Тесты + Program.cs (в 0 лабе удалил этот класс, а без него ничего не работает. А ведь никто и подумать не мог)

NorthBridgeProject/NorthBridgeContracts/DataModels/ComponentDataModel.cs

@@ -0,0 +1,39 @@
+using NorthBridgeContracts.Enums;
+using NorthBridgeContracts.Exceptions;
+using NorthBridgeContracts.Extensions;
+using NorthBridgeContracts.Infrastructure;
+
+namespace NorthBridgeContracts.DataModels;
+
+public class ComponentDataModel(string id, string componentName, ComponentType componentType, string manufacturerId, double price, bool isDeleted) : IValidation
+{
+    public string Id { get; private set; } = id;
+
+    public string ComponentName { get; private set; } = componentName;
+
+    public ComponentType ComponentType { get; private set; } = componentType;
+
+    public string ManufacturerId { get; private set; } = manufacturerId;
+
+    public double Price { get; private set; } = price;
+
+    public bool IsDeleted { get; private set; } = isDeleted;
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+        if (ComponentName.IsEmpty())
+            throw new ValidationException("Field ComponentName is empty");
+        if (ComponentType == ComponentType.None)
+            throw new ValidationException("Field ComponentType is empty");
+        if (ManufacturerId.IsEmpty())
+            throw new ValidationException("Field ManufacturerId is empty");
+        if (!ManufacturerId.IsGuid())
+            throw new ValidationException("The value in the field ManufacturerId is not a unique identifier");
+        if (Price <= 0)
+            throw new ValidationException("Field Price is less than or equal to 0");
+    }
+}

NorthBridgeProject/NorthBridgeContracts/DataModels/ComponentHistoryDataModel.cs

@@ -0,0 +1,24 @@
+using NorthBridgeContracts.Exceptions;
+using NorthBridgeContracts.Extensions;
+using NorthBridgeContracts.Infrastructure;
+
+namespace NorthBridgeContracts.DataModels;
+
+public class ComponentHistoryDataModel(string componentId, double oldPrice) : IValidation
+{
+    public string ComponentId { get; private set; } = componentId;
+
+    public double OldPrice { get; private set; } = oldPrice; // олд спайс
+
+    public DateTime ChangeDate { get; private set; } = DateTime.UtcNow;  // дата изменения цены
+
+    public void Validate()
+    {
+        if (ComponentId.IsEmpty())
+            throw new ValidationException("Field ComponentId is empty");
+        if (!ComponentId.IsGuid())
+            throw new ValidationException("The value in the field ComponentId is not a unique identifier");
+        if (OldPrice <= 0)
+            throw new ValidationException("Field OldPrice is less than or equal to 0");
+    }
+}

NorthBridgeProject/NorthBridgeContracts/DataModels/CustomerDataModel.cs

@@ -0,0 +1,29 @@
+using NorthBridgeContracts.Extensions;
+using NorthBridgeContracts.Infrastructure;
+using System.Text.RegularExpressions;
+using NorthBridgeContracts.Exceptions;
+
+namespace NorthBridgeContracts.DataModels;
+
+public class CustomerDataModel(string id, string fio, string phone, string email, double discountSize) : IValidation
+{
+    public string Id { get; private set; } = id;
+    public string FIO { get; private set; } = fio;
+    public string Phone { get; private set; } = phone;
+    public string Email { get; private set; } = email;
+    public double DiscountSize { get; private set; } = discountSize;
+
+    public void Validate()
+    {
+        if (Id.IsEmpty()) throw new ValidationException("Field Id is empty");
+        if (!Id.IsGuid()) throw new ValidationException("Id must be a GUID");
+        if (FIO.IsEmpty()) throw new ValidationException("Field FIO is empty");
+        if (Phone.IsEmpty()) throw new ValidationException("Field Phone is empty");
+
+        var phoneRegex = new Regex(@"^\+7\d{10}$");
+        if (!phoneRegex.IsMatch(Phone)) throw new ValidationException("Invalid phone format");
+
+        if (Email.IsEmpty() || !Email.Contains("@")) throw new ValidationException("Invalid email format");
+    }
+}
+

NorthBridgeProject/NorthBridgeContracts/DataModels/ManufacturerDataModel.cs

@@ -0,0 +1,26 @@
+using NorthBridgeContracts.Exceptions;
+using NorthBridgeContracts.Extensions;
+using NorthBridgeContracts.Infrastructure;
+
+namespace NorthBridgeContracts.DataModels;
+
+public class ManufacturerDataModel(string id, string manufacturerName, string?
+prevManufacturerName, string? prevPrevManufacturerName) : IValidation
+{
+    public string Id { get; private set; } = id;
+    public string ManufacturerName { get; private set; } = manufacturerName;
+    public string? PrevManufacturerName { get; private set; } =
+    prevManufacturerName;
+    public string? PrevPrevManufacturerName { get; private set; } =
+    prevPrevManufacturerName;
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+    if (ManufacturerName.IsEmpty())
+            throw new ValidationException("Field ManufacturerName isempty");
+    }
+}
+

