+    {
+        //Arrange
+        var workerId = Guid.NewGuid().ToString();
+        _workerStorageContract.Setup(x => x.GetList())
+            .Returns([new CustomerDataModel(workerId, "Full Name", "+79999999999", DateTime.UtcNow)]);
+        //Act&Assert
+        Assert.That(() => _salaryBusinessLogicContract.CalculateDiscountByMounth(DateTime.UtcNow), Throws.TypeOf<NullListException>());
+    }
+
+    [Test]
+    public void CalculateSalaryByMounth_WorkerStorageReturnNull_ThrowException_Test()
+    {
+        //Arrange
+        var workerId = Guid.NewGuid().ToString();
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>()))
+            .Returns([new BouquetDataModel(Guid.NewGuid().ToString(), workerId, workerId, "Name", DateTime.UtcNow, BouquetType.Standard, [])]);
+        //Act&Assert
+        Assert.That(() => _salaryBusinessLogicContract.CalculateDiscountByMounth(DateTime.UtcNow), Throws.TypeOf<NullListException>());
+    }
+
+    [Test]
+    public void CalculateSalaryByMounth_SaleStorageThrowException_ThrowException_Test()
+    {
+        //Arrange
+        var workerId = Guid.NewGuid().ToString();
+        _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()));
+        _workerStorageContract.Setup(x => x.GetList())
+            .Returns([new CustomerDataModel(workerId, "Full Name", "+79999999999", DateTime.UtcNow)]);
+        //Act&Assert
+        Assert.That(() => _salaryBusinessLogicContract.CalculateDiscountByMounth(DateTime.UtcNow), Throws.TypeOf<StorageException>());
+    }
+
+    [Test]
+    public void CalculateSalaryByMounth_WorkerStorageThrowException_ThrowException_Test()
+    {
+        //Arrange
+        var workerId = Guid.NewGuid().ToString();
+        _saleStorageContract.Setup(x => x.GetList(It.IsAny<DateTime>(), It.IsAny<DateTime>(), It.IsAny<string>(), It.IsAny<string>(), It.IsAny<string>()))
+            .Returns([new BouquetDataModel(Guid.NewGuid().ToString(), workerId, workerId, "Name", DateTime.UtcNow, BouquetType.Standard, [])]);
+        _workerStorageContract.Setup(x => x.GetList())
+            .Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _salaryBusinessLogicContract.CalculateDiscountByMounth(DateTime.UtcNow), Throws.TypeOf<StorageException>());
+    }
+}

DaisiesTests/BusinessLogicsContractsTests/EmployeeBusinessLogicContractTests.cs

@@ -0,0 +1,401 @@
+using DaisiesBusinessLogic.Implementations;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Enums;
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.StoragesContracts;
+using Microsoft.Extensions.Logging;
+using Moq;
+
+namespace DaisiesTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+internal class EmployeeBusinessLogicContractTests
+{
+    private EmployeeBusinessLogicContract _workerBusinessLogicContract;
+    private Mock<IEmployeeStorageContract> _workerStorageContract;
+
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        _workerStorageContract = new Mock<IEmployeeStorageContract>();
+        _workerBusinessLogicContract = new EmployeeBusinessLogicContract(_workerStorageContract.Object, new Mock<ILogger>().Object);
+    }
+
+    [SetUp]
+    public void SetUp()
+    {
+        _workerStorageContract.Reset();
+    }
+
+    [Test]
+    public void GetAllEmployeers_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var listOriginal = new List<EmployeeDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), "fio 1", EmployeeRole.Helper, DateTime.Now, false),
+            new(Guid.NewGuid().ToString(), "fio 2", EmployeeRole.Helper, DateTime.Now, true),
+            new(Guid.NewGuid().ToString(), "fio 3", EmployeeRole.Helper, DateTime.Now, false),
+        };
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Returns(listOriginal);
+        //Act
+        var listOnlyActive = _workerBusinessLogicContract.GetAllEmployeers(true);
+        var list = _workerBusinessLogicContract.GetAllEmployeers(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), Times.Once);
+        _workerStorageContract.Verify(x => x.GetList(false, null, null), Times.Once);
+    }
+
+    [Test]
+    public void GetAllEmployeers_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Returns([]);
+        //Act
+        var listOnlyActive = _workerBusinessLogicContract.GetAllEmployeers(true);
+        var list = _workerBusinessLogicContract.GetAllEmployeers(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), Times.Exactly(2));
+    }
+
+    [Test]
+    public void GetAllEmployeers_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.GetAllEmployeers(It.IsAny<bool>()), Throws.TypeOf<NullListException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Once);
+    }
+
+    [Test]
+    public void GetAllEmployeers_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.GetAllEmployeers(It.IsAny<bool>()), Throws.TypeOf<StorageException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(), null, null), Times.Once);
+    }
+
+    [Test]
+    public void GetAllEmployeersByEmploymentDate_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        var listOriginal = new List<EmployeeDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), "fio 1", EmployeeRole.Helper, DateTime.Now, false),
+            new(Guid.NewGuid().ToString(), "fio 2", EmployeeRole.Helper, DateTime.Now, true),
+            new(Guid.NewGuid().ToString(), "fio 3", EmployeeRole.Helper, DateTime.Now, false),
+        };
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Returns(listOriginal);
+        //Act
+        var listOnlyActive = _workerBusinessLogicContract.GetAllEmployeersByEmploymentDate(date, date.AddDays(1), true);
+        var list = _workerBusinessLogicContract.GetAllEmployeersByEmploymentDate(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, date, date.AddDays(1)), Times.Once);
+        _workerStorageContract.Verify(x => x.GetList(false, date, date.AddDays(1)), Times.Once);
+    }
+
+    [Test]
+    public void GetAllEmployeersByEmploymentDate_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Returns([]);
+        //Act
+        var listOnlyActive = _workerBusinessLogicContract.GetAllEmployeersByEmploymentDate(DateTime.UtcNow, DateTime.UtcNow.AddDays(1), true);
+        var list = _workerBusinessLogicContract.GetAllEmployeersByEmploymentDate(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, It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Once);
+        _workerStorageContract.Verify(x => x.GetList(false, It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Once);
+    }
+
+    [Test]
+    public void GetAllEmployeersByEmploymentDate_IncorrectDates_ThrowException_Test()
+    {
+        //Arrange
+        var date = DateTime.UtcNow;
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.GetAllEmployeersByEmploymentDate(date, date, It.IsAny<bool>()), Throws.TypeOf<IncorrectDatesException>());
+        Assert.That(() => _workerBusinessLogicContract.GetAllEmployeersByEmploymentDate(date, date.AddSeconds(-1), It.IsAny<bool>()), Throws.TypeOf<IncorrectDatesException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Never);
+    }
+
+    [Test]
+    public void GetAllEmployeersByEmploymentDate_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.GetAllEmployeersByEmploymentDate(DateTime.UtcNow, DateTime.UtcNow.AddDays(1), It.IsAny<bool>()), Throws.TypeOf<NullListException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Once);
+    }
+
+    [Test]
+    public void GetAllEmployeersByEmploymentDate_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.GetList(It.IsAny<bool>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.GetAllEmployeersByEmploymentDate(DateTime.UtcNow, DateTime.UtcNow.AddDays(1), It.IsAny<bool>()), Throws.TypeOf<StorageException>());
+        _workerStorageContract.Verify(x => x.GetList(It.IsAny<bool>(), It.IsAny<DateTime?>(), It.IsAny<DateTime?>()), Times.Once);
+    }
+
+    [Test]
+    public void GetWorkerByData_GetById_ReturnRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var record = new EmployeeDataModel(id, "fio", EmployeeRole.Administrator, DateTime.Now, false);
+        _workerStorageContract.Setup(x => x.GetElementById(id)).Returns(record);
+        //Act
+        var element = _workerBusinessLogicContract.GetEmployeerByData(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 EmployeeDataModel(Guid.NewGuid().ToString(), fio, EmployeeRole.Administrator, DateTime.Now, false);
+        _workerStorageContract.Setup(x => x.GetElementByFullName(fio)).Returns(record);
+        //Act
+        var element = _workerBusinessLogicContract.GetEmployeerByData(fio);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.FullName, Is.EqualTo(fio));
+        _workerStorageContract.Verify(x => x.GetElementByFullName(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetWorkerByData_EmptyData_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.GetEmployeerByData(null), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _workerBusinessLogicContract.GetEmployeerByData(string.Empty), Throws.TypeOf<ArgumentNullException>());
+        _workerStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Never);
+        _workerStorageContract.Verify(x => x.GetElementByFullName(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetWorkerByData_GetById_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.GetEmployeerByData(Guid.NewGuid().ToString()), Throws.TypeOf<ElementNotFoundException>());
+        _workerStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+        _workerStorageContract.Verify(x => x.GetElementByFullName(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetWorkerByData_GetByFio_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.GetEmployeerByData("fio"), Throws.TypeOf<ElementNotFoundException>());
+        _workerStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Never);
+        _workerStorageContract.Verify(x => x.GetElementByFullName(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.GetElementByFullName(It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.GetEmployeerByData(Guid.NewGuid().ToString()), Throws.TypeOf<StorageException>());
+        Assert.That(() => _workerBusinessLogicContract.GetEmployeerByData("fio"), Throws.TypeOf<StorageException>());
+        _workerStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+        _workerStorageContract.Verify(x => x.GetElementByFullName(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void InsertWorker_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new EmployeeDataModel(Guid.NewGuid().ToString(), "Full Name", EmployeeRole.Administrator, DateTime.Now, false);
+        _workerStorageContract.Setup(x => x.AddElement(It.IsAny<EmployeeDataModel>()))
+            .Callback((EmployeeDataModel x) =>
+            {
+                flag = x.Id == record.Id && x.FullName == record.FullName && x.Role == record.Role &&
+                    x.EmploymentDate == record.EmploymentDate && x.IsActive == record.IsActive;
+            });
+        //Act
+        _workerBusinessLogicContract.InsertEmployeer(record);
+        //Assert
+        _workerStorageContract.Verify(x => x.AddElement(It.IsAny<EmployeeDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+
+    [Test]
+    public void InsertWorker_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.AddElement(It.IsAny<EmployeeDataModel>())).Throws(new ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.InsertEmployeer(new(Guid.NewGuid().ToString(), "Full Name", EmployeeRole.Administrator, DateTime.Now, false)), Throws.TypeOf<ElementExistsException>());
+        _workerStorageContract.Verify(x => x.AddElement(It.IsAny<EmployeeDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void InsertWorker_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.InsertEmployeer(null), Throws.TypeOf<ArgumentNullException>());
+        _workerStorageContract.Verify(x => x.AddElement(It.IsAny<EmployeeDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void InsertWorker_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.InsertEmployeer(new EmployeeDataModel("id", "fio", EmployeeRole.Administrator, DateTime.Now, false)), Throws.TypeOf<ValidationException>());
+        _workerStorageContract.Verify(x => x.AddElement(It.IsAny<EmployeeDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void InsertWorker_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.AddElement(It.IsAny<EmployeeDataModel>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.InsertEmployeer(new(Guid.NewGuid().ToString(), "Full Name", EmployeeRole.Administrator, DateTime.Now, false)), Throws.TypeOf<StorageException>());
+        _workerStorageContract.Verify(x => x.AddElement(It.IsAny<EmployeeDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void UpdateWorker_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new EmployeeDataModel(Guid.NewGuid().ToString(), "Full Name", EmployeeRole.Administrator, DateTime.Now, false);
+        _workerStorageContract.Setup(x => x.UpdElement(It.IsAny<EmployeeDataModel>()))
+            .Callback((EmployeeDataModel x) =>
+            {
+                flag = x.Id == record.Id && x.FullName == record.FullName && x.Role == record.Role &&
+                    x.EmploymentDate == record.EmploymentDate && x.IsActive == record.IsActive;
+            });
+        //Act
+        _workerBusinessLogicContract.UpdateEmployeer(record);
+        //Assert
+        _workerStorageContract.Verify(x => x.UpdElement(It.IsAny<EmployeeDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+
+    [Test]
+    public void UpdateWorker_RecordWithIncorrectData_ThrowException_Test()
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.UpdElement(It.IsAny<EmployeeDataModel>())).Throws(new ElementNotFoundException(""));
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.UpdateEmployeer(new(Guid.NewGuid().ToString(), "Full Name", EmployeeRole.Administrator, DateTime.Now, false)), Throws.TypeOf<ElementNotFoundException>());
+        _workerStorageContract.Verify(x => x.UpdElement(It.IsAny<EmployeeDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void UpdateWorker_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.UpdateEmployeer(null), Throws.TypeOf<ArgumentNullException>());
+        _workerStorageContract.Verify(x => x.UpdElement(It.IsAny<EmployeeDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void UpdateWorker_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.UpdateEmployeer(new EmployeeDataModel("id", "fio", EmployeeRole.Administrator, DateTime.Now, false)), Throws.TypeOf<ValidationException>());
+        _workerStorageContract.Verify(x => x.UpdElement(It.IsAny<EmployeeDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void UpdateWorker_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _workerStorageContract.Setup(x => x.UpdElement(It.IsAny<EmployeeDataModel>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _workerBusinessLogicContract.UpdateEmployeer(new(Guid.NewGuid().ToString(), "Full Name", EmployeeRole.Administrator, DateTime.Now, false)), Throws.TypeOf<StorageException>());
+        _workerStorageContract.Verify(x => x.UpdElement(It.IsAny<EmployeeDataModel>()), 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.DeleteEmployeer(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.DeleteEmployeer(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.DeleteEmployeer(null), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _workerBusinessLogicContract.DeleteEmployeer(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.DeleteEmployeer("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.DeleteEmployeer(Guid.NewGuid().ToString()), Throws.TypeOf<StorageException>());
+        _workerStorageContract.Verify(x => x.DelElement(It.IsAny<string>()), Times.Once);
+    }
+}

