1.ValidationTests

IcecreamVan/IcecreamVan.csproj

@@ -0,0 +1,9 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

IcecreamVan/SnowMaidenContracts/DataModels/ManufacturerDataModel.cs

@@ -0,0 +1,28 @@
+using SnowMaidenContracts.Exceptions;
+using SnowMaidenContracts.Extensions;
+using SnowMaidenContracts.Infrastructure;
+
+namespace SnowMaidenContracts.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 field ID value is NOT a unique identifier");
+
+		if (ManufacturerName.IsEmpty())
+			throw new ValidationException("Field ManufacturerName is empty");
+	}
+}

IcecreamVan/SnowMaidenContracts/DataModels/PostDataModel.cs

@@ -0,0 +1,47 @@
+using SnowMaidenContracts.Enums;
+using SnowMaidenContracts.Exceptions;
+using SnowMaidenContracts.Extensions;
+using SnowMaidenContracts.Infrastructure;
+
+namespace SnowMaidenContracts.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;
+
+	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 ID value is NOT a unique identifier");
+
+		if (PostId.IsEmpty())
+			throw new ValidationException("Field Post ID is empty");
+
+		if (!PostId.IsGuid())
+			throw new ValidationException("The Post ID value is NOT a unique identifier");
+
+		if (PostName.IsEmpty())
+			throw new ValidationException("Name is empty");
+
+		if (PostType == PostType.None)
+			throw new ValidationException("Type is empty");
+
+		if (Salary <= 0)
+			throw new ValidationException("Salary is empty");
+	}
+}

IcecreamVan/SnowMaidenContracts/DataModels/ProductDataModel.cs

@@ -0,0 +1,40 @@
+using SnowMaidenContracts.Enums;
+using SnowMaidenContracts.Exceptions;
+using SnowMaidenContracts.Extensions;
+using SnowMaidenContracts.Infrastructure;
+
+namespace SnowMaidenContracts.DataModels;
+
+// 4. У продукта, в свою очередь, есть производитель (Manufacturer -> Product) и тип (перечисление),
+// а также информация об изменениях расценки (Product -> 5. History)
+
+public class ProductDataModel(string id, string productName, ProductType productType, double price, bool isDeleted) : IValidation
+{
+	public string Id { get; private set; } = id;
+
+	public string ProductName { get; private set; } = productName;
+
+	public ProductType ProductType { get; private set; } = productType;
+
+	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 ID value is NOT a unique identifier");
+
+		if (ProductName.IsEmpty())
+			throw new ValidationException("Name is empty");
+
+		if (ProductType == ProductType.None)
+			throw new ValidationException("Type is empty");
+
+		if (Price <= 0)
+			throw new ValidationException("Field Price is less than or equal to 0");
+	}
+}

IcecreamVan/SnowMaidenContracts/DataModels/ProductHistoryDataModel.cs

@@ -0,0 +1,26 @@
+using SnowMaidenContracts.Exceptions;
+using SnowMaidenContracts.Extensions;
+using SnowMaidenContracts.Infrastructure;
+
+namespace SnowMaidenContracts.DataModels;
+
+public class ProductHistoryDataModel(string productId, double oldPrice) : IValidation
+{
+	public string ProductId { get; private set; } = productId;
+
+	public double OldPrice { get; private set; } = oldPrice;
+
+	public DateTime ChangeDate { get; private set; } = DateTime.UtcNow;
+
+	public void Validate()
+	{
+		if (ProductId.IsEmpty())
+			throw new ValidationException("Field Product ID is empty");
+
+		if (!ProductId.IsGuid())
+			throw new ValidationException("The value is NOT a unique identifier");
+
+		if (OldPrice <= 0)
+			throw new ValidationException("Field OldPrice is less than or equal to 0");
+	}
+}

IcecreamVan/SnowMaidenContracts/DataModels/SalaryDataModel.cs

@@ -0,0 +1,26 @@
+using SnowMaidenContracts.Exceptions;
+using SnowMaidenContracts.Extensions;
+using SnowMaidenContracts.Infrastructure;
+
+namespace SnowMaidenContracts.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 Worker ID is empty");
+
+		if (!WorkerId.IsGuid())
+			throw new ValidationException("The Worker ID value is NOT a unique identifier");
+
+		if (Salary <= 0)
+			throw new ValidationException("Field Salary is less than or equal to 0");
+	}
+}