NorthBridgeProject/NorthBridgeContracts/DataModels/PostDataModel.cs

@@ -0,0 +1,44 @@
+using NorthBridgeContracts.Enums;
+using NorthBridgeContracts.Exceptions;
+using NorthBridgeContracts.Extensions;
+using NorthBridgeContracts.Infrastructure;
+
+namespace NorthBridgeContracts.DataModels;
+
+public class PostDataModel(string id, string postId, string postName, PostType postType, double salary, bool isActual, DateTime changeDate) : IValidation
+{
+    public string Id { get; private set; } = id;
+
+    public string PostId { get; private set; } = postId;
+
+    public string PostName { get; private set; } = postName;
+
+    public PostType PostType { get; private set; } = postType;
+
+    public double Salary { get; private set; } = salary;
+
+    public bool IsActual { get; private set; } = isActual;
+
+    /// <summary>
+    /// Когда эта запись была изменена
+    /// </summary>
+    public DateTime ChangeDate { get; private set; } = changeDate;
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+        if (PostId.IsEmpty())
+            throw new ValidationException("Field PostId is empty");
+        if (!PostId.IsGuid())
+            throw new ValidationException("The value in the field PostId is not a unique identifier");
+        if (PostName.IsEmpty())
+            throw new ValidationException("Field PostName is empty");
+        if (PostType == PostType.None)
+            throw new ValidationException("Field PostName is empty");
+        if (Salary <= 0)
+            throw new ValidationException("Field Salary is empty");
+    }
+}

NorthBridgeProject/NorthBridgeContracts/DataModels/SalaryDataModel.cs

@@ -0,0 +1,25 @@
+using NorthBridgeContracts.Exceptions;
+using NorthBridgeContracts.Extensions;
+using NorthBridgeContracts.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+namespace NorthBridgeContracts.DataModels;
+
+public class SalaryDataModel(string workerId, DateTime salaryDate, double workerSalary) : IValidation
+{
+    public string WorkerId { get; private set; } = workerId;
+
+    public DateTime SalaryDate { get; private set; } = salaryDate;
+
+    public double Salary { get; private set; } = workerSalary;
+    public void Validate()
+    {
+        if (WorkerId.IsEmpty())
+            throw new ValidationException("Field WorkerId is empty");
+        if (!WorkerId.IsGuid())
+            throw new ValidationException("The value in the field WorkerId is not a unique identifier");
+        if (Salary <= 0)
+            throw new ValidationException("Field Salary is less than or equal to 0");
+    }
+}

NorthBridgeProject/NorthBridgeContracts/DataModels/SaleDataModel.cs

@@ -0,0 +1,37 @@
+using NorthBridgeContracts.Enums;
+using NorthBridgeContracts.Exceptions;
+using NorthBridgeContracts.Extensions;
+using NorthBridgeContracts.Infrastructure;
+
+namespace NorthBridgeContracts.DataModels;
+
+public class SaleDataModel(string id, string workerId, string? customerId, double sum, DiscountType discountType, double discount, bool isCancel, List<SaleProductDataModel> products) : IValidation
+{
+    public string Id { get; private set; } = id;
+    public string WorkerId { get; private set; } = workerId;
+    public string? CustomerId { get; private set; } = customerId;
+    public DateTime SaleDate { get; private set; } = DateTime.UtcNow;
+    public double Sum { get; private set; } = sum;
+    public DiscountType DiscountType { get; private set; } = discountType;
+    public double Discount { get; private set; } = discount;
+    public bool IsCancel { get; private set; } = isCancel;
+    public List<SaleProductDataModel> Products { get; private set; } =
+    products;
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+        if (WorkerId.IsEmpty())
+            throw new ValidationException("Field WorkerId is empty");
+        if (!WorkerId.IsGuid())
+            throw new ValidationException("The value in the field WorkerId is not a unique identifier");
+        if (!CustomerId?.IsGuid() ?? !CustomerId?.IsEmpty() ?? false)
+            throw new ValidationException("The value in the field BuyerId is not a unique identifier");
+        if (Sum <= 0)
+            throw new ValidationException("Field Sum is less than or equal to 0");
+        if ((Products?.Count ?? 0) == 0)
+            throw new ValidationException("The sale must include products");
+    }
+}

NorthBridgeProject/NorthBridgeContracts/DataModels/SaleProductDataModel.cs

@@ -0,0 +1,33 @@
+using NorthBridgeContracts.Exceptions;
+using NorthBridgeContracts.Extensions;
+using NorthBridgeContracts.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NorthBridgeContracts.DataModels;
+
+public class SaleProductDataModel(string saleId, string productId, int count) : IValidation
+{
+    public string SaleId { get; private set; } = saleId;
+
+    public string ProductId { get; private set; } = productId;
+
+    public int Count { get; private set; } = count;
+
+    public void Validate()
+    {
+        if (SaleId.IsEmpty())
+            throw new ValidationException("Field SaleId is empty");
+        if (!SaleId.IsGuid())
+            throw new ValidationException("The value in the field SaleId is not a unique identifier");
+        if (ProductId.IsEmpty())
+            throw new ValidationException("Field ProductId is empty");
+        if (!ProductId.IsGuid())
+            throw new ValidationException("The value in the field ProductId is not a unique identifier");
+        if (Count <= 0)
+            throw new ValidationException("Field Count is less than or equal to 0");
+    }
+}