DaisiesTests/BusinessLogicsContractsTests/FlowerBusinessLogicContractTests.cs

@@ -0,0 +1,332 @@
+using DaisiesBusinessLogic.Implementations;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.StoragesContracts;
+using Microsoft.Extensions.Logging;
+using Moq;
+using static NUnit.Framework.Internal.OSPlatform;
+
+namespace DaisiesTests.BusinessLogicsContractsTests;
+
+[TestFixture]
+internal class FlowerBusinessLogicContractTests
+{
+    private FlowerBusinessLogicContract _productBusinessLogicContract;
+    private Mock<IFlowerStorageContract> _productStorageContract;
+
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        _productStorageContract = new Mock<IFlowerStorageContract>();
+        _productBusinessLogicContract = new FlowerBusinessLogicContract(_productStorageContract.Object, new Mock<ILogger>().Object);
+    }
+
+    [SetUp]
+    public void SetUp()
+    {
+        _productStorageContract.Reset();
+    }
+
+    [Test]
+    public void GetAllFlowers_ReturnListOfRecords_Test()
+    {
+        //Arrange
+        var listOriginal = new List<FlowerDataModel>()
+        {
+            new(Guid.NewGuid().ToString(), "name 1", 10),
+            new(Guid.NewGuid().ToString(), "name 2", 10),
+            new(Guid.NewGuid().ToString(), "name 3", 10),
+        };
+        _productStorageContract.Setup(x => x.GetList()).Returns(listOriginal);
+        //Act
+        var listOnlyActive = _productBusinessLogicContract.GetAllFlowers(true);
+        var list = _productBusinessLogicContract.GetAllFlowers(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));
+        });
+        _productStorageContract.Verify(x => x.GetList(), Times.Exactly(2));
+    }
+
+    [Test]
+    public void GetAllFlowers_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _productStorageContract.Setup(x => x.GetList()).Returns([]);
+        //Act
+        var listOnlyActive = _productBusinessLogicContract.GetAllFlowers(true);
+        var list = _productBusinessLogicContract.GetAllFlowers(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));
+        });
+        _productStorageContract.Verify(x => x.GetList(), Times.Exactly(2));
+    }
+
+    [Test]
+    public void GetAllFlowers_ReturnNull_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.GetAllFlowers(It.IsAny<bool>()), Throws.TypeOf<NullListException>());
+        _productStorageContract.Verify(x => x.GetList(), Times.Once);
+    }
+
+    [Test]
+    public void GetAllFlowers_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _productStorageContract.Setup(x => x.GetList()).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.GetAllFlowers(It.IsAny<bool>()), Throws.TypeOf<StorageException>());
+        _productStorageContract.Verify(x => x.GetList(), Times.Once);
+    }
+
+    [Test]
+    public void GetProductByData_GetById_ReturnRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var record = new FlowerDataModel(id, "name", 10);
+        _productStorageContract.Setup(x => x.GetElementById(id)).Returns(record);
+        //Act
+        var element = _productBusinessLogicContract.GetFlowerByData(id);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.Id, Is.EqualTo(id));
+        _productStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetProductByData_GetByName_ReturnRecord_Test()
+    {
+        //Arrange
+        var name = "name";
+        var record = new FlowerDataModel(Guid.NewGuid().ToString(), name, 10);
+        _productStorageContract.Setup(x => x.GetElementByName(name)).Returns(record);
+        //Act
+        var element = _productBusinessLogicContract.GetFlowerByData(name);
+        //Assert
+        Assert.That(element, Is.Not.Null);
+        Assert.That(element.Name, Is.EqualTo(name));
+        _productStorageContract.Verify(x => x.GetElementByName(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetProductByData_EmptyData_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.GetFlowerByData(null), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _productBusinessLogicContract.GetFlowerByData(string.Empty), Throws.TypeOf<ArgumentNullException>());
+        _productStorageContract.Verify(x => x.GetElementByName(It.IsAny<string>()), Times.Never);
+        _productStorageContract.Verify(x => x.GetElementByName(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void GetProductByData_GetById_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.GetFlowerByData(Guid.NewGuid().ToString()), Throws.TypeOf<ElementNotFoundException>());
+        _productStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetProductByData_GetByName_NotFoundRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.GetFlowerByData("name"), Throws.TypeOf<ElementNotFoundException>());
+        _productStorageContract.Verify(x => x.GetElementByName(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void GetProductByData_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _productStorageContract.Setup(x => x.GetElementById(It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+        _productStorageContract.Setup(x => x.GetElementByName(It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.GetFlowerByData(Guid.NewGuid().ToString()), Throws.TypeOf<StorageException>());
+        Assert.That(() => _productBusinessLogicContract.GetFlowerByData("name"), Throws.TypeOf<StorageException>());
+        _productStorageContract.Verify(x => x.GetElementById(It.IsAny<string>()), Times.Once);
+        _productStorageContract.Verify(x => x.GetElementByName(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void InsertProduct_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new FlowerDataModel(Guid.NewGuid().ToString(), "name", 10);
+        _productStorageContract.Setup(x => x.AddElement(It.IsAny<FlowerDataModel>()))
+            .Callback((FlowerDataModel x) =>
+            {
+                flag = x.Id == record.Id && x.Name == record.Name &&
+                x.Price == record.Price;
+            });
+        //Act
+        _productBusinessLogicContract.InsertFlower(record);
+        //Assert
+        _productStorageContract.Verify(x => x.AddElement(It.IsAny<FlowerDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+
+    [Test]
+    public void InsertProduct_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _productStorageContract.Setup(x => x.AddElement(It.IsAny<FlowerDataModel>())).Throws(new ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.InsertFlower(new(Guid.NewGuid().ToString(), "name", 10)), Throws.TypeOf<ElementExistsException>());
+        _productStorageContract.Verify(x => x.AddElement(It.IsAny<FlowerDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void InsertProduct_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.InsertFlower(null), Throws.TypeOf<ArgumentNullException>());
+        _productStorageContract.Verify(x => x.AddElement(It.IsAny<FlowerDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void InsertProduct_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.InsertFlower(new FlowerDataModel("id", "name", 10)), Throws.TypeOf<ValidationException>());
+        _productStorageContract.Verify(x => x.AddElement(It.IsAny<FlowerDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void InsertProduct_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _productStorageContract.Setup(x => x.AddElement(It.IsAny<FlowerDataModel>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.InsertFlower(new(Guid.NewGuid().ToString(), "name", 10)), Throws.TypeOf<StorageException>());
+        _productStorageContract.Verify(x => x.AddElement(It.IsAny<FlowerDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void UpdateProduct_CorrectRecord_Test()
+    {
+        //Arrange
+        var flag = false;
+        var record = new FlowerDataModel(Guid.NewGuid().ToString(), "name", 10);
+        _productStorageContract.Setup(x => x.UpdElement(It.IsAny<FlowerDataModel>()))
+            .Callback((FlowerDataModel x) =>
+            {
+                flag = x.Id == record.Id && x.Name == record.Name &&
+                x.Price == record.Price;
+            });
+        //Act
+        _productBusinessLogicContract.UpdateFlower(record);
+        //Assert
+        _productStorageContract.Verify(x => x.UpdElement(It.IsAny<FlowerDataModel>()), Times.Once);
+        Assert.That(flag);
+    }
+
+    [Test]
+    public void UpdateProduct_RecordWithIncorrectData_ThrowException_Test()
+    {
+        //Arrange
+        _productStorageContract.Setup(x => x.UpdElement(It.IsAny<FlowerDataModel>())).Throws(new ElementNotFoundException(""));
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.UpdateFlower(new(Guid.NewGuid().ToString(), "name", 10)), Throws.TypeOf<ElementNotFoundException>());
+        _productStorageContract.Verify(x => x.UpdElement(It.IsAny<FlowerDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void UpdateProduct_RecordWithExistsData_ThrowException_Test()
+    {
+        //Arrange
+        _productStorageContract.Setup(x => x.UpdElement(It.IsAny<FlowerDataModel>())).Throws(new ElementExistsException("Data", "Data"));
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.UpdateFlower(new(Guid.NewGuid().ToString(), "anme", 10)), Throws.TypeOf<ElementExistsException>());
+        _productStorageContract.Verify(x => x.UpdElement(It.IsAny<FlowerDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void UpdateProduct_NullRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.UpdateFlower(null), Throws.TypeOf<ArgumentNullException>());
+        _productStorageContract.Verify(x => x.UpdElement(It.IsAny<FlowerDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void UpdateProduct_InvalidRecord_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.UpdateFlower(new FlowerDataModel("id", "name", 10)), Throws.TypeOf<ValidationException>());
+        _productStorageContract.Verify(x => x.UpdElement(It.IsAny<FlowerDataModel>()), Times.Never);
+    }
+
+    [Test]
+    public void UpdateProduct_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _productStorageContract.Setup(x => x.UpdElement(It.IsAny<FlowerDataModel>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.UpdateFlower(new(Guid.NewGuid().ToString(), "name", 10)), Throws.TypeOf<StorageException>());
+        _productStorageContract.Verify(x => x.UpdElement(It.IsAny<FlowerDataModel>()), Times.Once);
+    }
+
+    [Test]
+    public void DeleteProduct_CorrectRecord_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        var flag = false;
+        _productStorageContract.Setup(x => x.DelElement(It.Is((string x) => x == id))).Callback(() => { flag = true; });
+        //Act
+        _productBusinessLogicContract.DeleteFlower(id);
+        //Assert
+        _productStorageContract.Verify(x => x.DelElement(It.IsAny<string>()), Times.Once);
+        Assert.That(flag);
+    }
+
+    [Test]
+    public void DeleteProduct_RecordWithIncorrectId_ThrowException_Test()
+    {
+        //Arrange
+        var id = Guid.NewGuid().ToString();
+        _productStorageContract.Setup(x => x.DelElement(It.IsAny<string>())).Throws(new ElementNotFoundException(id));
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.DeleteFlower(Guid.NewGuid().ToString()), Throws.TypeOf<ElementNotFoundException>());
+        _productStorageContract.Verify(x => x.DelElement(It.IsAny<string>()), Times.Once);
+    }
+
+    [Test]
+    public void DeleteProduct_IdIsNullOrEmpty_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.DeleteFlower(null), Throws.TypeOf<ArgumentNullException>());
+        Assert.That(() => _productBusinessLogicContract.DeleteFlower(string.Empty), Throws.TypeOf<ArgumentNullException>());
+        _productStorageContract.Verify(x => x.DelElement(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void DeleteProduct_IdIsNotGuid_ThrowException_Test()
+    {
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.DeleteFlower("id"), Throws.TypeOf<ValidationException>());
+        _productStorageContract.Verify(x => x.DelElement(It.IsAny<string>()), Times.Never);
+    }
+
+    [Test]
+    public void DeleteProduct_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _productStorageContract.Setup(x => x.DelElement(It.IsAny<string>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.DeleteFlower(Guid.NewGuid().ToString()), Throws.TypeOf<StorageException>());
+        _productStorageContract.Verify(x => x.DelElement(It.IsAny<string>()), Times.Once);
+    }
+}

DaisiesTests/DaisiesTests.csproj

@@ -10,7 +10,9 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="9.0.3" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0" />
+    <PackageReference Include="Moq" Version="4.20.72" />
     <PackageReference Include="NUnit" Version="3.13.3" />
     <PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
     <PackageReference Include="NUnit.Analyzers" Version="3.6.1" />
@@ -18,7 +20,9 @@
   </ItemGroup>
 
   <ItemGroup>
+    <ProjectReference Include="..\DaisiesBusinessLogic\DaisiesBusinessLogic.csproj" />
     <ProjectReference Include="..\DaisiesContracts\DaisiesContracts.csproj" />
+    <ProjectReference Include="..\DaisiesDatabase\DaisiesDatabase.csproj" />
   </ItemGroup>
 
 </Project>

DaisiesTests/DataModelTests/BouquetDataModelTests.cs

@@ -102,5 +102,5 @@ public class BouquetDataModelTests
         new BouquetDataModel(id, employeeId, customerId, name, compositionDate, type, items);
 
     private static List<BouquetItemDataModel> CreateItems() =>
-        new List<BouquetItemDataModel> { new BouquetItemDataModel(Guid.NewGuid().ToString(), 1) };
+        new List<BouquetItemDataModel> { new BouquetItemDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 1) };
 }

DaisiesTests/DataModelTests/BouquetItemDataModelTests.cs

@@ -6,14 +6,34 @@ namespace DaisiesTests.DataModelTests;
 [TestFixture]
 public class BouquetItemDataModelTests
 {
+    [Test]
+    public void Validate_ThrowsException_WhenBouquetIdIsNullOrEmpty()
+    {
+        Assert.Multiple(() =>
+        {
+            Assert.That(() => CreateDataModel(null, Guid.NewGuid().ToString(), 1).Validate(),
+                Throws.TypeOf<ValidationException>());
+            Assert.That(() => CreateDataModel(string.Empty, Guid.NewGuid().ToString(), 1).Validate(),
+                Throws.TypeOf<ValidationException>());
+        });
+    }
+
+    [Test]
+    public void Validate_ThrowsException_WhenBouquetIdIsNotGuid()
+    {
+        Assert.That(() => CreateDataModel("invalid-guid", Guid.NewGuid().ToString(), 1).Validate(),
+            Throws.TypeOf<ValidationException>());
+    }
+
+
     [Test]
     public void Validate_ThrowsException_WhenFlowerIdIsNullOrEmpty()
     {
         Assert.Multiple(() =>
         {
-            Assert.That(() => CreateDataModel(null, 1).Validate(),
+            Assert.That(() => CreateDataModel(Guid.NewGuid().ToString(), null, 1).Validate(),
                 Throws.TypeOf<ValidationException>());
-            Assert.That(() => CreateDataModel(string.Empty, 1).Validate(),
+            Assert.That(() => CreateDataModel(Guid.NewGuid().ToString(), string.Empty, 1).Validate(),
                 Throws.TypeOf<ValidationException>());
         });
     }
@@ -21,14 +41,15 @@ public class BouquetItemDataModelTests
     [Test]
     public void Validate_ThrowsException_WhenFlowerIdIsNotGuid()
     {
-        Assert.That(() => CreateDataModel("invalid-guid", 1).Validate(),
+
+        Assert.That(() => CreateDataModel(Guid.NewGuid().ToString(), "invalid-guid", 1).Validate(),
             Throws.TypeOf<ValidationException>());
     }
 
     [Test]
     public void Validate_ThrowsException_WhenQuantityIsNotPositive()
     {
-        Assert.That(() => CreateDataModel(Guid.NewGuid().ToString(), 0).Validate(),
+        Assert.That(() => CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 0).Validate(),
             Throws.TypeOf<ValidationException>());
     }
 