IcecreamVan/SnowMaidenContracts/DataModels/SaleDataModel.cs

@@ -0,0 +1,48 @@
+using SnowMaidenContracts.Enums;
+using SnowMaidenContracts.Exceptions;
+using SnowMaidenContracts.Extensions;
+using SnowMaidenContracts.Infrastructure;
+
+namespace SnowMaidenContracts.DataModels;
+
+// 2. Продажа, помимо работника, содержит клиента/покупателя (Buyer -> Sale) и СПИСОК ПРОДУКТОВ (3. SaleProduct -> Sale)
+
+public class SaleDataModel(string id, string workerId, 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 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 ID is not a unique identifier");
+
+		if (WorkerId.IsEmpty())
+			throw new ValidationException("Field Worker ID is empty");
+
+		if (!WorkerId.IsGuid())
+			throw new ValidationException("The Worker ID 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");
+	}
+}

IcecreamVan/SnowMaidenContracts/DataModels/SaleProductDataModel.cs

@@ -0,0 +1,34 @@
+using SnowMaidenContracts.Exceptions;
+using SnowMaidenContracts.Extensions;
+using SnowMaidenContracts.Infrastructure;
+
+namespace SnowMaidenContracts.DataModels;
+
+// 3. Каждый продукт связан с продажей промежуточной информацией о количестве данного продукта (4. Product -> SaleProduct)
+
+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 Sale ID is empty");
+
+		if (!SaleId.IsGuid())
+			throw new ValidationException("The Sale ID value is NOT a unique identifier");
+
+		if (ProductId.IsEmpty())
+			throw new ValidationException("Field Product ID is empty");
+
+		if (!ProductId.IsGuid())
+			throw new ValidationException("The Product ID value is NOT a unique identifier");
+
+		if (Count <= 0)
+			throw new ValidationException("Field Count is less than or equal to 0");
+	}
+}

IcecreamVan/SnowMaidenContracts/DataModels/WorkerDataModel.cs

@@ -0,0 +1,59 @@
+using System.Text.RegularExpressions;
+using SnowMaidenContracts.Exceptions;
+using SnowMaidenContracts.Extensions;
+using SnowMaidenContracts.Infrastructure;
+
+namespace SnowMaidenContracts.DataModels;
+
+// 1. Работник (Worker -> 2. Sale)  фигурирует затем в продажах,
+// имеет определенную должность (Post -> Worker), имеет отношение к зачислению з/п (Worker -> Salary)
+
+public class WorkerDataModel(string id, string fio, string postId, string phoneNumber, DateTime birthDate, DateTime employmentDate, bool isDeleted) : IValidation
+{
+	public string Id { get; private set; } = id;
+
+	public string FIO { get; private set; } = fio;
+
+    public string PhoneNumber { get; private set; } = phoneNumber;
+
+    public string PostId { get; private set; } = postId;
+
+	public DateTime BirthDate { get; private set; } = birthDate;
+
+	public DateTime EmploymentDate { get; private set; } = employmentDate;
+
+	public bool IsDeleted { get; private set; } = isDeleted;
+
+	public void Validate()
+	{
+		if (Id.IsEmpty())
+			throw new ValidationException("Field ID is empty");
+
+		if (!Id.IsGuid())
+			throw new ValidationException("The ID value is NOT a unique identifier");
+
+		if (FIO.IsEmpty())
+			throw new ValidationException("Field FIO is empty");
+
+		if (PostId.IsEmpty())
+			throw new ValidationException("Field Post ID is empty");
+
+		if (!PostId.IsGuid())
+			throw new ValidationException("The Post ID value is not a unique identifier");
+
+		if (BirthDate.Date > DateTime.Now.AddYears(-16).Date)
+			throw new ValidationException($"Minors cannot be hired (BirthDate = {BirthDate.ToShortDateString()})");
+
+		if (EmploymentDate.Date < BirthDate.Date)
+			throw new ValidationException("The date of employment cannot be less than the date of birth");
+
+		if ((EmploymentDate - BirthDate).TotalDays / 365 < 16) // EmploymentDate.Year - BirthDate.Year
+			throw new ValidationException($"Minors cannot be hired (EmploymentDate - {EmploymentDate.ToShortDateString()}, BirthDate - {BirthDate.ToShortDateString()})");
+
+        if (PhoneNumber.IsEmpty())
+            throw new ValidationException("Field PhoneNumber is empty");
+
+        if (!Regex.IsMatch(PhoneNumber, @"^(8|\+7)\(?\d{3}\)?[-.\s]?\d{3}[-.\s]?\d{2}[-.\s]?\d{2}")) // *
+            throw new ValidationException("Field PhoneNumber is NOT a phone number");
+    }
+}