NorthBridgeProject/NorthBridgeContracts/DataModels/WorkerDataModel.cs

@@ -0,0 +1,40 @@
+using NorthBridgeContracts.Exceptions;
+using NorthBridgeContracts.Extensions;
+using NorthBridgeContracts.Infrastructure;
+
+namespace NorthBridgeContracts.DataModels;
+
+public class WorkerDataModel(string id, string fio, string postId, DateTime birthDate, DateTime employmentDate, bool isDeleted) : IValidation
+{
+    public string Id { get; private set; } = id;
+
+    public string FIO { get; private set; } = fio;
+
+    public string PostId { get; private set; } = postId;
+
+    public DateTime BirthDate { get; private set; } = birthDate;
+
+    public DateTime EmploymentDate { get; private set; } = employmentDate;
+
+    public bool IsDeleted { get; private set; } = isDeleted;  // признак уволился или нет
+
+    public void Validate()
+    {
+        if (Id.IsEmpty())
+            throw new ValidationException("Field Id is empty");
+        if (!Id.IsGuid())
+            throw new ValidationException("The value in the field Id is not a unique identifier");
+        if (FIO.IsEmpty())
+            throw new ValidationException("Field FIO is empty");
+        if (PostId.IsEmpty())
+            throw new ValidationException("Field PostId is empty");
+        if (!PostId.IsGuid())
+            throw new ValidationException("The value in the field PostId is not a unique identifier");
+        if (BirthDate.Date > DateTime.Now.AddYears(-16).Date)
+            throw new ValidationException($"Minors cannot be hired (BirthDate = {BirthDate.ToShortDateString()})");
+        if (EmploymentDate.Date < BirthDate.Date)
+            throw new ValidationException("The date of employment caanot be less than the date of birth");
+        if ((EmploymentDate - BirthDate).TotalDays / 365 < 16)
+            throw new ValidationException($"Minors cannot be hired (EmploymentDate - {EmploymentDate.ToShortDateString()}, BirthDate - {BirthDate.ToShortDateString()})");
+    }
+}

NorthBridgeProject/NorthBridgeContracts/Enums/ComponentType.cs

@@ -0,0 +1,17 @@
+namespace NorthBridgeContracts.Enums;
+
+public enum ComponentType
+{
+    None = 0,           // Не указано
+    Motherboard = 1,       // Мать
+    Processor = 2,      // Процессор
+    Ram = 3,            // Оперативка
+    PowerUnit = 4,    // БП
+    GraphicsCard = 5,      // Видюха
+    SVO = 6,         // Система Воздушного Охлаждения (кулеры)
+    SJO = 7,         // Система ЖИДкостного Охлаждения
+    Case = 8,           // Кейс
+    Storage = 9,        // Накопитель (SSD и HDD)
+    Monitor = 10,       // Монитор
+    Peripheral = 11       // Периферия (мышки клавы уши, крч I/O Devices)
+}

NorthBridgeProject/NorthBridgeContracts/Enums/DiscountType.cs

@@ -0,0 +1,12 @@
+namespace NorthBridgeContracts.Enums;
+
+
+[Flags]
+public enum DiscountType
+{
+    None = 0,               // Без скидки
+    SeasonalSale = 1,       // Сезонная распродажа
+    LoyaltyProgram = 2,     // Программа ноу лоялти ноу роялти
+    BundleDiscount = 4,     // Скидка за комплект
+    PromoCode = 8           // Скидка по промокоду
+}

NorthBridgeProject/NorthBridgeContracts/Enums/PostType.cs

@@ -0,0 +1,10 @@
+namespace NorthBridgeContracts.Enums;
+
+public enum PostType
+{
+    None = 0,               // Не указано
+    Manager = 1,            // Менеджер (административная должность)
+    SalesSpecialist = 2,    // Специалист по продажам
+    TechnicalSpecialist = 3, // Технический специалист
+    StockmanDNS = 4            // Кладовщик
+}

NorthBridgeProject/NorthBridgeContracts/Exceptions/ValidationException.cs

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

NorthBridgeProject/NorthBridgeContracts/Extensions/StringExtensions.cs

@@ -0,0 +1,13 @@
+namespace NorthBridgeContracts.Extensions;
+
+public static class StringExtensions
+{
+    public static bool IsEmpty(this string str)
+    {
+        return string.IsNullOrWhiteSpace(str);
+    }
+    public static bool IsGuid(this string str)
+    {
+        return Guid.TryParse(str, out _);
+    }
+}

NorthBridgeProject/NorthBridgeContracts/Infrastructure/IValidation.cs

@@ -0,0 +1,6 @@
+namespace NorthBridgeContracts.Infrastructure;
+
+public interface IValidation
+{
+    void Validate();
+}

NorthBridgeProject/NorthBridgeContracts/Program.cs

@@ -0,0 +1,8 @@
+namespace NorthBridgeContracts;
+
+public class Program
+{
+    public static void Main(string[] args)
+    {
+    }
+}

