10 changed files with 558 additions and 2 deletions
--- a/SPiluSZharuProject/SPiluSZharuContracts/DataModels/PostDataModel.cs
+++ b/SPiluSZharuProject/SPiluSZharuContracts/DataModels/PostDataModel.cs
@ -5,7 +5,7 @@ using SPiluSZharuContracts.Infrastructure;

 namespace SPiluSZharuContracts.DataModels;

-internal class PostDataModel(string id, string postId, string postName, PostType postType, double salary, bool isActual, DateTime changeDate) : IValidation
+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;

--- a/SPiluSZharuProject/SPiluSZharuProject.sln
+++ b/SPiluSZharuProject/SPiluSZharuProject.sln
@ -1,10 +1,12 @@

 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
-VisualStudioVersion = 17.12.35707.178 d17.12
+VisualStudioVersion = 17.12.35707.178
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SPiluSZharuContracts", "SPiluSZharuContracts\SPiluSZharuContracts.csproj", "{BE7E0C12-A92F-42D7-92CD-7217D1397582}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SPiluSZharuTests", "SPiluSZharuTests\SPiluSZharuTests.csproj", "{32A3EE3B-0EA9-4F4C-AA60-E90E3C563D61}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@ -15,6 +17,10 @@ Global
 		{BE7E0C12-A92F-42D7-92CD-7217D1397582}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{BE7E0C12-A92F-42D7-92CD-7217D1397582}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{BE7E0C12-A92F-42D7-92CD-7217D1397582}.Release|Any CPU.Build.0 = Release|Any CPU
+		{32A3EE3B-0EA9-4F4C-AA60-E90E3C563D61}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{32A3EE3B-0EA9-4F4C-AA60-E90E3C563D61}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{32A3EE3B-0EA9-4F4C-AA60-E90E3C563D61}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{32A3EE3B-0EA9-4F4C-AA60-E90E3C563D61}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
--- a/SPiluSZharuProject/SPiluSZharuTests/DataModelTests/PostDataModelTests.cs
+++ b/SPiluSZharuProject/SPiluSZharuTests/DataModelTests/PostDataModelTests.cs
@ -0,0 +1,93 @@
+using SPiluSZharuContracts.DataModels;
+using SPiluSZharuContracts.Exceptions;
+using SPiluSZharuContracts.Enums;
+
+namespace SPiluSZharuTests.DataModelTests;
+
+[TestFixture]
+internal class PostDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var post = CreateDataModel(null, Guid.NewGuid().ToString(), "name", PostType.Operator, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), "name", PostType.Operator, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var post = CreateDataModel("id", Guid.NewGuid().ToString(), "name", PostType.Operator, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostIdIsNullEmptyTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), null, "name", PostType.Operator, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, "name", PostType.Operator, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostIdIsNotGuidTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), "postId", "name", PostType.Operator, 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.Operator, 10, true, DateTime.UtcNow);
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+        manufacturer = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), string.Empty, PostType.Operator, 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.Operator, 0, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name", PostType.Operator, -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.Operator;
+        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);
+}
--- a/SPiluSZharuProject/SPiluSZharuTests/DataModelTests/ProductDataModelTests.cs
+++ b/SPiluSZharuProject/SPiluSZharuTests/DataModelTests/ProductDataModelTests.cs
@ -0,0 +1,73 @@
+using SPiluSZharuContracts.DataModels;
+using SPiluSZharuContracts.Exceptions;
+using SPiluSZharuContracts.Enums;
+
+namespace SPiluSZharuTests.DataModelTests;
+
+[TestFixture]
+internal class ProductDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var product = CreateDataModel(null, "name", ProductType.Pizza, 500, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(string.Empty, "name", ProductType.Pizza, 500, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var product = CreateDataModel("id", "name", ProductType.Pizza, 500, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ProductNameIsNullOrEmptyTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), null, ProductType.Pizza, 500, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, ProductType.Pizza, 500, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ProductTypeIsNoneTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), null, ProductType.None, 0, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PriceIsLessOrZeroTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), null, ProductType.Pizza, 0, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, ProductType.Pizza, -500, false);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var productId = Guid.NewGuid().ToString();
