dd

AndDietCoke/AndDietCoke.sln

@@ -1,10 +1,12 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
-VisualStudioVersion = 17.13.35507.96 d17.13
+VisualStudioVersion = 17.13.35507.96
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AndDietCokeContract", "AndDietCokeContract\AndDietCokeContract.csproj", "{7B2E436C-9A9F-4167-8C80-850154523E50}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AndDietCokeTests", "TestProject2\AndDietCokeTests.csproj", "{96C08AAB-3C1B-4BD7-BB10-4908E2E6140E}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -15,6 +17,10 @@ Global
 		{7B2E436C-9A9F-4167-8C80-850154523E50}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{7B2E436C-9A9F-4167-8C80-850154523E50}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{7B2E436C-9A9F-4167-8C80-850154523E50}.Release|Any CPU.Build.0 = Release|Any CPU
+		{96C08AAB-3C1B-4BD7-BB10-4908E2E6140E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{96C08AAB-3C1B-4BD7-BB10-4908E2E6140E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{96C08AAB-3C1B-4BD7-BB10-4908E2E6140E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{96C08AAB-3C1B-4BD7-BB10-4908E2E6140E}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

AndDietCoke/AndDietCokeContract/DataModels/BuyerDataModel.cs

@@ -0,0 +1,36 @@
+using AndDietCokeContract.Extensions;
+using AndDietCokeContract.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Numerics;
+using System.Text;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using static System.Runtime.InteropServices.JavaScript.JSType;
+using System.Xml;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeContract.DataModels;
+
+public class BuyerDataModel(string id, string name, string phoneNumber, double
+discount) : IValidation
+{
+    public string Id { get; private set; } = id;
+    public string Name { get; private set; } = name;
+    public string PhoneNumber { get; private set; } = phoneNumber;
+    public double Discount { get; private set; } = discount;
+    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 (Name.IsEmpty())
+            throw new ValidationException("Field Name is empty");
+        if (PhoneNumber.IsEmpty())
+            throw new ValidationException("Field PhoneNumber is empty");
+        if (!Regex.IsMatch(PhoneNumber, @"^((8|\+7)[\- ]?)?(\(?\d{3}\)?[\- ]?)?[\d\- ]{7,10}$"))
+            throw new ValidationException("Field PhoneNumber is not a phone number");
+    }
+}

AndDietCoke/AndDietCokeContract/DataModels/DishDataModel.cs

@@ -0,0 +1,35 @@
+using AndDietCokeContract.Enums;
+using AndDietCokeContract.Exceptions;
+using AndDietCokeContract.Extensions;
+using AndDietCokeContract.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml;
+
+namespace AndDietCokeContract.DataModels;
+
+public class DishDataModel(string id, string dishName, DishType
+dishType, double price, bool isDeleted) : IValidation
+{
+    public string Id { get; private set; } = id;
+    public string DishName { get; private set; } = dishName;
+    public DishType DishType { get; private set; } = dishType;
+    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 (DishName.IsEmpty())
+            throw new ValidationException("Field DishName is empty");
+        if (DishType == DishType.None)
+            throw new ValidationException("Field DishType is empty"); 
+        if (Price <= 0)
+            throw new ValidationException("Field Price is less than or equal to 0");
+    }
+}

AndDietCoke/AndDietCokeContract/DataModels/DishHistoryDataModel.cs

@@ -0,0 +1,27 @@
+using AndDietCokeContract.Exceptions;
+using AndDietCokeContract.Extensions;
+using AndDietCokeContract.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AndDietCokeContract.DataModels;
+
+public class DishHistoryDataModel(string dishId, double oldPrice) :
+IValidation
+{
+    public string DishId { get; private set; } = dishId;
+    public double OldPrice { get; private set; } = oldPrice;
+    public DateTime ChangeDate { get; private set; } = DateTime.UtcNow;
+    public void Validate()
+    {
+        if (DishId.IsEmpty())
+            throw new ValidationException("Field DishId is empty");
+        if (!DishId.IsGuid())
+            throw new ValidationException("The value in the field DishId is not a unique identifier");
+        if (OldPrice <= 0)
+            throw new ValidationException("Field OldPrice is less than or equal to 0");
+    }
+}