IcecreamVan/SnowMaidenContracts/Enums/DiscountType.cs

@@ -0,0 +1,9 @@
+namespace SnowMaidenContracts.Enums;
+
+[Flags]
+public enum DiscountType
+{
+	None = 0,
+	OnSale = 1,
+	Certificate = 2
+}

IcecreamVan/SnowMaidenContracts/Enums/PostType.cs

@@ -0,0 +1,9 @@
+namespace SnowMaidenContracts.Enums;
+
+public enum PostType
+{
+	None = 0,
+	Chef = 1,
+	Cashier = 2,
+	Assistant = 3
+}

IcecreamVan/SnowMaidenContracts/Enums/ProductType.cs

@@ -0,0 +1,9 @@
+namespace SnowMaidenContracts.Enums;
+
+public enum ProductType
+{
+	None = 0,
+	Icecream = 1,
+	Milkshake = 2,
+	Souvenir = 3
+}

IcecreamVan/SnowMaidenContracts/Exceptions/ValidationException.cs

@@ -0,0 +1,78 @@
+namespace SnowMaidenContracts.Exceptions;
+
+/*
+
+Необходимо реализовать приложение для автоматизации работы 
+фургончика с мороженным «Снегурочка». В фургончике трудятся 
+работники на разных должностях, они отвечают за готовку,
+продажу, перемещение. Необходимо фиксировать продажи различного
+мороженного (разных типов от разных производителей). Предусмотреть
+возможность начисления ежемесячной зарплаты работникам на основе выполненных продаж.
+
+*/
+
+public class ValidationException(string message) : Exception(message)
+{
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+/*
+
+ Questions :
+ 1. Регулярные выражения (regex или regexp) -
+ последовательность символов, которая определяет шаблон поиска.
+ Используется при проверки соответствия строки определенному шаблону (например, проверка формата email-адреса).
+ Один из основных инструментов - Метасимволы.
+ Специальные символы, имеющие особое значение. Вот некоторые из наиболее распространенных:
+ .  Соответствует любому одиночному символу(кроме новой строки, если не указано иное).
+ ^  - началу строки.
+ $  - концу строки.
+ *  - нулю или более повторениям предыдущего символа или группы.
+ +  - одному или более повторениям предыдущего символа или группы.
+ ?  - нулю или одному повторению предыдущего символа или группы.
+ ([!] СМ. BuyerDataModel / WorkerDM [!])
+
+ Regex.Matches(text, pattern) - выполняет поиск всех соответствий шаблону pattern в тексте text.
+ MatchCollection - коллекция найденных соответствий.
+ match.Value - свойство объекта Match, содержащее найденную подстроку.
+
+
+ 2. В Solution Explorer -> Выбр. роект(щёлкнув), в который вы хотите добавить ссылку, Add -> Project Reference…
+ (или “Добавить” -> “Ссылка на проект…”). В открывшемся окне отметить проект, который хочу подключить
+ ВАЖНО : Не допускать циклических зависимостей + Убедиться, что подключаемые классы и методы,
+ для исп. в другом проекте, имеют модификатор доступа public / internal (по умолчанию)
+ делает их доступными только в пределах текущей сборки. 
+
+
+ 3. В C# тестирование обычно выполняется с использованием фреймворков, таких как MSTest, NUnit или xUnit.
+ Независимо от фреймворка, Visual Studio предоставляет удобный интерфейс для запуска тестов.
+
+ Запуск тестов через Test Explorer: Открыть Test Explorer: Test -> Windows -> Test Explorer (или Ctrl+E, T).
+ Иногда может потребоваться нажать кнопку “Refresh” в Test Explorer.
+ Щелкните правой кнопкой мыши по имени теста в Test Explorer и выберите “Run Selected Tests”
+(или “Запустить выбранные тесты”). Можно выбрать несколько тестов, удерживая Ctrl или Shift и щелкая по ним, а затем запустить их.
+
+*/