+        var productName = "name";
+        var productType = ProductType.Pizza;
+        var price = 500;
+        var productIsDeleted = false;
+        var product = CreateDataModel(productId, productName, productType, price, productIsDeleted);
+        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(price));
+            Assert.That(product.IsDeleted, Is.EqualTo(productIsDeleted));
+        });
+    }
+
+    private static ProductDataModel CreateDataModel(string? id, string? productName, ProductType productType, double price, bool isDeleted) =>
+       new(id, productName, productType, price, isDeleted);
+}
--- a/SPiluSZharuProject/SPiluSZharuTests/DataModelTests/ProductHistoryDataModelTests.cs
+++ b/SPiluSZharuProject/SPiluSZharuTests/DataModelTests/ProductHistoryDataModelTests.cs
@ -0,0 +1,52 @@
+using SPiluSZharuContracts.DataModels;
+using SPiluSZharuContracts.Exceptions;
+
+namespace SPiluSZharuTests.DataModelTests;
+
+[TestFixture]
+internal class ProductHistoryDataModelTests
+{
+    [Test]
+    public void ProductIdIsNullOrEmptyTest()
+    {
+        var product = CreateDataModel(null, 500);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(string.Empty, 500);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ProductIdIsNotGuidTest()
+    {
+        var product = CreateDataModel("id", 500);
+        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(), -500);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var productId = Guid.NewGuid().ToString();
+        var oldPrice = 500;
+        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);
+}
--- a/SPiluSZharuProject/SPiluSZharuTests/DataModelTests/RestaurantDataModelTests.cs
+++ b/SPiluSZharuProject/SPiluSZharuTests/DataModelTests/RestaurantDataModelTests.cs
@ -0,0 +1,54 @@
+using SPiluSZharuContracts.DataModels;
+using SPiluSZharuContracts.Exceptions;
+
+namespace SPiluSZharuTests.DataModelTests;
+
+[TestFixture]
+internal class RestaurantDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var restaurant = CreateDataModel(null, "name");
+        Assert.That(() => restaurant.Validate(), Throws.TypeOf<ValidationException>());
+        restaurant = CreateDataModel(string.Empty, "name");
+        Assert.That(() => restaurant.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void RestaurantIdIsNotGuidTest()
+    {
+        var restaurant = CreateDataModel("id", "name");
+        Assert.That(() => restaurant.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void RestaurantNameIsNullOrEmptyTest()
+    {
+        var restaurant = CreateDataModel(Guid.NewGuid().ToString(), null);
+        Assert.That(() => restaurant.Validate(), Throws.TypeOf<ValidationException>());
+        restaurant = CreateDataModel(Guid.NewGuid().ToString(), string.Empty);
+        Assert.That(() => restaurant.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var restaurantId = Guid.NewGuid().ToString();
+        var restaurantName = "name";
+        var prevRestaurantName = "prevRestaurantName";
+        var prevPrevRestaurantName = "prevPrevRestaurantName";
+        var restaurant = CreateDataModel(restaurantId, restaurantName, prevRestaurantName, prevPrevRestaurantName);
+        Assert.That(() => restaurant.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(restaurant.Id, Is.EqualTo(restaurantId));
+            Assert.That(restaurant.RestaurantName, Is.EqualTo(restaurantName));
+            Assert.That(restaurant.PrevRestaurantName, Is.EqualTo(prevRestaurantName));
+            Assert.That(restaurant.PrevPrevRestaurantName, Is.EqualTo(prevPrevRestaurantName));
+        });
+    }
+
+    private static RestaurantDataModel CreateDataModel(string? Id, string? restaurantName, string? prevRestaurantName = null, string? prevPrevRestaurantName = null) =>
+      new(Id, restaurantName, prevRestaurantName, prevPrevRestaurantName);
+}
--- a/SPiluSZharuProject/SPiluSZharuTests/DataModelTests/SaleDataModelTests.cs
+++ b/SPiluSZharuProject/SPiluSZharuTests/DataModelTests/SaleDataModelTests.cs
@ -0,0 +1,93 @@
+using SPiluSZharuContracts.DataModels;
+using SPiluSZharuContracts.Exceptions;
+
+namespace SPiluSZharuTests.DataModelTests;
+
+[TestFixture]