AndDietCoke/AndDietCokeContract/DataModels/PostDataModel.cs

@@ -0,0 +1,41 @@
+using AndDietCokeContract.Enums;
+using AndDietCokeContract.Exceptions;
+using AndDietCokeContract.Extensions;
+using AndDietCokeContract.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml;
+
+namespace AndDietCokeContract.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 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 PostType is empty");
+        if (Salary <= 0)
+            throw new ValidationException("Field Salary is empty");
+    }
+}

AndDietCoke/AndDietCokeContract/DataModels/SalaryDataModel.cs

@@ -0,0 +1,27 @@
+using AndDietCokeContract.Exceptions;
+using AndDietCokeContract.Extensions;
+using AndDietCokeContract.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AndDietCokeContract.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 orequal to 0");
+    }
+}

AndDietCoke/AndDietCokeContract/DataModels/SaleDataModel.cs

@@ -0,0 +1,44 @@
+using AndDietCokeContract.Enums;
+using AndDietCokeContract.Exceptions;
+using AndDietCokeContract.Extensions;
+using AndDietCokeContract.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Xml;
+
+namespace AndDietCokeContract.DataModels;
+
+public class SaleDataModel(string id, string workerId, string? buyerId, double
+sum, DiscountType discountType, double discount, bool isCancel,
+List<SaleDishDataModel> dishes) : IValidation
+{
+    public string Id { get; private set; } = id;
+    public string WorkerId { get; private set; } = workerId;
+    public string? BuyerId { get; private set; } = buyerId;
+    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<SaleDishDataModel> Dishes { get; private set; } = dishes;
+    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 (!BuyerId?.IsGuid() ?? !BuyerId?.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 ((Dishes?.Count ?? 0) == 0)
+            throw new ValidationException("The sale must include dishes");
+    }
+}

AndDietCoke/AndDietCokeContract/DataModels/SaleDishDataModel.cs

@@ -0,0 +1,31 @@
+using AndDietCokeContract.Exceptions;
+using AndDietCokeContract.Extensions;
+using AndDietCokeContract.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AndDietCokeContract.DataModels;
+
+public class SaleDishDataModel(string saleId, string dishId, int count) :
+IValidation
+{
+    public string SaleId { get; private set; } = saleId;
+    public string DishId { get; private set; } = dishId; 
+    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 (DishId.IsEmpty())
+            throw new ValidationException("Field DishId is empty");
+        if (!DishId.IsGuid())
+            throw new ValidationException("The value in the field DishId is not a unique identifier");
+        if (Count <= 0)
+            throw new ValidationException("Field Count is less than or equal to 0");
+    }
+}

AndDietCoke/AndDietCokeContract/DataModels/WorkerDataModel.cs

@@ -0,0 +1,43 @@
+using AndDietCokeContract.Extensions;
+using AndDietCokeContract.Infrastructure;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using static System.Runtime.InteropServices.JavaScript.JSType;
+using System.Xml;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeContract.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;
+    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($"Minors cannot be hired (BirthDate = { BirthDate.ToShortDateString() })");
+        if (EmploymentDate.Date < BirthDate.Date)
+            throw new ValidationException("The date of employment cannot be less than the date of birth");
+        if ((EmploymentDate - BirthDate).TotalDays / 365 < 16) //EmploymentDate.Year - BirthDate.Year 
+            throw new ValidationException($"Minors cannot be hired (EmploymentDate - { EmploymentDate.ToShortDateString() }, BirthDate - { BirthDate.ToShortDateString()})");
+  
+    }
+}

AndDietCoke/AndDietCokeContract/Enums/BonusesType.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AndDietCokeContract.Enums;
+
+[Flags]
+public enum DiscountType
+{
+    None = 0,
+    OnSale = 1,
+    RegularCustomer = 2,
+    Certificate = 4
+}

AndDietCoke/AndDietCokeContract/Enums/DishType.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AndDietCokeContract.Enums;
+
+public enum DishType
+{
+    None = 0,
+    Pizza = 1,
+    Drink = 2,
+    Snack = 3
+}

AndDietCoke/AndDietCokeContract/Enums/PostType.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AndDietCokeContract.Enums;
+
+public enum PostType
+{
+    None = 0,
+    Cook = 1,
+    Cashier = 2,
+    DeliveryMan = 3
+}