IcecreamVan/SnowMaidenContracts/Extensions/StringExtensions.cs

@@ -0,0 +1,14 @@
+namespace SnowMaidenContracts.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 _);
+	}
+}

IcecreamVan/SnowMaidenContracts/Infrastructure/IValidation.cs

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

IcecreamVanSnowMaiden.sln

@@ -0,0 +1,31 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.8.34525.116
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "IcecreamVan", "IcecreamVan\IcecreamVan.csproj", "{A0730374-6964-4D45-A425-049EAE498DEC}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Tests", "Tests\Tests.csproj", "{FC61899B-2BD9-43C9-AA66-6BF1A6FE2F48}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A0730374-6964-4D45-A425-049EAE498DEC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A0730374-6964-4D45-A425-049EAE498DEC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A0730374-6964-4D45-A425-049EAE498DEC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A0730374-6964-4D45-A425-049EAE498DEC}.Release|Any CPU.Build.0 = Release|Any CPU
+		{FC61899B-2BD9-43C9-AA66-6BF1A6FE2F48}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{FC61899B-2BD9-43C9-AA66-6BF1A6FE2F48}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{FC61899B-2BD9-43C9-AA66-6BF1A6FE2F48}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{FC61899B-2BD9-43C9-AA66-6BF1A6FE2F48}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {9B025B6B-EB5B-42BD-ABD4-4F16CF081CD4}
+	EndGlobalSection
+EndGlobal

Tests/SnowMaidenDMTests/ManufacturerDMTest.cs

@@ -0,0 +1,55 @@
+using NUnit.Framework;
+using SnowMaidenContracts.DataModels;
+using SnowMaidenContracts.Exceptions;
+
+namespace SnowMaidenTests.DataModelsTest;
+
+[TestFixture]
+internal class ManufacturerDMTest
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var manufacturer = CreateDataModel(null, "name");
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+        manufacturer = CreateDataModel(string.Empty, "name");
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var manufacturer = CreateDataModel("id", "name");
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ManufacturerNameIsNullOrEmptyTest()
+    {
+        var manufacturer = CreateDataModel(Guid.NewGuid().ToString(), null);
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+        manufacturer = CreateDataModel(Guid.NewGuid().ToString(), string.Empty);
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var manufacturerId = Guid.NewGuid().ToString();
+        var manufacturerName = "name";
+        var prevManufacturerName = "LastName";
+        var prevPrevManufacturerName = "EarlierName";
+        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);
+}

Tests/SnowMaidenDMTests/PostDMTest.cs

@@ -0,0 +1,94 @@
+using NUnit.Framework;
+using SnowMaidenContracts.Enums;
+using SnowMaidenContracts.DataModels;
+using SnowMaidenContracts.Exceptions;
+
+namespace SnowMaidenTests.DataModelsTest;
+
+[TestFixture]
+internal class PostDMTest
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var post = CreateDataModel(null, Guid.NewGuid().ToString(), "name", PostType.Assistant, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), "name", PostType.Assistant, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var post = CreateDataModel("id", Guid.NewGuid().ToString(), "name", PostType.Assistant, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostIdIsNullEmptyTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), null, "name", PostType.Assistant, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, "name", PostType.Assistant, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostIdIsNotGuidTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), "postId", "name", PostType.Assistant, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostNameIsEmptyTest()
+    {
+        var manufacturer = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), null, PostType.Assistant, 10, true, DateTime.UtcNow);
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+        manufacturer = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), string.Empty, PostType.Assistant, 10, true, DateTime.UtcNow);
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostTypeIsNoneTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name", PostType.None, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void SalaryIsLessOrZeroTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name", PostType.Assistant, 0, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name", PostType.Assistant, -10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var postId = Guid.NewGuid().ToString();
+        var postPostId = Guid.NewGuid().ToString();
+        var postName = "name";
+        var postType = PostType.Assistant;
+        var salary = 10;
+        var isActual = false;
+        var changeDate = DateTime.UtcNow.AddDays(-1);
+        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);
+}

