lab 2 work

2025-03-18 20:05:36 +04:00
34 changed files with 2636 additions and 10 deletions
--- a/DaisiesBusinessLogic/DaisiesBusinessLogic.csproj
+++ b/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>
--- a/DaisiesBusinessLogic/Implementations/BouquetBusinessLogicContract.cs
+++ b/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);
+    }
+}
--- a/DaisiesBusinessLogic/Implementations/CustomerBusinessLogicContract.cs
+++ b/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);
+    }
+}
--- a/DaisiesBusinessLogic/Implementations/CustomerDiscountBusinessLogicContract.cs
+++ b/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();
+    }
+}
--- a/DaisiesBusinessLogic/Implementations/EmployeeBusinessLogicContract.cs
+++ b/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);
+    }
+}
--- a/DaisiesBusinessLogic/Implementations/FlowerBusinessLogicContract.cs
+++ b/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(onlyActive) ?? 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);
+    }
+}
--- a/DaisiesContracts/BusinessLogicsContracts/IBouquetBusinessLogicContract.cs
+++ b/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);
+}
--- a/DaisiesContracts/BusinessLogicsContracts/ICustomerBusinessLogicContract.cs
+++ b/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);
+}
--- a/DaisiesContracts/BusinessLogicsContracts/ICustomerDiscountBusinessLogicContract.cs
+++ b/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);
+}
--- a/DaisiesContracts/BusinessLogicsContracts/IEmployeeBusinessLogicContract.cs
+++ b/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);
+}
--- a/DaisiesContracts/BusinessLogicsContracts/IFlowerBusinessLogicContract.cs
+++ b/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);
+}
--- a/DaisiesContracts/DataModels/BouquetItemDataModel.cs
+++ b/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())
--- a/DaisiesContracts/DataModels/CustomerDiscountDataModel.cs
+++ b/DaisiesContracts/DataModels/CustomerDiscountDataModel.cs
@@ -0,0 +1,25 @@
+using DaisiesContracts.Exceptions;
+using DaisiesContracts.Extensions;
+using DaisiesContracts.Infrastructure;
+
+namespace DaisiesContracts.DataModels;
+
+public class CustomerDiscountDataModel(string customerId, DateTime discountDateTime, decimal discount) : IValidation
+{
+    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");
+    }
+}
--- a/DaisiesContracts/Exceptions/ElementExistsException.cs
+++ b/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($"There is already an element with value{paramValue} of parameter {paramName}")
+	{
+		ParamName = paramName;
+		ParamValue = paramValue;
+	}
+}
--- a/DaisiesContracts/Exceptions/ElementNotFoundException.cs
+++ b/DaisiesContracts/Exceptions/ElementNotFoundException.cs
@@ -0,0 +1,11 @@
+namespace DaisiesContracts.Exceptions;
+
+public class ElementNotFoundException : Exception
+{
+	public string Value { get; private set; }
+
+	public ElementNotFoundException(string value) : base($"Element not found at value = {value}")
+	{
+		Value = value;
+	}
+}
--- a/DaisiesContracts/Exceptions/IncorrectDatesException.cs
+++ b/DaisiesContracts/Exceptions/IncorrectDatesException.cs
@@ -0,0 +1,6 @@
+namespace DaisiesContracts.Exceptions;
+
+public class IncorrectDatesException : Exception
+{
+	public IncorrectDatesException(DateTime start, DateTime end) : base($"The end date must be later than the start date.. StartDate: {start:dd.MM.YYYY}. EndDate: {end:dd.MM.YYYY}") { }
+}
--- a/DaisiesContracts/Exceptions/NullListException.cs
+++ b/DaisiesContracts/Exceptions/NullListException.cs
@@ -0,0 +1,6 @@
+namespace DaisiesContracts.Exceptions;
+
+public class NullListException : Exception
+{
+	public NullListException() : base("The returned list is null") { }
+}
--- a/DaisiesContracts/Exceptions/StorageException.cs
+++ b/DaisiesContracts/Exceptions/StorageException.cs
@@ -0,0 +1,6 @@
+namespace DaisiesContracts.Exceptions;
+
+public class StorageException : Exception
+{
+	public StorageException(Exception ex) : base($"Error while working in storage: {ex.Message}", ex) { }
+}
--- a/DaisiesContracts/Extensions/DateTimeExtensions.cs
+++ b/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;
+	}
+}
--- a/DaisiesContracts/StoragesContracts/IBouquetStorageContract.cs
+++ b/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);
+}
--- a/DaisiesContracts/StoragesContracts/ICustomerDiscountStorageContract.cs
+++ b/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);
+}
--- a/DaisiesContracts/StoragesContracts/ICustomerStorageContract.cs
+++ b/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);
+}
--- a/DaisiesContracts/StoragesContracts/IEmployeeStorageContract.cs
+++ b/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);
+}
--- a/DaisiesContracts/StoragesContracts/IFlowerStorageContract.cs
+++ b/DaisiesContracts/StoragesContracts/IFlowerStorageContract.cs
@@ -0,0 +1,18 @@
+using DaisiesContracts.DataModels;
+
+namespace DaisiesContracts.StoragesContracts;
+
+public interface IFlowerStorageContract