AndDietCoke/AndDietCokeContract/Exceptions/ValidationException.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AndDietCokeContract.Exceptions;
+
+public class ValidationException(string message) : Exception(message)
+{
+
+}

AndDietCoke/AndDietCokeContract/Extensions/StringExtensions.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AndDietCokeContract.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 _);
+    }
+}

AndDietCoke/AndDietCokeContract/Infrastructure/IValidation.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace AndDietCokeContract.Infrastructure;
+
+public interface IValidation
+{
+    void Validate();
+}

AndDietCoke/AndDietCokeTests/AndDietCokeTests.csproj

@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.1" />
+    <PackageReference Include="NUnit" Version="3.13.3" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.4.2" />
+    <PackageReference Include="NUnit.Analyzers" Version="3.6.1" />
+    <PackageReference Include="coverlet.collector" Version="3.2.0" />
+  </ItemGroup>
+
+</Project>

AndDietCoke/AndDietCokeTests/DataModelsTests/BuyerDataModelTests.cs

@@ -0,0 +1,84 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class BuyerDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var buyer = CreateDataModel(null, "name", "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        buyer = CreateDataModel(string.Empty, "name", "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var buyer = CreateDataModel("id", "name", "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void NameIsNullOrEmptyTest()
+    {
+        var buyer = CreateDataModel(Guid.NewGuid().ToString(), null,
+        "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        buyer = CreateDataModel(Guid.NewGuid().ToString(), string.Empty,
+        "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PhoneNumberIsNullOrEmptyTest()
+    {
+        var buyer = CreateDataModel(Guid.NewGuid().ToString(), "name", null,
+        10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        buyer = CreateDataModel(Guid.NewGuid().ToString(), "name",
+        string.Empty, 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PhoneNumberIsIncorrectTest()
+    {
+        var buyer = CreateDataModel(Guid.NewGuid().ToString(), "name", "777",
+        10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var buyerId = Guid.NewGuid().ToString();
+        var name = "name";
+        var phoneNumber = "+7-777-777-77-77";
+        var discount = 11;
+        var buyer = CreateDataModel(buyerId, name, phoneNumber, discount);
+        Assert.That(() => buyer.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(buyer.Id, Is.EqualTo(buyerId));
+            Assert.That(buyer.Name, Is.EqualTo(name));
+            Assert.That(buyer.PhoneNumber, Is.EqualTo(phoneNumber));
+            Assert.That(buyer.Discount, Is.EqualTo(discount));
+        });
+    }
+    private static BuyerDataModel CreateDataModel(string? id, string? name,
+    string? phoneNumber, double discount) =>
+    new(id, name, phoneNumber, discount);
+
+}

AndDietCoke/AndDietCokeTests/DataModelsTests/DishDataModelTests.cs

@@ -0,0 +1,96 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Enums;
+using AndDietCokeContract.Exceptions;
+using static NUnit.Framework.Internal.OSPlatform;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class DishDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var dish = CreateDataModel(null, "name", DishType.Snack,
+        10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(string.Empty, "name",
+        DishType.Snack, 10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var dish = CreateDataModel("id", "name", DishType.Snack,
+        10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishNameIsEmptyTest()
+    {
+        var dish = CreateDataModel(Guid.NewGuid().ToString(), null,
+        DishType.Snack, 10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(Guid.NewGuid().ToString(), string.Empty,
+        DishType.Snack, 10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishTypeIsNoneTest()
+    {
+        var dish = CreateDataModel(Guid.NewGuid().ToString(), null,
+        DishType.None, 10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    
+    
+    [Test]
+    public void PriceIsLessOrZeroTest()
+    {
+        var dish = CreateDataModel(Guid.NewGuid().ToString(), "name",
+        DishType.Snack, 0, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(Guid.NewGuid().ToString(), "name",
+        DishType.Snack, -10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var dishId = Guid.NewGuid().ToString();
+        var dishName = "name";
+        var dishType = DishType.Snack;
+        var dishManufacturerId = Guid.NewGuid().ToString();
+        var dishPrice = 10;
+        var dishIsDelete = false;
+        var dish = CreateDataModel(dishId, dishName, dishType,
+        dishPrice, dishIsDelete);
+        Assert.That(() => dish.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dish.Id, Is.EqualTo(dishId));
+            Assert.That(dish.DishName, Is.EqualTo(dishName));
+            Assert.That(dish.DishType, Is.EqualTo(dishType));
+            Assert.That(dish.Price, Is.EqualTo(dishPrice));
+            Assert.That(dish.IsDeleted, Is.EqualTo(dishIsDelete));
+        });
+    }
+    private static DishDataModel CreateDataModel(string? id, string?
+    dishName, DishType dishType, double price, bool
+    isDeleted) =>
+    new(id, dishName, dishType, price, isDeleted);
+
+}