Tests/SnowMaidenDMTests/ProductDMTest.cs

@@ -0,0 +1,91 @@
+using NUnit.Framework;
+using SnowMaidenContracts.Enums;
+using SnowMaidenContracts.DataModels;
+using SnowMaidenContracts.Exceptions;
+
+namespace SnowMaidenTests.DataModelsTest;
+
+[TestFixture]
+internal class ProductDMTest
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var product = CreateDataModel(null, "name", ProductType.Souvenir, 10, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(string.Empty, "name", ProductType.Souvenir, 10, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var product = CreateDataModel("id", "name", ProductType.Souvenir, 10, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ProductNameIsEmptyTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), null, ProductType.Souvenir, 10, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, ProductType.Souvenir, 10, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ProductTypeIsNoneTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), null, ProductType.None, 10, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ManufacturerIdIsNullOrEmptyTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), null, ProductType.Souvenir, 10, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, ProductType.Souvenir, 10, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ManufacturerIdIsNotGuidTest()
+    {
+        var product = CreateDataModel("Mid", "name", ProductType.Souvenir, 10, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PriceIsLessOrZeroTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), "name", ProductType.Souvenir, 0, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(Guid.NewGuid().ToString(), "name", ProductType.Souvenir, -10, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var productId = Guid.NewGuid().ToString();
+        var productName = "name";
+        var productType = ProductType.Souvenir;
+        var productManufacturerId = Guid.NewGuid().ToString();
+        var productPrice = 10;
+        var productIsDelete = false;
+        var product = CreateDataModel(productId, productName, productType, productPrice, productIsDelete);
+        Assert.That(() => product.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(product.Id, Is.EqualTo(productId));
+            Assert.That(product.ProductName, Is.EqualTo(productName));
+            Assert.That(product.ProductType, Is.EqualTo(productType));
+            Assert.That(product.Price, Is.EqualTo(productPrice));
+            Assert.That(product.IsDeleted, Is.EqualTo(productIsDelete));
+        });
+    }
+
+    private static ProductDataModel CreateDataModel(string? id, string? productName, ProductType productType, double price, bool isDeleted) =>
+        new(id, productName, productType, price, isDeleted);
+}

Tests/SnowMaidenDMTests/ProductHistoryDMTest.cs

@@ -0,0 +1,53 @@
+using NUnit.Framework;
+using SnowMaidenContracts.DataModels;
+using SnowMaidenContracts.Exceptions;
+
+namespace SnowMaidenTests.DataModelsTest;
+
+[TestFixture]
+internal class ProductHistoryDMTest
+{
+    [Test]
+    public void ProductIdIsNullOrEmptyTest()
+    {
+        var product = CreateDataModel(null, 10);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(string.Empty, 10);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ProductIdIsNotGuidTest()
+    {
+        var product = CreateDataModel("id", 10);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void OldPriceIsLessOrZeroTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), 0);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(Guid.NewGuid().ToString(), -10);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var productId = Guid.NewGuid().ToString();
+        var oldPrice = 10;
+        var productHistory = CreateDataModel(productId, oldPrice);
+        Assert.That(() => productHistory.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(productHistory.ProductId, Is.EqualTo(productId));
+            Assert.That(productHistory.OldPrice, Is.EqualTo(oldPrice));
+            Assert.That(productHistory.ChangeDate, Is.LessThan(DateTime.UtcNow));
+            Assert.That(productHistory.ChangeDate, Is.GreaterThan(DateTime.UtcNow.AddMinutes(-1)));
+        });
+    }
+
+    private static ProductHistoryDataModel CreateDataModel(string productId, double oldPrice) =>
+        new(productId, oldPrice);
+}