+internal class SaleDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(null, Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var sale = CreateDataModel("id", Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void WorkerIdIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), null, Guid.NewGuid().ToString(), 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, Guid.NewGuid().ToString(), 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void WorkerIdIsNotGuidTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), "employeeId", Guid.NewGuid().ToString(), 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void RestaurantIdIsNotGuidTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "restaurantId", 10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void SumIsLessOrZeroTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 0, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), -10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ProductsIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, false, null);
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 10, false, []);
+        Assert.That(() => sale.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var saleId = Guid.NewGuid().ToString();
+        var workerId = Guid.NewGuid().ToString();
+        var restaurantId = Guid.NewGuid().ToString();
+        var sum = 10;
+        var isCancel = true;
+        var products = CreateSubDataModel();
+        var sale = CreateDataModel(saleId, workerId, restaurantId, sum, 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.RestaurantId, Is.EqualTo(restaurantId));
+            Assert.That(sale.Sum, Is.EqualTo(sum));
+            Assert.That(sale.IsCancel, Is.EqualTo(isCancel));
+            Assert.That(sale.Products, Is.EquivalentTo(products));
+        });
+    }
+
+    private static SaleDataModel CreateDataModel(string? id, string? workerId, string? restaurantId, double sum, bool isCancel, List<SaleProductDataModel>? products) =>
+    new(id, workerId, restaurantId, sum, isCancel, products);
+
+    private static List<SaleProductDataModel> CreateSubDataModel()
+        => [new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 1)];
+}
--- a/SPiluSZharuProject/SPiluSZharuTests/DataModelTests/SaleProductDataModelTests.cs
+++ b/SPiluSZharuProject/SPiluSZharuTests/DataModelTests/SaleProductDataModelTests.cs
@ -0,0 +1,68 @@
+using SPiluSZharuContracts.DataModels;
+using SPiluSZharuContracts.Exceptions;
+
+namespace SPiluSZharuTests.DataModelTests;
+
+[TestFixture]
+internal class SaleProductDataModelTests
+{
+    [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);
+}
--- a/SPiluSZharuProject/SPiluSZharuTests/DataModelTests/WorkerDataModelTests.cs
+++ b/SPiluSZharuProject/SPiluSZharuTests/DataModelTests/WorkerDataModelTests.cs
@ -0,0 +1,90 @@
+using SPiluSZharuContracts.DataModels;
+using SPiluSZharuContracts.Exceptions;
+
+namespace SPiluSZharuTests.DataModelTests;
+
+[TestFixture]
+internal class WorkerDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var worker = CreateDataModel(null, "fio", Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16), 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(-16), 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(-16), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+        worker = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16), 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(-16), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+        worker = CreateDataModel(Guid.NewGuid().ToString(), "fio", string.Empty, DateTime.Now.AddYears(-16), 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(-16), 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(-16), DateTime.Now.AddYears(-16).AddDays(-1), false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+        worker = CreateDataModel(Guid.NewGuid().ToString(), "fio", Guid.NewGuid().ToString(), DateTime.Now.AddYears(-16), DateTime.Now.AddYears(-14), 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 birthDate = DateTime.Now.AddYears(-16).AddDays(-1);
+        var employmentDate = DateTime.Now;
+        var isDelete = false;
+        var worker = CreateDataModel(workerId, fio, postId, birthDate, employmentDate, isDelete);
+        Assert.That(() => worker.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(worker.Id, Is.EqualTo(workerId));
+            Assert.That(worker.FIO, Is.EqualTo(fio));
+            Assert.That(worker.PostId, Is.EqualTo(postId));
+            Assert.That(worker.BirthDate, Is.EqualTo(birthDate));
+            Assert.That(worker.EmploymentDate, Is.EqualTo(employmentDate));
+            Assert.That(worker.IsDeleted, Is.EqualTo(isDelete));
+        });
+    }
+
+    private static WorkerDataModel CreateDataModel(string? id, string? fio, string? postId, DateTime birthDate, DateTime employmentDate, bool isDeleted) =>
+        new(id, fio, postId, birthDate, employmentDate, isDeleted);
+}
--- a/SPiluSZharuProject/SPiluSZharuTests/SPiluSZharuTests.csproj
+++ b/SPiluSZharuProject/SPiluSZharuTests/SPiluSZharuTests.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="..\SPiluSZharuContracts\SPiluSZharuContracts.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="NUnit.Framework" />
+  </ItemGroup>
+
+</Project>