@@ -36,18 +57,20 @@ public class BouquetItemDataModelTests
     public void AllFieldsAreCorrectTest()
     {
         var flowerId = Guid.NewGuid().ToString();
+        var bouquetId = Guid.NewGuid().ToString();
         var quantity = 1;
 
-        var item = CreateDataModel(flowerId, quantity);
+        var item = CreateDataModel(bouquetId, flowerId, quantity);
 
         Assert.That(() => item.Validate(), Throws.Nothing);
         Assert.Multiple(() =>
         {
+            Assert.That(item.BouquetId, Is.EqualTo(bouquetId));
             Assert.That(item.FlowerId, Is.EqualTo(flowerId));
             Assert.That(item.Quantity, Is.EqualTo(quantity));
         });
     }
 
-    private static BouquetItemDataModel CreateDataModel(string flowerId, int quantity) =>
-        new BouquetItemDataModel(flowerId, quantity);
+    private static BouquetItemDataModel CreateDataModel(string bouquetId, string flowerId, int quantity) =>
+        new BouquetItemDataModel(bouquetId, flowerId, quantity);
 }

DaisiesTests/DataModelTests/CustomerDataModelTests.cs

@@ -79,5 +79,5 @@ public class CustomerDataModelTests
     }
 
     private static CustomerDataModel CreateDataModel(string id, string fullName, string phoneNumber, decimal discount, DateTime registrationDate) =>
-        new CustomerDataModel(id, fullName, phoneNumber, discount, registrationDate);
+        new CustomerDataModel(id, fullName, phoneNumber, registrationDate);
 }

DaisiesTests/DataModelTests/CustomerDiscountDataModelTests.cs

@@ -0,0 +1,57 @@
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+
+namespace DaisiesTests.DataModelTests;
+
+[TestFixture]
+public class CustomerDiscountDataModelTests
+{
+    [Test]
+    public void Validate_ThrowsException_WhenCustomerIdIsNullOrEmpty()
+    {
+        Assert.Multiple(() =>
+        {
+            Assert.That(() => CreateDataModel(null, DateTime.UtcNow, 20m).Validate(),
+                Throws.TypeOf<ValidationException>());
+            Assert.That(() => CreateDataModel(string.Empty, DateTime.UtcNow, 20m).Validate(),
+                Throws.TypeOf<ValidationException>());
+        });
+    }
+
+    [Test]
+    public void Validate_ThrowsException_WhenCustomerIdIsNotGuid()
+    {
+        Assert.That(() => CreateDataModel("invalid-guid", DateTime.UtcNow, 20m).Validate(),
+            Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void Validate_ThrowsException_WhenDiscountIsOutOfRange()
+    {
+        Assert.That(() => CreateDataModel(Guid.NewGuid().ToString(), DateTime.UtcNow, -1m).Validate(),
+            Throws.TypeOf<ValidationException>());
+        Assert.That(() => CreateDataModel(Guid.NewGuid().ToString(), DateTime.UtcNow, 101m).Validate(),
+            Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsAreCorrectTest()
+    {
+        var discountDateTime = DateTime.UtcNow;
+        var customerId = Guid.NewGuid().ToString();
+        var discount = 20m;
+
+        var customerDiscount = CreateDataModel(customerId, discountDateTime, discount);
+
+        Assert.That(() => customerDiscount.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(customerDiscount.DiscountDateTime, Is.EqualTo(discountDateTime));
+            Assert.That(customerDiscount.CustomerId, Is.EqualTo(customerId));
+            Assert.That(customerDiscount.Discount, Is.EqualTo(discount));
+        });
+    }
+
+    private static CustomerDiscountDataModel CreateDataModel(string customerId, DateTime dateTime, decimal discount) =>
+        new CustomerDiscountDataModel(customerId, dateTime, discount);
+}

DaisiesTests/Infrastructure/ConfigurationDatabaseTest.cs

@@ -0,0 +1,8 @@
+using DaisiesContracts.Infrastrcuture;
+
+namespace DaisiesTests.Infrastructure;
+
+internal class ConfigurationDatabaseTest : IConfigurationDatabase
+{
+    public string ConnectionString => "Host=localhost;Port=5432;Database=ee;Username=postgres;Password=123456789;";
+}

DaisiesTests/StorageContractsTests/BaseStorageContractTests.cs

@@ -0,0 +1,24 @@
+using DaisiesDatabase;
+using DaisiesTests.Infrastructure;
+
+namespace DaisiesTests.StorageContractsTests;
+
+internal class BaseStorageContractTests
+{
+    protected DaisiesDbContext DaisiesDbContext { get; private set; }
+
+    [OneTimeSetUp]
+    public void OneTimeSetUp()
+    {
+        DaisiesDbContext = new DaisiesDbContext(new ConfigurationDatabaseTest());
+        DaisiesDbContext.Database.EnsureDeleted();
+        DaisiesDbContext.Database.EnsureCreated();
+    }
+
+    [OneTimeTearDown]
+    public void OneTimeTearDown()
+    {
+        DaisiesDbContext.Database.EnsureDeleted();
+        DaisiesDbContext.Dispose();
+    }
+}