AndDietCoke/AndDietCokeTests/DataModelsTests/DishHistoryDataModelTests.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class DishHistoryDataModelTests
+{
+    [Test]
+    public void DishIdIsNullOrEmptyTest()
+    {
+        var dish = CreateDataModel(null, 10);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(string.Empty, 10);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishIdIsNotGuidTest()
+    {
+        var dish = CreateDataModel("id", 10);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void OldPriceIsLessOrZeroTest()
+    {
+        var dish = CreateDataModel(Guid.NewGuid().ToString(), 0);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(Guid.NewGuid().ToString(), -10);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var dishId = Guid.NewGuid().ToString();
+        var oldPrice = 10;
+        var dishHistory = CreateDataModel(dishId, oldPrice);
+        Assert.That(() => dishHistory.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dishHistory.DishId, Is.EqualTo(dishId));
+            Assert.That(dishHistory.OldPrice, Is.EqualTo(oldPrice));
+            Assert.That(dishHistory.ChangeDate,
+            Is.LessThan(DateTime.UtcNow));
+            Assert.That(dishHistory.ChangeDate,
+            Is.GreaterThan(DateTime.UtcNow.AddMinutes(-1)));
+        });
+    }
+    private static DishHistoryDataModel CreateDataModel(string? dishId,
+    double oldPrice) =>
+    new(dishId, oldPrice);
+}

AndDietCoke/AndDietCokeTests/DataModelsTests/PostDataModelTests.cs

@@ -0,0 +1,117 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Enums;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class PostDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var post = CreateDataModel(null, Guid.NewGuid().ToString(), "name",
+        PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(string.Empty, Guid.NewGuid().ToString(),
+        "name", PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var post = CreateDataModel("id", Guid.NewGuid().ToString(), "name",
+        PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PostIdIsNullEmptyTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), null, "name",
+        PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(Guid.NewGuid().ToString(), string.Empty,
+        "name", PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PostIdIsNotGuidTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), "postId",
+        "name", PostType.DeliveryMan, 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.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => manufacturer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        manufacturer = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), string.Empty, PostType.DeliveryMan, 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.DeliveryMan, 0, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), "name", PostType.DeliveryMan, -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.DeliveryMan;
+        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);  
+}

AndDietCoke/AndDietCokeTests/DataModelsTests/SalaryDataModelTests.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.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 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);
+
+}

AndDietCoke/AndDietCokeTests/DataModelsTests/SaleDataModelTests.cs

@@ -0,0 +1,132 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Enums;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class SaleDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(null, Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false,
+        CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(string.Empty, Guid.NewGuid().ToString(),
+        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(),
+        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,
+        Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false,
+        CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(), string.Empty,
+        Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false,
+        CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void WorkerIdIsNotGuidTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), "workerId",
+        Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false,
+        CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void BuyerIdIsNotGuidTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), "buyerId", 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(), Guid.NewGuid().ToString(), 0, DiscountType.OnSale, 10,
+        false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), -10, DiscountType.OnSale,
+        10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishsIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(),
+        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(), 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 dishs = CreateSubDataModel();
+        var sale = CreateDataModel(saleId, workerId, buyerId, sum,
+        discountType, discount, isCancel, dishs);
+        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.BuyerId, Is.EqualTo(buyerId));
+            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.Dishes, Is.EquivalentTo(dishs));
+        });
+    }
+    private static SaleDataModel CreateDataModel(string? id, string? workerId,
+    string? buyerId, double sum, DiscountType discountType, double discount, bool
+    isCancel, List<SaleDishDataModel>? dishs) =>
+    new(id, workerId, buyerId, sum, discountType, discount, isCancel,
+    dishs);
+    private static List<SaleDishDataModel> CreateSubDataModel()
+    => [new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 1)];
+
+}