NorthBridgeProject/NorthBridgeProject.sln

@@ -1,10 +1,12 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
-VisualStudioVersion = 17.13.35806.99 d17.13
+VisualStudioVersion = 17.13.35806.99
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NorthBridgeContracts", "NorthBridgeContracts\NorthBridgeContracts.csproj", "{5D0CC2D9-4A29-4E1E-ACE0-45B3E79C9A84}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "NorthBridgeTests", "NorthBridgeTests\NorthBridgeTests.csproj", "{D12DDAC8-166D-49A8-A926-7C7048EF98C4}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -15,6 +17,10 @@ Global
 		{5D0CC2D9-4A29-4E1E-ACE0-45B3E79C9A84}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{5D0CC2D9-4A29-4E1E-ACE0-45B3E79C9A84}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{5D0CC2D9-4A29-4E1E-ACE0-45B3E79C9A84}.Release|Any CPU.Build.0 = Release|Any CPU
+		{D12DDAC8-166D-49A8-A926-7C7048EF98C4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{D12DDAC8-166D-49A8-A926-7C7048EF98C4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{D12DDAC8-166D-49A8-A926-7C7048EF98C4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{D12DDAC8-166D-49A8-A926-7C7048EF98C4}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

NorthBridgeProject/NorthBridgeTests/DataModelsTests/ComponentDataModelTests.cs

@@ -0,0 +1,97 @@
+using NorthBridgeContracts.DataModels;
+using NorthBridgeContracts.Enums;
+using NorthBridgeContracts.Exceptions;
+
+namespace NorthBridgeTests.DataModelsTests;
+
+[TestFixture]
+internal class ComponentDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var component = CreateDataModel(null, "ComponentName", ComponentType.Motherboard, Guid.NewGuid().ToString(), 100, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+
+        component = CreateDataModel(string.Empty, "ComponentName", ComponentType.Motherboard, Guid.NewGuid().ToString(), 100, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var component = CreateDataModel("not-a-guid", "ComponentName", ComponentType.Motherboard, Guid.NewGuid().ToString(), 100, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ComponentNameIsNullOrEmptyTest()
+    {
+        var component = CreateDataModel(Guid.NewGuid().ToString(), null, ComponentType.Motherboard, Guid.NewGuid().ToString(), 100, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+
+        component = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, ComponentType.Motherboard, Guid.NewGuid().ToString(), 100, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ComponentTypeIsNoneTest()
+    {
+        var component = CreateDataModel(Guid.NewGuid().ToString(), "ComponentName", ComponentType.None, Guid.NewGuid().ToString(), 100, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ManufacturerIdIsNullOrEmptyTest()
+    {
+        var component = CreateDataModel(Guid.NewGuid().ToString(), "ComponentName", ComponentType.Motherboard, null, 100, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+
+        component = CreateDataModel(Guid.NewGuid().ToString(), "ComponentName", ComponentType.Motherboard, string.Empty, 100, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ManufacturerIdIsNotGuidTest()
+    {
+        var component = CreateDataModel(Guid.NewGuid().ToString(), "ComponentName", ComponentType.Motherboard, "not-a-guid", 100, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PriceIsLessOrEqualToZeroTest()
+    {
+        var component = CreateDataModel(Guid.NewGuid().ToString(), "ComponentName", ComponentType.Motherboard, Guid.NewGuid().ToString(), 0, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+
+        component = CreateDataModel(Guid.NewGuid().ToString(), "ComponentName", ComponentType.Motherboard, Guid.NewGuid().ToString(), -100, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsAreCorrectTest()
+    {
+        var componentId = Guid.NewGuid().ToString();
+        var componentName = "ComponentName";
+        var componentType = ComponentType.Motherboard;
+        var manufacturerId = Guid.NewGuid().ToString();
+        var price = 100.0;
+        var isDeleted = false;
+
+        var component = CreateDataModel(componentId, componentName, componentType, manufacturerId, price, isDeleted);
+
+        Assert.That(() => component.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(component.Id, Is.EqualTo(componentId));
+            Assert.That(component.ComponentName, Is.EqualTo(componentName));
+            Assert.That(component.ComponentType, Is.EqualTo(componentType));
+            Assert.That(component.ManufacturerId, Is.EqualTo(manufacturerId));
+            Assert.That(component.Price, Is.EqualTo(price));
+            Assert.That(component.IsDeleted, Is.EqualTo(isDeleted));
+        });
+    }
+
+    private static ComponentDataModel CreateDataModel(string? id, string? componentName, ComponentType componentType, string? manufacturerId, double price, bool isDeleted) =>
+        new(id, componentName, componentType, manufacturerId, price, isDeleted);
+}

NorthBridgeProject/NorthBridgeTests/DataModelsTests/ComponentHistoryDataModelTests.cs