+{
+    List<FlowerDataModel> GetList(bool onlyActive = true);
+
+    FlowerDataModel? GetElementById(string id);
+
+    FlowerDataModel? GetElementByName(string name);
+
+    void AddElement(FlowerDataModel flowerDataModel);
+
+    void UpdElement(FlowerDataModel flowerDataModel);
+
+    void DelElement(string id);
+}
--- a/DaisiesProject.sln
+++ b/DaisiesProject.sln
@@ -5,7 +5,9 @@ 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("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DaisiesBusinessLogic", "DaisiesBusinessLogic\DaisiesBusinessLogic.csproj", "{006545EC-4A37-43DF-AE7F-4120BC98B2E2}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -21,6 +23,10 @@ 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
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
--- a/DaisiesTests/BusinessLogicsContractsTests/BouquetBusinessLogicContractTests.cs
+++ b/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);
+    }
+}
--- a/DaisiesTests/BusinessLogicsContractsTests/CustomerBusinessLogicContractTests.cs
+++ b/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", 0, DateTime.UtcNow),
+            new(Guid.NewGuid().ToString(), "fio 2", "+7-555-444-33-23", 10, DateTime.UtcNow),
+            new(Guid.NewGuid().ToString(), "fio 3", "+7-777-777-7777", 0, 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", 0, 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", 0, 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, 0, 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", 10, 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", 0, 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", 10, 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", 0, 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", 0, 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", 0, 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", 0, 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", 10, 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", 0, 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);
+    }
+}
--- a/DaisiesTests/BusinessLogicsContractsTests/CustomerDiscountBusinessLogicContractTests.cs
+++ b/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", 10, 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", 10, DateTime.UtcNow),
+            new(worker2Id, "Full Name", "+79999999999", 10, DateTime.UtcNow),
+            new(worker3Id, "Full Name", "+79999999999", 10, 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", 10, 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", 10, 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", 10, 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>());
+    }
+}
--- a/DaisiesTests/BusinessLogicsContractsTests/EmployeeBusinessLogicContractTests.cs
+++ b/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);
+    }
+}
--- a/DaisiesTests/BusinessLogicsContractsTests/FlowerBusinessLogicContractTests.cs
+++ b/DaisiesTests/BusinessLogicsContractsTests/FlowerBusinessLogicContractTests.cs
@@ -0,0 +1,333 @@
+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(It.IsAny<bool>())).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(true), Times.Once);
+        _productStorageContract.Verify(x => x.GetList(false), Times.Once);
+    }
+
+    [Test]
+    public void GetAllFlowers_ReturnEmptyList_Test()
+    {
+        //Arrange
+        _productStorageContract.Setup(x => x.GetList(It.IsAny<bool>())).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(It.IsAny<bool>()), 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(It.IsAny<bool>()), Times.Once);
+    }
+
+    [Test]
+    public void GetAllFlowers_StorageThrowError_ThrowException_Test()
+    {
+        //Arrange
+        _productStorageContract.Setup(x => x.GetList(It.IsAny<bool>())).Throws(new StorageException(new InvalidOperationException()));
+        //Act&Assert
+        Assert.That(() => _productBusinessLogicContract.GetAllFlowers(It.IsAny<bool>()), Throws.TypeOf<StorageException>());
+        _productStorageContract.Verify(x => x.GetList(It.IsAny<bool>()), 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);
+    }
+}
--- a/DaisiesTests/DaisiesTests.csproj
+++ b/DaisiesTests/DaisiesTests.csproj
@@ -10,7 +10,9 @@
  </PropertyGroup>

  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Logging" Version="9.0.2" />
    <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" />
@@ -18,6 +20,7 @@
  </ItemGroup>

  <ItemGroup>
+    <ProjectReference Include="..\DaisiesBusinessLogic\DaisiesBusinessLogic.csproj" />
    <ProjectReference Include="..\DaisiesContracts\DaisiesContracts.csproj" />
  </ItemGroup>

--- a/DaisiesTests/DataModelTests/BouquetDataModelTests.cs
+++ b/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) };
 }
--- a/DaisiesTests/DataModelTests/BouquetItemDataModelTests.cs
+++ b/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);
 }
--- a/DaisiesTests/DataModelTests/CustomerDiscountDataModelTests.cs
+++ b/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);
+}