AndDietCoke/AndDietCokeTests/DataModelsTests/SaleDishDataModelTests.cs

@@ -0,0 +1,84 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class SaleDishDataModelTests
+{
+    [Test]
+    public void SaleIdIsNullOrEmptyTest()
+    {
+        var saleDish = CreateDataModel(null, Guid.NewGuid().ToString(),
+        10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        saleDish = CreateDataModel(string.Empty,
+        Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void SaleIdIsNotGuidTest()
+    {
+        var saleDish = CreateDataModel("saleId",
+        Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishIdIsNullOrEmptyTest()
+    {
+        var saleDish = CreateDataModel(Guid.NewGuid().ToString(), null,
+        10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        saleDish = CreateDataModel(string.Empty,
+        Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishIdIsNotGuidTest()
+    {
+        var saleDish = CreateDataModel(Guid.NewGuid().ToString(),
+        "dishId", 10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void CountIsLessOrZeroTest()
+    {
+        var saleDish = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), 0);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        saleDish = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), -10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var saleId = Guid.NewGuid().ToString();
+        var dishId = Guid.NewGuid().ToString();
+        var count = 10;
+        var saleDish = CreateDataModel(saleId, dishId, count);
+        Assert.That(() => saleDish.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(saleDish.SaleId, Is.EqualTo(saleId));
+            Assert.That(saleDish.DishId, Is.EqualTo(dishId));
+            Assert.That(saleDish.Count, Is.EqualTo(count));
+        });
+    }
+    private static SaleDishDataModel CreateDataModel(string? saleId, string? dishId, int count) =>
+    new(saleId, dishId, count);
+
+}

AndDietCoke/AndDietCokeTests/DataModelsTests/WorkerDataModelTests.cs

@@ -0,0 +1,116 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.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 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);
+
+}

AndDietCoke/TestProject1/AndDietCokeTests.csproj

@@ -0,0 +1,24 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.1" />
+    <PackageReference Include="NUnit" Version="3.13.3" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.4.2" />
+    <PackageReference Include="NUnit.Analyzers" Version="3.6.1" />
+    <PackageReference Include="coverlet.collector" Version="3.2.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\AndDietCokeContract\AndDietCokeContract.csproj" />
+  </ItemGroup>
+
+</Project>

AndDietCoke/TestProject1/DataModelsTests/BuyerDataModelTests.cs

@@ -0,0 +1,84 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class BuyerDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var buyer = CreateDataModel(null, "name", "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        buyer = CreateDataModel(string.Empty, "name", "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var buyer = CreateDataModel("id", "name", "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void NameIsNullOrEmptyTest()
+    {
+        var buyer = CreateDataModel(Guid.NewGuid().ToString(), null,
+        "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        buyer = CreateDataModel(Guid.NewGuid().ToString(), string.Empty,
+        "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PhoneNumberIsNullOrEmptyTest()
+    {
+        var buyer = CreateDataModel(Guid.NewGuid().ToString(), "name", null,
+        10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        buyer = CreateDataModel(Guid.NewGuid().ToString(), "name",
+        string.Empty, 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PhoneNumberIsIncorrectTest()
+    {
+        var buyer = CreateDataModel(Guid.NewGuid().ToString(), "name", "777",
+        10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var buyerId = Guid.NewGuid().ToString();
+        var name = "name";
+        var phoneNumber = "+7-777-777-77-77";
+        var discount = 11;
+        var buyer = CreateDataModel(buyerId, name, phoneNumber, discount);
+        Assert.That(() => buyer.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(buyer.Id, Is.EqualTo(buyerId));
+            Assert.That(buyer.Name, Is.EqualTo(name));
+            Assert.That(buyer.PhoneNumber, Is.EqualTo(phoneNumber));
+            Assert.That(buyer.Discount, Is.EqualTo(discount));
+        });
+    }
+    private static BuyerDataModel CreateDataModel(string? id, string? name,
+    string? phoneNumber, double discount) =>
+    new(id, name, phoneNumber, discount);
+
+}