DaisiesTests/StorageContractsTests/BouquetStorageContractTests.cs

@@ -0,0 +1,291 @@
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesDatabase.Implementations;
+using DaisiesDatabase.Models;
+using DaisiesTests.StorageContractsTests;
+using Microsoft.EntityFrameworkCore;
+
+namespace DaisiesTests.StoragesContractsTests;
+
+internal class BouquetStorageContractTests : BaseStorageContractTests
+{
+    private BouquetStorageContract _orderStorageContract;
+    private Customer _customer;
+    private Employee _worker;
+    private Flower _product;
+    [SetUp]
+    public void SetUp()
+    {
+        _orderStorageContract = new BouquetStorageContract(DaisiesDbContext);
+        _worker = InsertWorkerToDatabaseAndReturn();
+        _product = InsertProductToDatabaseAndReturn();
+        _customer = InsertBuyerToDatabaseAndReturn();
+    }
+    [TearDown]
+    public void TearDown()
+    {
+        DaisiesDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Bouquets\" CASCADE; ");
+        DaisiesDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Employeers\" CASCADE; ");
+        DaisiesDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Flowers\" CASCADE; ");
+        DaisiesDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Customers\" CASCADE; ");
+    }
+
+    [Test]
+    public void Try_GetList_WhenHaveRecords_Test()
+    {
+        var Order = InsertOrderToDatabaseAndReturn(_worker.Id, _customer.Id, products: [(_product.Id, 1)]);
+        InsertOrderToDatabaseAndReturn(_worker.Id, _customer.Id, products: [(_product.Id, 5)]);
+        var list = _orderStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(2));
+        AssertElement(list.First(x => x.Id == Order.Id), Order);
+    }
+    [Test]
+    public void Try_GetList_WhenNoRecords_Test()
+    {
+        var list = _orderStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.Empty);
+    }
+    [Test]
+    public void Try_GetList_ByPeriod_Test()
+    {
+        InsertOrderToDatabaseAndReturn(_worker.Id, _customer.Id, OrderDate: DateTime.UtcNow.AddDays(-1).AddMinutes(-3), products: [(_product.Id, 1)]);
+        InsertOrderToDatabaseAndReturn(_worker.Id, _customer.Id, OrderDate: DateTime.UtcNow.AddDays(-1).AddMinutes(3), products: [(_product.Id, 1)]);
+        var list = _orderStorageContract.GetList(startDate: DateTime.UtcNow.AddDays(-1), endDate: DateTime.UtcNow.AddDays(1));
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(1));
+    }
+    [Test]
+    public void Try_GetList_ByWorkerId_Test()
+    {
+        var worker = InsertWorkerToDatabaseAndReturn("Other worker", "test4@gmail.com");
+        InsertOrderToDatabaseAndReturn(_worker.Id, _customer.Id, products: [(_product.Id, 1)]);
+        InsertOrderToDatabaseAndReturn(_worker.Id, _customer.Id, products: [(_product.Id, 1)]);
+        var list = _orderStorageContract.GetList(employeeId: _worker.Id);
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(2));
+        Assert.That(list.All(x => x.EmployeeId == _worker.Id));
+    }
+    [Test]
+    public void Try_GetList_ByProductId_Test()
+    {
+        var product = InsertProductToDatabaseAndReturn("Other name");
+        InsertOrderToDatabaseAndReturn(_worker.Id, _customer.Id, products: [(_product.Id, 5)]);
+        InsertOrderToDatabaseAndReturn(_worker.Id, _customer.Id, products: [(_product.Id, 1), (product.Id, 4)]);
+        var list = _orderStorageContract.GetList(flowerId: _product.Id);
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(2));
+        Assert.That(list.All(x => x.Items!.Any(y => y.FlowerId ==
+        _product.Id)));
+    }
+    [Test]
+    public void Try_GetList_ByAllParameters_Test()
+    {
+        var worker = InsertWorkerToDatabaseAndReturn("Other worker", "test2@gmail.com");
+        var buyer = InsertBuyerToDatabaseAndReturn("Other name1", "location");
+        var product = InsertProductToDatabaseAndReturn("Other name2");
+        InsertOrderToDatabaseAndReturn(_worker.Id, _customer.Id, OrderDate:
+        DateTime.UtcNow.AddDays(-1).AddMinutes(-3), products: [(_product.Id, 1)]);
+        InsertOrderToDatabaseAndReturn(worker.Id, _customer.Id, OrderDate:
+        DateTime.UtcNow.AddDays(-1).AddMinutes(3), products: [(_product.Id, 1)]);
+        InsertOrderToDatabaseAndReturn(worker.Id, _customer.Id, OrderDate:
+        DateTime.UtcNow.AddDays(-1).AddMinutes(3), products: [(product.Id, 1)]);
+        InsertOrderToDatabaseAndReturn(_worker.Id, buyer.Id, OrderDate:
+        DateTime.UtcNow.AddDays(1).AddMinutes(-3), products: [(_product.Id, 1)]);
+        InsertOrderToDatabaseAndReturn(_worker.Id, _customer.Id, OrderDate:
+        DateTime.UtcNow.AddDays(1).AddMinutes(-3), products: [(product.Id, 1)]);
+        var list = _orderStorageContract.GetList(startDate:
+        DateTime.UtcNow.AddDays(-1), endDate: DateTime.UtcNow.AddDays(1), employeeId: _worker.Id, flowerId: product.Id);
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(1));
+    }
+    [Test]
+    public void Try_GetElementById_WhenHaveRecord_Test()
+    {
+        var Order = InsertOrderToDatabaseAndReturn(_worker.Id, _customer.Id,
+        products: [(_product.Id, 1)]);
+        AssertElement(_orderStorageContract.GetElementById(Order.Id), Order);
+    }
+    [Test]
+    public void Try_GetElementById_WhenNoRecord_Test()
+    {
+        InsertOrderToDatabaseAndReturn(_worker.Id, _customer.Id, products: [(_product.Id, 1)]);
+        Assert.That(() =>
+        _orderStorageContract.GetElementById(Guid.NewGuid().ToString()), Is.Null);
+    }
+    [Test]
+    public void Try_GetElementById_WhenRecordHasCanceled_Test()
+    {
+        var Order = InsertOrderToDatabaseAndReturn(_worker.Id, _customer.Id, products: [(_product.Id, 1)], name: "fio fio");
+        AssertElement(_orderStorageContract.GetElementById(Order.Id), Order);
+    }
+    [Test]
+
+    public void Try_AddElement_Test()
+    {
+        var order = CreateModel(Guid.NewGuid().ToString(), _worker.Id, _customer.Id, "fio fio", [_product.Id]);
+        _orderStorageContract.AddElement(order);
+        AssertElement(GetOrderFromDatabaseById(order.Id), order);
+    }
+    [Test]
+    public void Try_AddElement_WhenIsDeletedIsTrue_Test()
+    {
+        var Order = CreateModel(Guid.NewGuid().ToString(), _worker.Id, _customer.Id, "fio fio", [_product.Id]);
+        Assert.That(() => _orderStorageContract.AddElement(Order), Throws.Nothing);
+        AssertElement(GetOrderFromDatabaseById(Order.Id), CreateModel(Order.Id, _worker.Id, _customer.Id, "fio fio", [_product.Id]));
+    }
+    [Test]
+    public void Try_DelElement_Test()
+    {
+        var Order = InsertOrderToDatabaseAndReturn(_worker.Id, _customer.Id,
+        products: [(_product.Id, 1)], name: "name fio");
+        _orderStorageContract.DelElement(Order.Id);
+        var element = GetOrderFromDatabaseById(Order.Id);
+        Assert.That(element, Is.Null);
+    }
+
+    [Test]
+    public void Try_DelElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _orderStorageContract.DelElement(Guid.NewGuid().ToString()), Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    private Customer InsertBuyerToDatabaseAndReturn(string name = "test", string phone = "+79876664455")
+    {
+        var customers = new Customer()
+        {
+            Id = Guid.NewGuid().ToString(),
+            FullName = name,
+            PhoneNumber = phone
+        };
+        DaisiesDbContext.Customers.Add(customers);
+        DaisiesDbContext.SaveChanges();
+        return customers;
+    }
+
+    private Employee InsertWorkerToDatabaseAndReturn(string fio = "test", string email = "test@gmail.com")
+    {
+        var worker = new Employee()
+        {
+            Id = Guid.NewGuid().ToString(),
+            FullName = fio,
+            Role = DaisiesContracts.Enums.EmployeeRole.Florist
+        };
+        DaisiesDbContext.Employeers.Add(worker);
+        DaisiesDbContext.SaveChanges();
+        return worker;
+    }
+
+    private Flower InsertProductToDatabaseAndReturn(string productName = "test", decimal price = 1)
+    {
+        var product = new Flower()
+        {
+            Id = Guid.NewGuid().ToString(),
+            Name = productName,
+            Price = price,
+        };
+        DaisiesDbContext.Flowers.Add(product);
+        DaisiesDbContext.SaveChanges();
+        return product;
+    }
+
+    private Bouquet InsertOrderToDatabaseAndReturn(string workerId, string customerId,
+        DateTime? OrderDate = null, string name = "fio",
+        List<(string, int)>? products = null)
+    {
+        var bouquet = new Bouquet()
+        {
+            EmployeeId = workerId,
+            CustomerId = customerId,
+            CompositionDate = OrderDate ?? DateTime.UtcNow,
+            Id = Guid.NewGuid().ToString(),
+            Name = name,
+            Items = []
+        };
+        if (products is not null)
+        {
+            foreach (var elem in products)
+            {
+                bouquet.Items.Add(new BouquetItem
+                {
+                    Id = Guid.NewGuid().ToString(),
+                    FlowerId = elem.Item1,
+                    BouquetId = bouquet.Id,
+                    Quantity = elem.Item2,
+                });
+            }
+        }
+        DaisiesDbContext.Bouquets.Add(bouquet);
+        DaisiesDbContext.SaveChanges();
+        return bouquet;
+    }
+    private static void AssertElement(BouquetDataModel? actual, Bouquet expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.EmployeeId, Is.EqualTo(expected.EmployeeId));
+            Assert.That(actual.CustomerId, Is.EqualTo(expected.CustomerId));
+            Assert.That(actual.Name, Is.EqualTo(expected.Name));
+        });
+        if (expected.Items is not null)
+        {
+            Assert.That(actual.Items, Is.Not.Null); Assert.That(actual.Items,
+Has.Count.EqualTo(expected.Items.Count));
+            for (int i = 0; i < actual.Items.Count; ++i)
+            {
+                Assert.Multiple(() =>
+                {
+                    Assert.That(actual.Items[i].FlowerId,
+                    Is.EqualTo(expected.Items[i].FlowerId));
+                    Assert.That(actual.Items[i].Quantity,
+                    Is.EqualTo(expected.Items[i].Quantity));
+                });
+            }
+        }
+        else
+        {
+            Assert.That(actual.Items, Is.Null);
+        }
+    }
+    private static BouquetDataModel CreateModel(string id, string workerId, string? customerId, string name, List<string> productIds)
+    {
+        var products = productIds.Select(x => new BouquetItemDataModel(id, x, 1)).ToList();
+        return new(id, workerId, customerId, name, DateTime.UtcNow, DaisiesContracts.Enums.BouquetType.Standard, products);
+    }
+
+    private Bouquet? GetOrderFromDatabaseById(string id) => DaisiesDbContext.Bouquets.Include(x => x.Items).FirstOrDefault(x => x.Id == id);
+
+    private static void AssertElement(Bouquet? actual, BouquetDataModel expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.EmployeeId, Is.EqualTo(expected.EmployeeId));
+            Assert.That(actual.CustomerId, Is.EqualTo(expected.CustomerId));
+            Assert.That(actual.Name, Is.EqualTo(expected.Name));
+        });
+        if (expected.Items is not null)
+        {
+            Assert.That(actual.Items, Is.Not.Null);
+            Assert.That(actual.Items, Has.Count.EqualTo(expected.Items.Count));
+            for (int i = 0; i < actual.Items.Count; ++i)
+            {
+                Assert.Multiple(() =>
+                {
+                    Assert.That(actual.Items[i].FlowerId,
+                    Is.EqualTo(expected.Items[i].FlowerId));
+                    Assert.That(actual.Items[i].Quantity,
+                    Is.EqualTo(expected.Items[i].Quantity));
+                });
+            }
+        }
+        else
+        {
+            Assert.That(actual.Items, Is.Null);
+        }
+    }
+}