Tests/SnowMaidenDMTests/SalaryDMTest.cs

@@ -0,0 +1,53 @@
+using NUnit.Framework;
+using SnowMaidenContracts.DataModels;
+using SnowMaidenContracts.Exceptions;
+
+namespace SnowMaidenTests.DataModelsTest;
+
+[TestFixture]
+internal class SalaryDMTest
+{
+    [Test]
+    public void WorkerIdIsEmptyTest()
+    {
+        var salary = CreateDataModel(null, DateTime.Now, 10);
+        Assert.That(() => salary.Validate(), Throws.TypeOf<ValidationException>());
+        salary = CreateDataModel(string.Empty, DateTime.Now, 10);
+        Assert.That(() => salary.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void WorkerIdIsNotGuidTest()
+    {
+        var salary = CreateDataModel("workerId", DateTime.Now, 10);
+        Assert.That(() => salary.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PriceIsLessOrZeroTest()
+    {
+        var salary = CreateDataModel(Guid.NewGuid().ToString(), DateTime.Now, 0);
+        Assert.That(() => salary.Validate(), Throws.TypeOf<ValidationException>());
+        salary = CreateDataModel(Guid.NewGuid().ToString(), DateTime.Now, -10);
+        Assert.That(() => salary.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var workerId = Guid.NewGuid().ToString();
+        var salaryDate = DateTime.Now.AddDays(-3).AddMinutes(-5);
+        var workerSalary = 10;
+        var salary = CreateDataModel(workerId, salaryDate, workerSalary);
+        Assert.That(() => salary.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(salary.WorkerId, Is.EqualTo(workerId));
+            Assert.That(salary.SalaryDate, Is.EqualTo(salaryDate));
+            Assert.That(salary.Salary, Is.EqualTo(workerSalary));
+        });
+    }
+
+    private static SalaryDataModel CreateDataModel(string? workerId, DateTime salaryDate, double workerSalary) =>
+        new(workerId, salaryDate, workerSalary);
+}

Tests/SnowMaidenDMTests/SaleDMTest.cs

@@ -0,0 +1,88 @@
+using NUnit.Framework;
+using SnowMaidenContracts.Enums;
+using SnowMaidenContracts.DataModels;
+using SnowMaidenContracts.Exceptions;
+
+[TestFixture]
+internal class SaleDMTest
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(null, Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var sale = CreateDataModel("id", Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void WorkerIdIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), null, 10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, 10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void WorkerIdIsNotGuidTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), "workerId", 10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void SumIsLessOrZeroTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 0, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), -10, DiscountType.OnSale, 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ProductsIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false, null);
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false, []);
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var saleId = Guid.NewGuid().ToString();
+        var workerId = Guid.NewGuid().ToString();
+        var buyerId = Guid.NewGuid().ToString();
+        var sum = 10;
+        var discountType = DiscountType.Certificate;
+        var discount = 1;
+        var isCancel = true;
+        var products = CreateSubDataModel();
+        var sale = CreateDataModel(saleId, workerId, sum, discountType, discount, isCancel, products);
+        Assert.That(() => sale.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(sale.Id, Is.EqualTo(saleId));
+            Assert.That(sale.WorkerId, Is.EqualTo(workerId));
+            Assert.That(sale.Sum, Is.EqualTo(sum));
+            Assert.That(sale.DiscountType, Is.EqualTo(discountType));
+            Assert.That(sale.Discount, Is.EqualTo(discount));
+            Assert.That(sale.IsCancel, Is.EqualTo(isCancel));
+            Assert.That(sale.Products, Is.EquivalentTo(products));
+        });
+    }
+
+    private static SaleDataModel CreateDataModel(string? id, string? workerId, double sum, DiscountType discountType, double discount, bool isCancel, List<SaleProductDataModel>? products) =>
+        new(id, workerId, sum, discountType, discount, isCancel, products);
+
+    private static List<SaleProductDataModel> CreateSubDataModel()
+        => [new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 1)];
+}