AndDietCoke/TestProject1/DataModelsTests/DishDataModelTests.cs

@@ -0,0 +1,96 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Enums;
+using AndDietCokeContract.Exceptions;
+using static NUnit.Framework.Internal.OSPlatform;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class DishDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var dish = CreateDataModel(null, "name", DishType.Snack,
+        10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(string.Empty, "name",
+        DishType.Snack, 10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var dish = CreateDataModel("id", "name", DishType.Snack,
+        10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishNameIsEmptyTest()
+    {
+        var dish = CreateDataModel(Guid.NewGuid().ToString(), null,
+        DishType.Snack, 10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(Guid.NewGuid().ToString(), string.Empty,
+        DishType.Snack, 10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishTypeIsNoneTest()
+    {
+        var dish = CreateDataModel(Guid.NewGuid().ToString(), null,
+        DishType.None, 10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    
+    
+    [Test]
+    public void PriceIsLessOrZeroTest()
+    {
+        var dish = CreateDataModel(Guid.NewGuid().ToString(), "name",
+        DishType.Snack, 0, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(Guid.NewGuid().ToString(), "name",
+        DishType.Snack, -10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var dishId = Guid.NewGuid().ToString();
+        var dishName = "name";
+        var dishType = DishType.Snack;
+        var dishManufacturerId = Guid.NewGuid().ToString();
+        var dishPrice = 10;
+        var dishIsDelete = false;
+        var dish = CreateDataModel(dishId, dishName, dishType,
+        dishPrice, dishIsDelete);
+        Assert.That(() => dish.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dish.Id, Is.EqualTo(dishId));
+            Assert.That(dish.DishName, Is.EqualTo(dishName));
+            Assert.That(dish.DishType, Is.EqualTo(dishType));
+            Assert.That(dish.Price, Is.EqualTo(dishPrice));
+            Assert.That(dish.IsDeleted, Is.EqualTo(dishIsDelete));
+        });
+    }
+    private static DishDataModel CreateDataModel(string? id, string?
+    dishName, DishType dishType, double price, bool
+    isDeleted) =>
+    new(id, dishName, dishType, price, isDeleted);
+
+}

AndDietCoke/TestProject1/DataModelsTests/DishHistoryDataModelTests.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class DishHistoryDataModelTests
+{
+    [Test]
+    public void DishIdIsNullOrEmptyTest()
+    {
+        var dish = CreateDataModel(null, 10);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(string.Empty, 10);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishIdIsNotGuidTest()
+    {
+        var dish = CreateDataModel("id", 10);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void OldPriceIsLessOrZeroTest()
+    {
+        var dish = CreateDataModel(Guid.NewGuid().ToString(), 0);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(Guid.NewGuid().ToString(), -10);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var dishId = Guid.NewGuid().ToString();
+        var oldPrice = 10;
+        var dishHistory = CreateDataModel(dishId, oldPrice);
+        Assert.That(() => dishHistory.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dishHistory.DishId, Is.EqualTo(dishId));
+            Assert.That(dishHistory.OldPrice, Is.EqualTo(oldPrice));
+            Assert.That(dishHistory.ChangeDate,
+            Is.LessThan(DateTime.UtcNow));
+            Assert.That(dishHistory.ChangeDate,
+            Is.GreaterThan(DateTime.UtcNow.AddMinutes(-1)));
+        });
+    }
+    private static DishHistoryDataModel CreateDataModel(string? dishId,
+    double oldPrice) =>
+    new(dishId, oldPrice);
+}

AndDietCoke/TestProject1/DataModelsTests/PostDataModelTests.cs

@@ -0,0 +1,117 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Enums;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class PostDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var post = CreateDataModel(null, Guid.NewGuid().ToString(), "name",
+        PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(string.Empty, Guid.NewGuid().ToString(),
+        "name", PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var post = CreateDataModel("id", Guid.NewGuid().ToString(), "name",
+        PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PostIdIsNullEmptyTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), null, "name",
+        PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(Guid.NewGuid().ToString(), string.Empty,
+        "name", PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PostIdIsNotGuidTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), "postId",
+        "name", PostType.DeliveryMan, 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.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => manufacturer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        manufacturer = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), string.Empty, PostType.DeliveryMan, 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.DeliveryMan, 0, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), "name", PostType.DeliveryMan, -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.DeliveryMan;
+        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);  
+}