DaisiesTests/StorageContractsTests/CustomerDiscountStorageContractTests.cs

@@ -0,0 +1,153 @@
+using DaisiesContracts.DataModels;
+using DaisiesDatabase.Implementations;
+using DaisiesDatabase.Models;
+using DaisiesTests.StorageContractsTests;
+using Microsoft.EntityFrameworkCore;
+using CustomerDiscount = DaisiesDatabase.Models.CustomerDiscount;
+
+namespace DaisiesTests.StoragesContractsTests;
+
+internal class CustomerDiscountStorageContractTests : BaseStorageContractTests
+{
+    private CustomerDiscountStorageContract _salaryStorageContract;
+    private Customer _worker;
+
+    [SetUp]
+    public void SetUp()
+    {
+        _salaryStorageContract = new CustomerDiscountStorageContract(DaisiesDbContext);
+        _worker = InsertWorkerToDatabaseAndReturn();
+    }
+    [TearDown]
+    public void TearDown()
+    {
+        DaisiesDbContext.Database.ExecuteSqlRaw("TRUNCATE \"CustomerDiscounts\" CASCADE; ");
+        DaisiesDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Customers\" CASCADE; ");
+    }
+
+    [Test]
+    public void Try_GetList_WhenHaveRecords_Test()
+    {
+        var salary = InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id, workerSalary: 100);
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id);
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id);
+        var list = _salaryStorageContract.GetList(DateTime.UtcNow.AddDays(-10), DateTime.UtcNow.AddDays(10));
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(3));
+        AssertElement(list.First(), salary);
+    }
+    [Test]
+    public void Try_GetList_WhenNoRecords_Test()
+    {
+        var list = _salaryStorageContract.GetList(DateTime.UtcNow.AddDays(-10), DateTime.UtcNow.AddDays(10));
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.Empty);
+    }
+    [Test]
+    public void Try_GetList_OnlyInDatePeriod_Test()
+    {
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id, salaryDate: DateTime.UtcNow.AddDays(-2));
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id, salaryDate: DateTime.UtcNow.AddDays(-1).AddMinutes(-5));
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id, salaryDate: DateTime.UtcNow.AddDays(-1).AddMinutes(5));
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id, salaryDate: DateTime.UtcNow.AddDays(1).AddMinutes(-5));
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id, salaryDate: DateTime.UtcNow.AddDays(1).AddMinutes(5));
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id, salaryDate: DateTime.UtcNow.AddDays(-2));
+        var list = _salaryStorageContract.GetList(DateTime.UtcNow.AddDays(-1), DateTime.UtcNow.AddDays(1));
+        Assert.That(list, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(list, Has.Count.EqualTo(2));
+        });
+    }
+    [Test]
+    public void Try_GetList_ByWorker_Test()
+    {
+        var worker = InsertWorkerToDatabaseAndReturn("name 2", "79996547878");
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id);
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id);
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), worker.Id);
+        var list = _salaryStorageContract.GetList(DateTime.UtcNow.AddDays(-1), DateTime.UtcNow.AddDays(1), _worker.Id);
+        Assert.That(list, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(list, Has.Count.EqualTo(2));
+            Assert.That(list.All(x => x.CustomerId == _worker.Id));
+        });
+    }
+    [Test]
+    public void Try_GetList_ByWorkerOnlyInDatePeriod_Test()
+    {
+        var worker = InsertWorkerToDatabaseAndReturn("name 2", "79996547878");
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id, salaryDate: DateTime.UtcNow.AddDays(-2));
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id, salaryDate: DateTime.UtcNow.AddDays(-1).AddMinutes(5));
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), worker.Id, salaryDate: DateTime.UtcNow.AddDays(-1).AddMinutes(5));
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id, salaryDate: DateTime.UtcNow.AddDays(1).AddMinutes(-5));
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), worker.Id, salaryDate: DateTime.UtcNow.AddDays(1).AddMinutes(-5));
+        InsertSalaryToDatabaseAndReturn(Guid.NewGuid().ToString(), _worker.Id, salaryDate: DateTime.UtcNow.AddDays(-2));
+        var list = _salaryStorageContract.GetList(DateTime.UtcNow.AddDays(-1), DateTime.UtcNow.AddDays(1), _worker.Id);
+        Assert.That(list, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(list, Has.Count.EqualTo(2));
+            Assert.That(list.All(x => x.CustomerId == _worker.Id));
+        });
+    }
+    [Test]
+    public void Try_AddElement_Test()
+    {
+        var salary = CreateModel(_worker.Id);
+        _salaryStorageContract.AddElement(salary);
+        AssertElement(GetSalaryFromDatabaseByCustomerId(_worker.Id), salary);
+    }
+
+    private Customer InsertWorkerToDatabaseAndReturn(string workerFIO = "fio", string phoneNumber = "+76549999999")
+    {
+        var worker = new Customer()
+        {
+            Id = Guid.NewGuid().ToString(),
+            PhoneNumber = phoneNumber,
+            FullName = workerFIO,
+        };
+        DaisiesDbContext.Customers.Add(worker);
+        DaisiesDbContext.SaveChanges();
+        return worker;
+    }
+
+    private CustomerDiscount InsertSalaryToDatabaseAndReturn(string id, string workerId, decimal workerSalary = 1, DateTime? salaryDate = null)
+    {
+        var salary = new CustomerDiscount()
+        {
+            Id = id,
+            CustomerId = workerId,
+            Discount = workerSalary,
+            DiscountDateTime = salaryDate ?? DateTime.UtcNow
+        };
+        DaisiesDbContext.CustomerDiscounts.Add(salary);
+        DaisiesDbContext.SaveChanges();
+        return salary;
+    }
+
+    private static void AssertElement(CustomerDiscountDataModel? actual, CustomerDiscount expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.CustomerId, Is.EqualTo(expected.CustomerId));
+            Assert.That(actual.Discount, Is.EqualTo(expected.Discount));
+        });
+    }
+
+    private static CustomerDiscountDataModel CreateModel(string customerId, decimal discountSize = 1, DateTime? salaryDate = null) => new(customerId, salaryDate ?? DateTime.UtcNow, discountSize);
+
+    private CustomerDiscount? GetSalaryFromDatabaseByCustomerId(string id) => DaisiesDbContext.CustomerDiscounts.FirstOrDefault(x => x.CustomerId == id);
+
+    private static void AssertElement(CustomerDiscount? actual, CustomerDiscountDataModel expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.CustomerId, Is.EqualTo(expected.CustomerId));
+            Assert.That(actual.Discount, Is.EqualTo(expected.Discount));
+        });
+    }
+}