Tests/SnowMaidenDMTests/SaleProductDMTest.cs

@@ -0,0 +1,69 @@
+using NUnit.Framework;
+using SnowMaidenContracts.DataModels;
+using SnowMaidenContracts.Exceptions;
+
+namespace SnowMaidenTests.DataModelsTest;
+
+[TestFixture]
+internal class SaleProductDMTest
+{
+    [Test]
+    public void SaleIdIsNullOrEmptyTest()
+    {
+        var saleProduct = CreateDataModel(null, Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleProduct.Validate(), Throws.TypeOf<ValidationException>());
+        saleProduct = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleProduct.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void SaleIdIsNotGuidTest()
+    {
+        var saleProduct = CreateDataModel("saleId", Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleProduct.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ProductIdIsNullOrEmptyTest()
+    {
+        var saleProduct = CreateDataModel(Guid.NewGuid().ToString(), null, 10);
+        Assert.That(() => saleProduct.Validate(), Throws.TypeOf<ValidationException>());
+        saleProduct = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleProduct.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ProductIdIsNotGuidTest()
+    {
+        var saleProduct = CreateDataModel(Guid.NewGuid().ToString(), "productId", 10);
+        Assert.That(() => saleProduct.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void CountIsLessOrZeroTest()
+    {
+        var saleProduct = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 0);
+        Assert.That(() => saleProduct.Validate(), Throws.TypeOf<ValidationException>());
+        saleProduct = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), -10);
+        Assert.That(() => saleProduct.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var saleId = Guid.NewGuid().ToString();
+        var productId = Guid.NewGuid().ToString();
+        var count = 10;
+        var saleProduct = CreateDataModel(saleId, productId, count);
+        Assert.That(() => saleProduct.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(saleProduct.SaleId, Is.EqualTo(saleId));
+            Assert.That(saleProduct.ProductId, Is.EqualTo(productId));
+            Assert.That(saleProduct.Count, Is.EqualTo(count));
+        });
+    }
+
+    private static SaleProductDataModel CreateDataModel(string? saleId, string? productId, int count) =>
+        new(saleId, productId, count);
+}

Tests/SnowMaidenDMTests/WorkerDMTest.cs

@@ -0,0 +1,110 @@
+using System;
+using NUnit.Framework;
+using SnowMaidenContracts.DataModels;
+using SnowMaidenContracts.Exceptions;
+
+namespace SnowMaidenTests.DataModelsTest;
+
+[TestFixture]
+internal class WorkerDMTest
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var worker = CreateDataModel(null, "FIO", Guid.NewGuid().ToString(), "number", DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+        worker = CreateDataModel(string.Empty, "FIO", Guid.NewGuid().ToString(), "number", 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(), "number", 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(), "number", DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+        worker = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, Guid.NewGuid().ToString(), "number", 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, "number", DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+        worker = CreateDataModel(Guid.NewGuid().ToString(), "FIO", string.Empty, "number", DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PhoneNumberIsNullOrEmptyTest()
+    {
+        var buyer = CreateDataModel(Guid.NewGuid().ToString(), "FIO", Guid.NewGuid().ToString(), null, DateTime.Now.AddYears(-16).AddDays(1), DateTime.Now, false);
+        Assert.That(() => buyer.Validate(), Throws.TypeOf<ValidationException>());
+        buyer = CreateDataModel(Guid.NewGuid().ToString(), "FIO", Guid.NewGuid().ToString(), string.Empty, DateTime.Now.AddYears(-16).AddDays(1), DateTime.Now, false);
+        Assert.That(() => buyer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PhoneNumberIsIncorrectTest()
+    {
+        var buyer = CreateDataModel(Guid.NewGuid().ToString(), "FIO", Guid.NewGuid().ToString(), "777", DateTime.Now.AddYears(-16).AddDays(1), DateTime.Now, false);
+        Assert.That(() => buyer.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostIdIsNotGuidTest()
+    {
+        var worker = CreateDataModel(Guid.NewGuid().ToString(), "FIO", "postId", "number", 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(), "number", 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(), "number", 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(), "number", DateTime.Now.AddYears(-18), DateTime.Now.AddYears(-16), false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var workerId = Guid.NewGuid().ToString();
+        var fio = "FIO";
+        var postId = Guid.NewGuid().ToString();
+        var phoneNumber = "+7(903)123-45-67";
+        var birthDate = DateTime.Now.AddYears(-16).AddDays(-1);
+        var employmentDate = DateTime.Now;
+        var isDelete = false;
+        var worker = CreateDataModel(workerId, fio, postId, phoneNumber, 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.PhoneNumber, Is.EqualTo(phoneNumber));
+            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, string? number, DateTime birthDate, DateTime employmentDate, bool isDeleted) =>
+        new(id, fio, postId, number, birthDate, employmentDate, isDeleted);
+}

Tests/Tests.csproj

@@ -0,0 +1,24 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.6.0" />
+    <PackageReference Include="NUnit" Version="3.13.3" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.2.1" />
+    <PackageReference Include="NUnit.Analyzers" Version="3.6.1" />
+    <PackageReference Include="coverlet.collector" Version="6.0.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\IcecreamVan\IcecreamVan.csproj" />
+  </ItemGroup>
+
+</Project>