AndDietCoke/TestProject1/DataModelsTests/SalaryDataModelTests.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.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 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);
+
+}

AndDietCoke/TestProject1/DataModelsTests/SaleDataModelTests.cs

@@ -0,0 +1,132 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Enums;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class SaleDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(null, Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false,
+        CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(string.Empty, Guid.NewGuid().ToString(),
+        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(),
+        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,
+        Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false,
+        CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(), string.Empty,
+        Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false,
+        CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void WorkerIdIsNotGuidTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), "workerId",
+        Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false,
+        CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void BuyerIdIsNotGuidTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), "buyerId", 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(), Guid.NewGuid().ToString(), 0, DiscountType.OnSale, 10,
+        false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), -10, DiscountType.OnSale,
+        10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishsIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(),
+        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(), 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 dishs = CreateSubDataModel();
+        var sale = CreateDataModel(saleId, workerId, buyerId, sum,
+        discountType, discount, isCancel, dishs);
+        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.BuyerId, Is.EqualTo(buyerId));
+            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.Dishes, Is.EquivalentTo(dishs));
+        });
+    }
+    private static SaleDataModel CreateDataModel(string? id, string? workerId,
+    string? buyerId, double sum, DiscountType discountType, double discount, bool
+    isCancel, List<SaleDishDataModel>? dishs) =>
+    new(id, workerId, buyerId, sum, discountType, discount, isCancel,
+    dishs);
+    private static List<SaleDishDataModel> CreateSubDataModel()
+    => [new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 1)];
+
+}

AndDietCoke/TestProject1/DataModelsTests/SaleDishDataModelTests.cs

@@ -0,0 +1,84 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class SaleDishDataModelTests
+{
+    [Test]
+    public void SaleIdIsNullOrEmptyTest()
+    {
+        var saleDish = CreateDataModel(null, Guid.NewGuid().ToString(),
+        10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        saleDish = CreateDataModel(string.Empty,
+        Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void SaleIdIsNotGuidTest()
+    {
+        var saleDish = CreateDataModel("saleId",
+        Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishIdIsNullOrEmptyTest()
+    {
+        var saleDish = CreateDataModel(Guid.NewGuid().ToString(), null,
+        10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        saleDish = CreateDataModel(string.Empty,
+        Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishIdIsNotGuidTest()
+    {
+        var saleDish = CreateDataModel(Guid.NewGuid().ToString(),
+        "dishId", 10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void CountIsLessOrZeroTest()
+    {
+        var saleDish = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), 0);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        saleDish = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), -10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var saleId = Guid.NewGuid().ToString();
+        var dishId = Guid.NewGuid().ToString();
+        var count = 10;
+        var saleDish = CreateDataModel(saleId, dishId, count);
+        Assert.That(() => saleDish.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(saleDish.SaleId, Is.EqualTo(saleId));
+            Assert.That(saleDish.DishId, Is.EqualTo(dishId));
+            Assert.That(saleDish.Count, Is.EqualTo(count));
+        });
+    }
+    private static SaleDishDataModel CreateDataModel(string? saleId, string? dishId, int count) =>
+    new(saleId, dishId, count);
+
+}

AndDietCoke/TestProject1/DataModelsTests/WorkerDataModelTests.cs

@@ -0,0 +1,116 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.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 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);
+
+}

AndDietCoke/TestProject2/AndDietCokeTests.csproj

@@ -0,0 +1,28 @@
+<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="coverlet.collector" Version="6.0.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
+    <PackageReference Include="NUnit" Version="3.14.0" />
+    <PackageReference Include="NUnit.Analyzers" Version="3.9.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\AndDietCokeContract\AndDietCokeContract.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="NUnit.Framework" />
+  </ItemGroup>
+
+</Project>