DaisiesTests/StorageContractsTests/CustomerStorageContractTests.cs

@@ -0,0 +1,224 @@
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesDatabase;
+using DaisiesDatabase.Implementations;
+using DaisiesDatabase.Models;
+using DaisiesTests.StorageContractsTests;
+using Microsoft.EntityFrameworkCore;
+using System;
+
+namespace DaisiesTests.StoragesContractsTests;
+
+internal class CustomerStorageContractTests : BaseStorageContractTests
+{
+    private CustomerStorageContract _buyerStorageContract;
+
+    [SetUp]
+    public void SetUp()
+    {
+        _buyerStorageContract = new CustomerStorageContract(DaisiesDbContext);
+    }
+
+    [TearDown]
+    public void TearDown()
+    {
+        DaisiesDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Customers\" CASCADE; ");
+    }
+
+
+    [Test]
+    public void Try_GetList_WhenHaveRecords_Test()
+    {
+        var buyer = InsertBuyerToDatabaseAndReturn(Guid.NewGuid().ToString(), phoneNumber: "+5-555-555-55-45");
+        InsertBuyerToDatabaseAndReturn(Guid.NewGuid().ToString(), phoneNumber: "+6-666-666-66-46");
+        InsertBuyerToDatabaseAndReturn(Guid.NewGuid().ToString(), phoneNumber: "+7-777-777-77-47");
+        var list = _buyerStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(3));
+        AssertElement(list.First(x => x.Id == buyer.Id), buyer);
+    }
+
+    [Test]
+    public void Try_GetList_WhenNoRecords_Test()
+    {
+        var list = _buyerStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.Empty);
+    }
+    [Test]
+    public void Try_GetElementById_WhenHaveRecord_Test()
+    {
+        var buyer = InsertBuyerToDatabaseAndReturn(Guid.NewGuid().ToString(), "New Fio", "+5-666-555-88-99");
+        AssertElement(_buyerStorageContract.GetElementById(buyer.Id), buyer);
+    }
+    [Test]
+    public void Try_GetElementById_WhenNoRecord_Test()
+    {
+        InsertBuyerToDatabaseAndReturn(Guid.NewGuid().ToString(), "New Fio", "+5-666-645-55-56");
+        Assert.That(() => _buyerStorageContract.GetElementById(Guid.NewGuid().ToString()), Is.Null);
+    }
+    [Test]
+    public void Try_GetElementByFIO_WhenHaveRecord_Test()
+    {
+        var buyer = InsertBuyerToDatabaseAndReturn(Guid.NewGuid().ToString(), "New Fio4444", "+5-987-555-55-56");
+        AssertElement(_buyerStorageContract.GetElementByFullName(buyer.FullName), buyer);
+    }
+    [Test]
+    public void Try_GetElementByFIO_WhenNoRecord_Test()
+    {
+        InsertBuyerToDatabaseAndReturn(Guid.NewGuid().ToString(), "New Fio32132", "+5-635-555-55-56");
+        Assert.That(() => _buyerStorageContract.GetElementByFullName("New Fio222222222222"), Is.Null);
+    }
+    [Test]
+    public void Try_GetElementByPhoneNumber_WhenHaveRecord_Test()
+    {
+        var buyer =
+        InsertBuyerToDatabaseAndReturn(Guid.NewGuid().ToString(), "New Fio", "+5-126-555-55-56");
+        AssertElement(_buyerStorageContract.GetElementByPhoneNumber(buyer.PhoneNumber), buyer);
+    }
+    [Test]
+    public void Try_GetElementByPhoneNumber_WhenNoRecord_Test()
+    {
+        InsertBuyerToDatabaseAndReturn(Guid.NewGuid().ToString(), "New Fio", "+5-664-555-55-56");
+        Assert.That(() => _buyerStorageContract.GetElementByPhoneNumber("+8- 888 - 888 - 78 - 88"), Is.Null);
+    }
+    [Test]
+    public void Try_AddElement_Test()
+    {
+        var buyer = CreateModel(Guid.NewGuid().ToString());
+        _buyerStorageContract.AddElement(buyer);
+        AssertElement(GetBuyerFromDatabase(buyer.Id), buyer);
+    }
+    [Test]
+    public void Try_AddElement_WhenHaveRecordWithSameId_Test()
+    {
+        var buyer = CreateModel(Guid.NewGuid().ToString(), "New Fio", "+5-555-555-55-56");
+        InsertBuyerToDatabaseAndReturn(buyer.Id, "New Fio", "+5-666-555-55-56");
+        Assert.That(() => _buyerStorageContract.AddElement(buyer),
+        Throws.TypeOf<ElementExistsException>());
+    }
+    [Test]
+    public void Try_AddElement_WhenHaveRecordWithSamePhoneNumber_Test()
+    {
+        var buyer = CreateModel(Guid.NewGuid().ToString(), "New Fio", "+5-321-555-55-58");
+        InsertBuyerToDatabaseAndReturn(Guid.NewGuid().ToString(), phoneNumber: buyer.PhoneNumber);
+        Assert.That(() => _buyerStorageContract.AddElement(buyer), Throws.TypeOf<ElementExistsException>());
+    }
+
+    [Test]
+    public void Try_UpdElement_Test()
+    {
+        var buyer = CreateModel(Guid.NewGuid().ToString(), "New Fio", "+5-555-555-55-55");
+        InsertBuyerToDatabaseAndReturn(buyer.Id, "New Fio", phoneNumber: "+7-147-777-77-77");
+        _buyerStorageContract.UpdElement(buyer);
+        AssertElement(GetBuyerFromDatabase(buyer.Id), buyer);
+    }
+    [Test]
+    public void Try_UpdElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _buyerStorageContract.UpdElement(CreateModel(Guid.NewGuid().ToString())), Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    [Test]
+    public void Try_UpdElement_WhenHaveRecordWithSamePhoneNumber_Test()
+    {
+        var buyer = CreateModel(Guid.NewGuid().ToString(), "New Fio", "+5-321-555-55-55");
+        InsertBuyerToDatabaseAndReturn(buyer.Id, phoneNumber: "+7-111-777-77-77");
+        InsertBuyerToDatabaseAndReturn(Guid.NewGuid().ToString(), phoneNumber: buyer.PhoneNumber);
+        Assert.That(() => _buyerStorageContract.UpdElement(buyer), Throws.TypeOf<StorageException>());
+    }
+
+    [Test]
+    public void Try_DelElement_Test()
+    {
+        var buyer =
+        InsertBuyerToDatabaseAndReturn(Guid.NewGuid().ToString(), phoneNumber: "+7-777-332-77-77");
+        _buyerStorageContract.DelElement(buyer.Id);
+        var element = GetBuyerFromDatabase(buyer.Id);
+        Assert.That(element, Is.Null);
+    }
+    [Test]
+    public void Try_DelElement_WhenHaveOrdersByThisBuyer_Test()
+    {
+        var buyer = InsertBuyerToDatabaseAndReturn(Guid.NewGuid().ToString(), phoneNumber: "+7-777-777-01-77");
+        var workerId = Guid.NewGuid().ToString();
+        DaisiesDbContext.Employeers.Add(new Employee()
+        {
+            Id = workerId,
+            FullName = "test",
+            Role = DaisiesContracts.Enums.EmployeeRole.Administrator,
+            IsActive = true, 
+            EmploymentDate = DateTime.UtcNow.AddDays(-1)
+        });
+        DaisiesDbContext.Bouquets.Add(new Bouquet()
+        {
+            Id = Guid.NewGuid().ToString(),
+            EmployeeId = workerId,
+            CustomerId = buyer.Id,
+            Name = "name"
+        });
+        DaisiesDbContext.Bouquets.Add(new Bouquet()
+        {
+            Id = Guid.NewGuid().ToString(),
+            EmployeeId = workerId,
+            CustomerId = buyer.Id,
+            Name = "name"
+        });
+        DaisiesDbContext.SaveChanges();
+        var OrdersBeforeDelete = DaisiesDbContext.Bouquets.Where(x => x.CustomerId == buyer.Id).ToArray();
+        _buyerStorageContract.DelElement(buyer.Id);
+        var element = GetBuyerFromDatabase(buyer.Id);
+        var OrdersAfterDelete = DaisiesDbContext.Bouquets.Where(x => x.CustomerId == buyer.Id).ToArray();
+        Assert.Multiple(() =>
+        {
+            Assert.That(element, Is.Null);
+            Assert.That(OrdersBeforeDelete, Has.Length.EqualTo(2));
+            Assert.That(OrdersAfterDelete, Is.Empty);
+            Assert.That(DaisiesDbContext.Bouquets.Count(), Is.EqualTo(0));
+        });
+    }
+
+    [Test]
+    public void Try_DelElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _buyerStorageContract.DelElement(Guid.NewGuid().ToString()),
+        Throws.TypeOf<ElementNotFoundException>());
+    }
+    private Customer InsertBuyerToDatabaseAndReturn(string id, string fio = "test", string phoneNumber = "+7-777-777-77-77")
+    {
+        var buyer = new Customer()
+        {
+            Id = id,
+            FullName = fio,