@@ -0,0 +1,63 @@
+using NorthBridgeContracts.DataModels;
+using NorthBridgeContracts.Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NorthBridgeTests.DataModelsTests;
+
+[TestFixture]
+internal class ComponentHistoryDataModelTests
+{
+    [Test]
+    public void ComponentIdIsNullOrEmptyTest()
+    {
+        var component = CreateDataModel(null, 10);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+
+        component = CreateDataModel(string.Empty, 10);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ComponentIdIsNotGuidTest()
+    {
+        var component = CreateDataModel("id", 10);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void OldPriceIsLessOrZeroTest()
+    {
+        var component = CreateDataModel(Guid.NewGuid().ToString(), 0);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+
+        component = CreateDataModel(Guid.NewGuid().ToString(), -10);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsAreCorrectTest()
+    {
+        var componentId = Guid.NewGuid().ToString();
+        var oldPrice = 10;
+        var componentHistory = CreateDataModel(componentId, oldPrice);
+
+        Assert.That(() => componentHistory.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(componentHistory.ComponentId, Is.EqualTo(componentId));
+            Assert.That(componentHistory.OldPrice, Is.EqualTo(oldPrice));
+            Assert.That(componentHistory.ChangeDate, Is.LessThan(DateTime.UtcNow));
+            Assert.That(componentHistory.ChangeDate, Is.GreaterThan(DateTime.UtcNow.AddMinutes(-1)));
+        });
+    }
+
+    private static ComponentHistoryDataModel CreateDataModel(string? componentId, double oldPrice) =>
+        new(componentId, oldPrice);
+}
+
+
+

NorthBridgeProject/NorthBridgeTests/DataModelsTests/CustomerDataModelTests.cs

@@ -0,0 +1,99 @@
+using NorthBridgeContracts.DataModels;
+using NorthBridgeContracts.Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+namespace NorthBridgeTests.DataModelsTests;
+
+[TestFixture]
+internal class CustomerDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var customer = CreateDataModel(null, "FIO", "+71234567890", "test@example.com", 10);
+        Assert.That(() => customer.Validate(), Throws.TypeOf<ValidationException>());
+
+        customer = CreateDataModel(string.Empty, "FIO", "+71234567890", "test@example.com", 10);
+        Assert.That(() => customer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var customer = CreateDataModel("not-a-guid", "FIO", "+71234567890", "test@example.com", 10);
+        Assert.That(() => customer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void FIOIsNullOrEmptyTest()
+    {
+        var customer = CreateDataModel(Guid.NewGuid().ToString(), null, "+71234567890", "test@example.com", 10);
+        Assert.That(() => customer.Validate(), Throws.TypeOf<ValidationException>());
+
+        customer = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, "+71234567890", "test@example.com", 10);
+        Assert.That(() => customer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PhoneIsNullOrEmptyTest()
+    {
+        var customer = CreateDataModel(Guid.NewGuid().ToString(), "FIO", null, "test@example.com", 10);
+        Assert.That(() => customer.Validate(), Throws.TypeOf<ValidationException>());
+
+        customer = CreateDataModel(Guid.NewGuid().ToString(), "FIO", string.Empty, "test@example.com", 10);
+        Assert.That(() => customer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PhoneIsIncorrectFormatTest()
+    {
+        var customer = CreateDataModel(Guid.NewGuid().ToString(), "FIO", "22814881337", "test@example.com", 10);
+        Assert.That(() => customer.Validate(), Throws.TypeOf<ValidationException>());
+
+        customer = CreateDataModel(Guid.NewGuid().ToString(), "FIO", "+7123456789", "test@example.com", 10);
+        Assert.That(() => customer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void EmailIsNullOrEmptyTest()
+    {
+        var customer = CreateDataModel(Guid.NewGuid().ToString(), "FIO", "+71234567890", null, 10);
+        Assert.That(() => customer.Validate(), Throws.TypeOf<ValidationException>());
+
+        customer = CreateDataModel(Guid.NewGuid().ToString(), "FIO", "+71234567890", string.Empty, 10);
+        Assert.That(() => customer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void EmailIsIncorrectFormatTest()
+    {
+        var customer = CreateDataModel(Guid.NewGuid().ToString(), "FIO", "+71234567890", "invalid-email", 10);
+        Assert.That(() => customer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsAreCorrectTest()
+    {
+        var customerId = Guid.NewGuid().ToString();
+        var fio = "FIO";
+        var phone = "+71234567890";
+        var email = "Kotcheshir@example.com";
+        var discountSize = 10;
+
+        var customer = CreateDataModel(customerId, fio, phone, email, discountSize);
+
+        Assert.That(() => customer.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(customer.Id, Is.EqualTo(customerId));
+            Assert.That(customer.FIO, Is.EqualTo(fio));
+            Assert.That(customer.Phone, Is.EqualTo(phone));
+            Assert.That(customer.Email, Is.EqualTo(email));
+            Assert.That(customer.DiscountSize, Is.EqualTo(discountSize));
+        });
+    }
+
+    private static CustomerDataModel CreateDataModel(string? id, string? fio, string? phone, string? email, double discountSize) =>
+        new(id, fio, phone, email, discountSize);
+}

NorthBridgeProject/NorthBridgeTests/DataModelsTests/ManufacturerDataModelTests.cs