+            PhoneNumber = phoneNumber,
+            RegistrationDate = DateTime.UtcNow,
+        };
+        DaisiesDbContext.Customers.Add(buyer);
+        DaisiesDbContext.SaveChanges();
+        return buyer;
+    }
+    private static void AssertElement(CustomerDataModel? actual, Customer expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.FullName, Is.EqualTo(expected.FullName));
+            Assert.That(actual.PhoneNumber, Is.EqualTo(expected.PhoneNumber));
+        });
+    }
+    private static CustomerDataModel CreateModel(string id, string fio = "test", string phoneNumber = "+7-777-777-77-77") => new(id, fio, phoneNumber, DateTime.UtcNow);
+
+    private Customer? GetBuyerFromDatabase(string id) => DaisiesDbContext.Customers.FirstOrDefault(x => x.Id == id);
+
+    private static void AssertElement(Customer? actual, CustomerDataModel expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.FullName, Is.EqualTo(expected.FullName));
+            Assert.That(actual.PhoneNumber, Is.EqualTo(expected.PhoneNumber));
+        });
+    }
+}

DaisiesTests/StorageContractsTests/EmployeeStorageContractTests.cs

@@ -0,0 +1,169 @@
+using Microsoft.EntityFrameworkCore;
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesDatabase.Implementations;
+using DaisiesDatabase.Models;
+using DaisiesTests.StorageContractsTests;
+using DaisiesContracts.Enums;
+
+namespace DaisiesTests.StoragesContractsTests;
+
+[TestFixture]
+internal class EmployeeStorageContractTests : BaseStorageContractTests
+{
+    private EmployeeStorageContract _workerStorageContract;
+
+    [SetUp]
+    public void SetUp()
+    {
+        _workerStorageContract = new EmployeeStorageContract(DaisiesDbContext);
+    }
+
+    [TearDown]
+    public void TearDown()
+    {
+        DaisiesDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Employeers\" CASCADE; ");
+    }
+
+    [Test]
+    public void Try_GetList_WhenHaveRecords_Test()
+    {
+        var worker = InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 1");
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 2");
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 3");
+        var list = _workerStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(3));
+        AssertElement(list.First(), worker);
+    }
+    [Test]
+    public void Try_GetList_WhenNoRecords_Test()
+    {
+        var list = _workerStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.Empty);
+    }
+
+    [Test]
+    public void Try_GetList_ByEmploymentDate_Test()
+    {
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 1", employmentDate: DateTime.UtcNow.AddDays(-2));
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 2", employmentDate: DateTime.UtcNow.AddDays(-1));
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 3", employmentDate: DateTime.UtcNow.AddDays(1));
+        InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString(), "fio 4", employmentDate: DateTime.UtcNow.AddDays(2));
+        var list = _workerStorageContract.GetList(fromEmploymentDate: DateTime.UtcNow.AddDays(-1).AddMinutes(-1), toEmploymentDate: DateTime.UtcNow.AddDays(1).AddMinutes(1));
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(2));
+    }
+    [Test]
+    public void Try_GetElementById_WhenHaveRecord_Test()
+    {
+        var worker = InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString());
+        AssertElement(_workerStorageContract.GetElementById(worker.Id), worker);
+    }
+    [Test]
+    public void Try_GetElementById_WhenNoRecord_Test()
+    {
+        Assert.That(() => _workerStorageContract.GetElementById(Guid.NewGuid().ToString()), Is.Null);
+    }
+    [Test]
+    public void Try_AddElement_Test()
+    {
+        var worker = CreateModel(Guid.NewGuid().ToString());
+        _workerStorageContract.AddElement(worker);
+        AssertElement(GetWorkerFromDatabase(worker.Id), worker);
+    }
+    [Test]
+    public void Try_AddElement_WhenHaveRecordWithSameId_Test()
+    {
+        var worker = CreateModel(Guid.NewGuid().ToString());
+        InsertWorkerToDatabaseAndReturn(worker.Id);
+        Assert.That(() => _workerStorageContract.AddElement(worker), Throws.TypeOf<ElementExistsException>());
+    }
+    [Test]
+    public void Try_UpdElement_Test()
+    {
+        var worker = CreateModel(Guid.NewGuid().ToString(), "New Fio");
+        InsertWorkerToDatabaseAndReturn(worker.Id);
+        _workerStorageContract.UpdElement(worker);
+        AssertElement(GetWorkerFromDatabase(worker.Id), worker);
+    }
+    [Test]
+    public void Try_UpdElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _workerStorageContract.UpdElement(CreateModel(Guid.NewGuid().ToString())), Throws.TypeOf<ElementNotFoundException>());
+    }
+    [Test]
+    public void Try_UpdElement_WhenNoRecordWasDeleted_Test()
+    {
+        var worker = CreateModel(Guid.NewGuid().ToString());
+        InsertWorkerToDatabaseAndReturn(worker.Id, isActive: false);
+        Assert.That(() => _workerStorageContract.UpdElement(worker), Throws.TypeOf<ElementNotFoundException>());
+    }
+    [Test]
+    public void Try_DelElement_Test()
+    {
+        var worker = InsertWorkerToDatabaseAndReturn(Guid.NewGuid().ToString());
+        _workerStorageContract.DelElement(worker.Id);
+        var element = GetWorkerFromDatabase(worker.Id);
+        Assert.That(element, Is.Not.Null);
+        Assert.That(!element.IsActive);
+    }
+    [Test]
+    public void Try_DelElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _workerStorageContract.DelElement(Guid.NewGuid().ToString()), Throws.TypeOf<ElementNotFoundException>());
+    }
+    [Test]
+    public void Try_DelElement_WhenNoRecordWasDeleted_Test()
+    {
+        var worker = CreateModel(Guid.NewGuid().ToString());
+        InsertWorkerToDatabaseAndReturn(worker.Id, isActive: false);
+        Assert.That(() => _workerStorageContract.DelElement(worker.Id), Throws.TypeOf<ElementNotFoundException>());
+    }
+    private Employee InsertWorkerToDatabaseAndReturn(string id, string fio = "test", EmployeeRole role = EmployeeRole.Helper,
+        DateTime? employmentDate = null, bool isActive = true)
+    {
+        var worker = new Employee()
+        {
+            Id = id,
+            FullName = fio,
+            Role = role,
+            EmploymentDate = employmentDate ?? DateTime.UtcNow,
+            IsActive = isActive
+        };
+        DaisiesDbContext.Employeers.Add(worker);
+        DaisiesDbContext.SaveChanges();
+        return worker;
+    }
+    private static void AssertElement(EmployeeDataModel? actual, Employee expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.FullName, Is.EqualTo(expected.FullName));
+            Assert.That(actual.Role, Is.EqualTo(expected.Role));
+            Assert.That(actual.EmploymentDate, Is.EqualTo(expected.EmploymentDate));
+            Assert.That(actual.IsActive, Is.EqualTo(expected.IsActive));
+        });
+    }
+
+    private static EmployeeDataModel CreateModel(string id, string fio = "fio", EmployeeRole role = EmployeeRole.Helper,
+        DateTime? employmentDate = null, bool isActive = true) =>
+    new(id, fio, role, employmentDate ?? DateTime.UtcNow, isActive);
+    
+    private Employee? GetWorkerFromDatabase(string id) => DaisiesDbContext.Employeers.FirstOrDefault(x => x.Id == id);
+
+    private static void AssertElement(Employee? actual, EmployeeDataModel expected)
+    {
+        Assert.That(actual, Is.Not.Null); Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.FullName, Is.EqualTo(expected.FullName));
+            Assert.That(actual.Role, Is.EqualTo(expected.Role));
+            Assert.That(actual.EmploymentDate, Is.EqualTo(expected.EmploymentDate));
+            Assert.That(actual.IsActive, Is.EqualTo(expected.IsActive));
+        });
+    }
+}

DaisiesTests/StorageContractsTests/FlowerStorageContractTests.cs

@@ -0,0 +1,169 @@
+using DaisiesContracts.DataModels;
+using DaisiesContracts.Exceptions;
+using DaisiesDatabase.Implementations;
+using DaisiesDatabase.Models;
+using DaisiesTests.StorageContractsTests;
+using Microsoft.EntityFrameworkCore;
+
+namespace DaisiesTests.StoragesContractsTests;
+
+[TestFixture]
+internal class FlowerStorageContractTests : BaseStorageContractTests
+{
+    private FlowerStorageContract _productStorageContract;
+
+    [SetUp]
+    public void SetUp()
+    {
+        _productStorageContract = new FlowerStorageContract(DaisiesDbContext);
+    }
+    [TearDown]
+    public void TearDown()
+    {
+        DaisiesDbContext.Database.ExecuteSqlRaw("TRUNCATE \"Flowers\" CASCADE; ");
+    }
+
+    [Test]
+    public void Try_GetList_WhenHaveRecords_Test()
+    {
+        var product =
+        InsertProductToDatabaseAndReturn(Guid.NewGuid().ToString(), "name 1");
+        InsertProductToDatabaseAndReturn(Guid.NewGuid().ToString(), "name 2");
+        InsertProductToDatabaseAndReturn(Guid.NewGuid().ToString(), "name 3");
+        var list = _productStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Has.Count.EqualTo(3));
+        AssertElement(list.First(x => x.Id == product.Id), product);
+    }
+    [Test]
+    public void Try_GetList_WhenNoRecords_Test()
+    {
+        var list = _productStorageContract.GetList();
+        Assert.That(list, Is.Not.Null);
+        Assert.That(list, Is.Empty);
+    }
+
+    [Test]
+    public void Try_GetElementById_WhenHaveRecord_Test()
+    {
+        var product = InsertProductToDatabaseAndReturn(Guid.NewGuid().ToString());
+        AssertElement(_productStorageContract.GetElementById(product.Id), product);
+    }
+
+    [Test]
+    public void Try_GetElementById_WhenNoRecord_Test()
+    {
+        InsertProductToDatabaseAndReturn(Guid.NewGuid().ToString());
+        Assert.That(() => _productStorageContract.GetElementById(Guid.NewGuid().ToString()), Is.Null);
+    }
+    [Test]
+    public void Try_GetElementByName_WhenHaveRecord_Test()
+    {
+        var product =
+        InsertProductToDatabaseAndReturn(Guid.NewGuid().ToString());
+        AssertElement(_productStorageContract.GetElementByName(product.Name), product);
+    }
+    [Test]
+    public void Try_GetElementByName_WhenNoRecord_Test()
+    {
+        InsertProductToDatabaseAndReturn(Guid.NewGuid().ToString());
+        Assert.That(() => _productStorageContract.GetElementByName("name"), Is.Null);
+    }
+    [Test]
+    public void Try_AddElement_Test()
+    {
+        var product = CreateModel(Guid.NewGuid().ToString());
+        _productStorageContract.AddElement(product);
+        AssertElement(GetProductFromDatabaseById(product.Id), product);
+    }
+    [Test]
+    public void Try_AddElement_WhenHaveRecordWithSameId_Test()
+    {
+        var product = CreateModel(Guid.NewGuid().ToString());
+        InsertProductToDatabaseAndReturn(product.Id, productName: "name unique");
+        Assert.That(() => _productStorageContract.AddElement(product), Throws.TypeOf<ElementExistsException>());
+    }
+    [Test]
+    public void Try_AddElement_WhenHaveRecordWithSameName_Test()
+    {
+        var product = CreateModel(Guid.NewGuid().ToString(), "name unique");
+        InsertProductToDatabaseAndReturn(Guid.NewGuid().ToString(), productName: product.Name);
+        Assert.That(() => _productStorageContract.AddElement(product), Throws.TypeOf<ElementExistsException>());
+    }
+    [Test]
+    public void Try_UpdElement_Test()
+    {
+        var product = CreateModel(Guid.NewGuid().ToString());
+        InsertProductToDatabaseAndReturn(product.Id);
+        _productStorageContract.UpdElement(product);
+        AssertElement(GetProductFromDatabaseById(product.Id), product);
+    }
+    [Test]
+    public void Try_UpdElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _productStorageContract.UpdElement(CreateModel(Guid.NewGuid().ToString())), Throws.TypeOf<ElementNotFoundException>());
+    }
+    [Test]
+    public void Try_UpdElement_WhenHaveRecordWithSameName_Test()
+    {
+        var product = CreateModel(Guid.NewGuid().ToString(), "name unique");
+        InsertProductToDatabaseAndReturn(product.Id, productName: "name");
+        InsertProductToDatabaseAndReturn(Guid.NewGuid().ToString(), productName: product.Name);
+        Assert.That(() => _productStorageContract.UpdElement(product),
+        Throws.TypeOf<ElementExistsException>());
+    }
+    [Test]
+    public void Try_DelElement_Test()
+    {
+        var product = InsertProductToDatabaseAndReturn(Guid.NewGuid().ToString());
+        _productStorageContract.DelElement(product.Id);
+        var element = GetProductFromDatabaseById(product.Id);
+        Assert.That(element, Is.Null);
+    }
+
+    [Test]
+    public void Try_DelElement_WhenNoRecordWithThisId_Test()
+    {
+        Assert.That(() => _productStorageContract.DelElement(Guid.NewGuid().ToString()), Throws.TypeOf<ElementNotFoundException>());
+    }
+
+    private Flower InsertProductToDatabaseAndReturn(string id, string productName = "test", decimal price = 1)
+    {
+        var product = new Flower()
+        {
+            Id = id,
+            Name = productName,
+            Price = price,
+        };
+        DaisiesDbContext.Flowers.Add(product);
+        DaisiesDbContext.SaveChanges();
+        return product;
+    }
+
+    private static void AssertElement(FlowerDataModel? actual, Flower expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.Name, Is.EqualTo(expected.Name));
+            Assert.That(actual.Price, Is.EqualTo(expected.Price));
+        });
+    }
+
+    private static FlowerDataModel CreateModel(string id, string productName = "test", decimal price = 1)
+    => new(id, productName, price);
+
+    private Flower? GetProductFromDatabaseById(string id) => DaisiesDbContext.Flowers.FirstOrDefault(x => x.Id == id);
+
+    private static void AssertElement(Flower? actual, FlowerDataModel expected)
+    {
+        Assert.That(actual, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(actual.Id, Is.EqualTo(expected.Id));
+            Assert.That(actual.Name, Is.EqualTo(expected.Name));
+            Assert.That(actual.Price, Is.EqualTo(expected.Price));
+        });
+    }
+}