@@ -0,0 +1,58 @@
+using NorthBridgeContracts.DataModels;
+using NorthBridgeContracts.Exceptions;
+
+namespace NorthBridgeTests.DataModelsTests;
+
+[TestFixture]
+internal class ManufacturerDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var manufacturer = CreateDataModel(null, "ManufacturerName");
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+
+        manufacturer = CreateDataModel(string.Empty, "ManufacturerName");
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var manufacturer = CreateDataModel("not-a-guid", "ManufacturerName");
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ManufacturerNameIsNullOrEmptyTest()
+    {
+        var manufacturer = CreateDataModel(Guid.NewGuid().ToString(), null);
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+
+        manufacturer = CreateDataModel(Guid.NewGuid().ToString(), string.Empty);
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsAreCorrectTest()
+    {
+        var manufacturerId = Guid.NewGuid().ToString();
+        var manufacturerName = "ManufacturerName";
+        var prevManufacturerName = "PrevManufacturerName";
+        var prevPrevManufacturerName = "PrevPrevManufacturerName";
+
+        var manufacturer = CreateDataModel(manufacturerId, manufacturerName, prevManufacturerName, prevPrevManufacturerName);
+
+        Assert.That(() => manufacturer.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(manufacturer.Id, Is.EqualTo(manufacturerId));
+            Assert.That(manufacturer.ManufacturerName, Is.EqualTo(manufacturerName));
+            Assert.That(manufacturer.PrevManufacturerName, Is.EqualTo(prevManufacturerName));
+            Assert.That(manufacturer.PrevPrevManufacturerName, Is.EqualTo(prevPrevManufacturerName));
+        });
+    }
+
+    private static ManufacturerDataModel CreateDataModel(string? id, string? manufacturerName, string? prevManufacturerName = null, string? prevPrevManufacturerName = null) =>
+        new(id, manufacturerName, prevManufacturerName, prevPrevManufacturerName);
+}

NorthBridgeProject/NorthBridgeTests/DataModelsTests/PostDataModelTests.cs

@@ -0,0 +1,104 @@
+using NorthBridgeContracts.DataModels;
+using NorthBridgeContracts.Enums;
+using NorthBridgeContracts.Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NorthBridgeTests.DataModelsTests;
+
+[TestFixture]
+internal class PostDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var post = CreateDataModel(null, Guid.NewGuid().ToString(), "PostName", PostType.Manager, 1000, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+
+        post = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), "PostName", PostType.Manager, 1000, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var post = CreateDataModel("not-a-guid", Guid.NewGuid().ToString(), "PostName", PostType.Manager, 1000, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostIdIsNullOrEmptyTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), null, "PostName", PostType.Manager, 1000, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+
+        post = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, "PostName", PostType.Manager, 1000, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostIdIsNotGuidTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), "not-a-guid", "PostName", PostType.Manager, 1000, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostNameIsNullOrEmptyTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, PostType.Manager, 1000, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+
+        post = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), string.Empty, PostType.Manager, 1000, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostTypeIsNoneTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "PostName", PostType.None, 1000, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void SalaryIsLessOrEqualToZeroTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "PostName", PostType.Manager, 0, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+
+        post = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "PostName", PostType.Manager, -1000, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsAreCorrectTest()
+    {
+        var postId = Guid.NewGuid().ToString();
+        var postPostId = Guid.NewGuid().ToString();
+        var postName = "PostName";
+        var postType = PostType.Manager;
+        var salary = 1000.0;
+        var isActual = true;
+        var changeDate = DateTime.UtcNow;
+
+        var post = CreateDataModel(postId, postPostId, postName, postType, salary, isActual, changeDate);
+
+        Assert.That(() => post.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(post.Id, Is.EqualTo(postId));
+            Assert.That(post.PostId, Is.EqualTo(postPostId));
+            Assert.That(post.PostName, Is.EqualTo(postName));
+            Assert.That(post.PostType, Is.EqualTo(postType));
+            Assert.That(post.Salary, Is.EqualTo(salary));
+            Assert.That(post.IsActual, Is.EqualTo(isActual));
+            Assert.That(post.ChangeDate, Is.EqualTo(changeDate));
+        });
+    }
+
+    private static PostDataModel CreateDataModel(string? id, string? postId, string? postName, PostType postType, double salary, bool isActual, DateTime changeDate) =>
+        new(id, postId, postName, postType, salary, isActual, changeDate);
+}

NorthBridgeProject/NorthBridgeTests/DataModelsTests/SalaryDataModelTests.cs

@@ -0,0 +1,59 @@
+using NorthBridgeContracts.DataModels;
+using NorthBridgeContracts.Exceptions;
+namespace NorthBridgeTests.DataModelsTests;
+
+[TestFixture]
+internal class SalaryDataModelTests
+{
+    [Test]
+    public void WorkerIdIsEmptyTest()
+    {
+        var salary = CreateDataModel(null, DateTime.Now, 10);
+        Assert.That(() => salary.Validate(),
+            Throws.TypeOf<ValidationException>());
+
+        salary = CreateDataModel(string.Empty, DateTime.Now, 10);
+        Assert.That(() => salary.Validate(),
+            Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void WorkerIdIsNotGuidTest()
+    {
+        var salary = CreateDataModel("workerId", DateTime.Now, 10);
+        Assert.That(() => salary.Validate(),
+            Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void SalaryIsLessOrZeroTest()
+    {
+        var salary = CreateDataModel(Guid.NewGuid().ToString(), DateTime.Now, 0);
+        Assert.That(() => salary.Validate(),
+            Throws.TypeOf<ValidationException>());
+
+        salary = CreateDataModel(Guid.NewGuid().ToString(), DateTime.Now, -10);
+        Assert.That(() => salary.Validate(),
+            Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsAreCorrectTest()
+    {
+        var workerId = Guid.NewGuid().ToString();
+        var salaryDate = DateTime.Now.AddDays(-3).AddMinutes(-5);
+        var workerSalary = 10;
+        var salary = CreateDataModel(workerId, salaryDate, workerSalary);
+
+        Assert.That(() => salary.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(salary.WorkerId, Is.EqualTo(workerId));
+            Assert.That(salary.SalaryDate, Is.EqualTo(salaryDate));
+            Assert.That(salary.Salary, Is.EqualTo(workerSalary));
+        });
+    }
+
+    private static SalaryDataModel CreateDataModel(string? workerId, DateTime salaryDate, double workerSalary) =>
+        new(workerId, salaryDate, workerSalary);
+}

NorthBridgeProject/NorthBridgeTests/DataModelsTests/SaleDataModelTests.cs

@@ -0,0 +1,68 @@
+using NorthBridgeContracts.DataModels;
+using NorthBridgeContracts.Enums;
+using NorthBridgeContracts.Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NorthBridgeTests.DataModelsTests;
+
+[TestFixture]
+public class SaleDataModelTests
+{
+    [Test]
+    public void IdIsEmptyOrNullTest()
+    {
+        Assert.Throws<ValidationException>(() => new SaleDataModel(null, Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.None, 0, false, new List<SaleProductDataModel>()).Validate());
+        Assert.Throws<ValidationException>(() => new SaleDataModel(string.Empty, Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.None, 0, false, new List<SaleProductDataModel>()).Validate());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        Assert.Throws<ValidationException>(() => new SaleDataModel("invalidGuid", Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.None, 0, false, new List<SaleProductDataModel>()).Validate());
+    }
+
+    [Test]
+    public void WorkerIdIsEmptyOrNullTest()
+    {
+        Assert.Throws<ValidationException>(() => new SaleDataModel(Guid.NewGuid().ToString(), null, Guid.NewGuid().ToString(), 10, DiscountType.None, 0, false, new List<SaleProductDataModel>()).Validate());
+        Assert.Throws<ValidationException>(() => new SaleDataModel(Guid.NewGuid().ToString(), string.Empty, Guid.NewGuid().ToString(), 10, DiscountType.None, 0, false, new List<SaleProductDataModel>()).Validate());
+    }
+
+    [Test]
+    public void WorkerIdIsNotGuidTest()
+    {
+        Assert.Throws<ValidationException>(() => new SaleDataModel(Guid.NewGuid().ToString(), "invalidGuid", Guid.NewGuid().ToString(), 10, DiscountType.None, 0, false, new List<SaleProductDataModel>()).Validate());
+    }
+
+    [Test]
+    public void CustomerIdIsNotGuidTest()
+    {
+        Assert.Throws<ValidationException>(() => new SaleDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "invalidGuid", 10, DiscountType.None, 0, false, new List<SaleProductDataModel>()).Validate());
+    }
+
+    [Test]
+    public void SumIsLessOrZeroTest()
+    {
+        Assert.Throws<ValidationException>(() => new SaleDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 0, DiscountType.None, 0, false, new List<SaleProductDataModel>()).Validate());
+        Assert.Throws<ValidationException>(() => new SaleDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), -10, DiscountType.None, 0, false, new List<SaleProductDataModel>()).Validate());
+    }
+
+    [Test]
+    public void ProductsIsNullOrEmptyTest()
+    {
+        Assert.Throws<ValidationException>(() => new SaleDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.None, 0, false, null).Validate());
+        Assert.Throws<ValidationException>(() => new SaleDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.None, 0, false, new List<SaleProductDataModel>()).Validate());
+    }
+
+    [Test]
+    public void AllFieldsAreValidTest()
+    {
+        var sale = new SaleDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.None, 0, false,
+            new List<SaleProductDataModel> { new SaleProductDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 1) });
+        Assert.DoesNotThrow(() => sale.Validate());
+    }
+}

NorthBridgeProject/NorthBridgeTests/DataModelsTests/SaleProductDataModelTests.cs

@@ -0,0 +1,53 @@
+using NorthBridgeContracts.DataModels;
+using NorthBridgeContracts.Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NorthBridgeTests.DataModelsTests;
+
+[TestFixture]
+public class SaleProductDataModelTests
+{
+    [Test]
+    public void SaleIdIsEmptyOrNullTest()
+    {
+        Assert.Throws<ValidationException>(() => new SaleProductDataModel(null, Guid.NewGuid().ToString(), 10).Validate());
+        Assert.Throws<ValidationException>(() => new SaleProductDataModel("", Guid.NewGuid().ToString(), 10).Validate());
+    }
+
+    [Test]
+    public void SaleIdIsNotGuidTest()
+    {
+        Assert.Throws<ValidationException>(() => new SaleProductDataModel("invalidGuid", Guid.NewGuid().ToString(), 10).Validate());
+    }
+
+    [Test]
+    public void ProductIdIsEmptyOrNullTest()
+    {
+        Assert.Throws<ValidationException>(() => new SaleProductDataModel(Guid.NewGuid().ToString(), null, 10).Validate());
+        Assert.Throws<ValidationException>(() => new SaleProductDataModel(Guid.NewGuid().ToString(), "", 10).Validate());
+    }
+
+    [Test]
+    public void ProductIdIsNotGuidTest()
+    {
+        Assert.Throws<ValidationException>(() => new SaleProductDataModel(Guid.NewGuid().ToString(), "invalidGuid", 10).Validate());
+    }
+
+    [Test]
+    public void CountIsLessOrZeroTest()
+    {
+        Assert.Throws<ValidationException>(() => new SaleProductDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 0).Validate());
+        Assert.Throws<ValidationException>(() => new SaleProductDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), -1).Validate());
+    }
+
+    [Test]
+    public void AllFieldsAreValidTest()
+    {
+        var saleProduct = new SaleProductDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10);
+        Assert.DoesNotThrow(() => saleProduct.Validate());
+    }
+}

NorthBridgeProject/NorthBridgeTests/DataModelsTests/WorkerDataModelTests.cs

@@ -0,0 +1,100 @@
+using NorthBridgeContracts.DataModels;
+using NorthBridgeContracts.Exceptions;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NorthBridgeTests.DataModelsTests;
+
+[TestFixture]
+internal class WorkerDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var worker = CreateDataModel(null, "fio", Guid.NewGuid().ToString(), DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+
+        worker = CreateDataModel(string.Empty, "fio", Guid.NewGuid().ToString(), DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var worker = CreateDataModel("id", "fio", Guid.NewGuid().ToString(), DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void FIOIsNullOrEmptyTest()
+    {
+        var worker = CreateDataModel(Guid.NewGuid().ToString(), null, Guid.NewGuid().ToString(), DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+
+        worker = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, Guid.NewGuid().ToString(), DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostIdIsNullOrEmptyTest()
+    {
+        var worker = CreateDataModel(Guid.NewGuid().ToString(), "fio", null, DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+
+        worker = CreateDataModel(Guid.NewGuid().ToString(), "fio", string.Empty, DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostIdIsNotGuidTest()
+    {
+        var worker = CreateDataModel(Guid.NewGuid().ToString(), "fio", "postId", DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void BirthDateIsNotCorrectTest()
+    {
+        var worker = CreateDataModel(Guid.NewGuid().ToString(), "fio", Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16).AddDays(1), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void BirthDateAndEmploymentDateIsNotCorrectTest()
+    {
+        var worker = CreateDataModel(Guid.NewGuid().ToString(), "fio", Guid.NewGuid().ToString(), DateTime.Now.AddYears(-18), DateTime.Now.AddYears(-18).AddDays(-1), false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+
+        worker = CreateDataModel(Guid.NewGuid().ToString(), "fio", Guid.NewGuid().ToString(), DateTime.Now.AddYears(-18), DateTime.Now.AddYears(-16), false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsAreCorrectTest()
+    {
+        var workerId = Guid.NewGuid().ToString();
+        var fio = "fio";
+        var postId = Guid.NewGuid().ToString();
+        var birthDate = DateTime.Now.AddYears(-16).AddDays(-1);
+        var employmentDate = DateTime.Now;
+        var isDelete = false;
+        var worker = CreateDataModel(workerId, fio, postId, birthDate, employmentDate, isDelete);
+
+        Assert.That(() => worker.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(worker.Id, Is.EqualTo(workerId));
+            Assert.That(worker.FIO, Is.EqualTo(fio));
+            Assert.That(worker.PostId, Is.EqualTo(postId));
+            Assert.That(worker.BirthDate, Is.EqualTo(birthDate));
+            Assert.That(worker.EmploymentDate, Is.EqualTo(employmentDate));
+            Assert.That(worker.IsDeleted, Is.EqualTo(isDelete));
+        });
+    }
+
+    private static WorkerDataModel CreateDataModel(string? id, string? fio, string? postId, DateTime birthDate, DateTime employmentDate, bool isDeleted) =>
+        new(id, fio, postId, birthDate, employmentDate, isDeleted);
+}

NorthBridgeProject/NorthBridgeTests/NorthBridgeTests.csproj

@@ -0,0 +1,27 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <LangVersion>latest</LangVersion>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.2" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="NUnit" Version="4.2.2" />
+    <PackageReference Include="NUnit.Analyzers" Version="4.4.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.6.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\NorthBridgeContracts\NorthBridgeContracts.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="NUnit.Framework" />
+  </ItemGroup>
+
+</Project>