AndDietCoke/TestProject2/DataModelsTests/BuyerDataModelTests.cs

@@ -0,0 +1,84 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class BuyerDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var buyer = CreateDataModel(null, "name", "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        buyer = CreateDataModel(string.Empty, "name", "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var buyer = CreateDataModel("id", "name", "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void NameIsNullOrEmptyTest()
+    {
+        var buyer = CreateDataModel(Guid.NewGuid().ToString(), null,
+        "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        buyer = CreateDataModel(Guid.NewGuid().ToString(), string.Empty,
+        "number", 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PhoneNumberIsNullOrEmptyTest()
+    {
+        var buyer = CreateDataModel(Guid.NewGuid().ToString(), "name", null,
+        10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        buyer = CreateDataModel(Guid.NewGuid().ToString(), "name",
+        string.Empty, 10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PhoneNumberIsIncorrectTest()
+    {
+        var buyer = CreateDataModel(Guid.NewGuid().ToString(), "name", "777",
+        10);
+        Assert.That(() => buyer.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var buyerId = Guid.NewGuid().ToString();
+        var name = "name";
+        var phoneNumber = "+7-777-777-77-77";
+        var discount = 11;
+        var buyer = CreateDataModel(buyerId, name, phoneNumber, discount);
+        Assert.That(() => buyer.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(buyer.Id, Is.EqualTo(buyerId));
+            Assert.That(buyer.Name, Is.EqualTo(name));
+            Assert.That(buyer.PhoneNumber, Is.EqualTo(phoneNumber));
+            Assert.That(buyer.Discount, Is.EqualTo(discount));
+        });
+    }
+    private static BuyerDataModel CreateDataModel(string? id, string? name,
+    string? phoneNumber, double discount) =>
+    new(id, name, phoneNumber, discount);
+
+}

AndDietCoke/TestProject2/DataModelsTests/DishDataModelTests.cs

@@ -0,0 +1,96 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Enums;
+using AndDietCokeContract.Exceptions;
+using static NUnit.Framework.Internal.OSPlatform;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class DishDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var dish = CreateDataModel(null, "name", DishType.Snack,
+        10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(string.Empty, "name",
+        DishType.Snack, 10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var dish = CreateDataModel("id", "name", DishType.Snack,
+        10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishNameIsEmptyTest()
+    {
+        var dish = CreateDataModel(Guid.NewGuid().ToString(), null,
+        DishType.Snack, 10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(Guid.NewGuid().ToString(), string.Empty,
+        DishType.Snack, 10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishTypeIsNoneTest()
+    {
+        var dish = CreateDataModel(Guid.NewGuid().ToString(), null,
+        DishType.None, 10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    
+    
+    [Test]
+    public void PriceIsLessOrZeroTest()
+    {
+        var dish = CreateDataModel(Guid.NewGuid().ToString(), "name",
+        DishType.Snack, 0, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(Guid.NewGuid().ToString(), "name",
+        DishType.Snack, -10, false);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var dishId = Guid.NewGuid().ToString();
+        var dishName = "name";
+        var dishType = DishType.Snack;
+        var dishManufacturerId = Guid.NewGuid().ToString();
+        var dishPrice = 10;
+        var dishIsDelete = false;
+        var dish = CreateDataModel(dishId, dishName, dishType,
+        dishPrice, dishIsDelete);
+        Assert.That(() => dish.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dish.Id, Is.EqualTo(dishId));
+            Assert.That(dish.DishName, Is.EqualTo(dishName));
+            Assert.That(dish.DishType, Is.EqualTo(dishType));
+            Assert.That(dish.Price, Is.EqualTo(dishPrice));
+            Assert.That(dish.IsDeleted, Is.EqualTo(dishIsDelete));
+        });
+    }
+    private static DishDataModel CreateDataModel(string? id, string?
+    dishName, DishType dishType, double price, bool
+    isDeleted) =>
+    new(id, dishName, dishType, price, isDeleted);
+
+}

AndDietCoke/TestProject2/DataModelsTests/DishHistoryDataModelTests.cs

@@ -0,0 +1,61 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class DishHistoryDataModelTests
+{
+    [Test]
+    public void DishIdIsNullOrEmptyTest()
+    {
+        var dish = CreateDataModel(null, 10);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(string.Empty, 10);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishIdIsNotGuidTest()
+    {
+        var dish = CreateDataModel("id", 10);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void OldPriceIsLessOrZeroTest()
+    {
+        var dish = CreateDataModel(Guid.NewGuid().ToString(), 0);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        dish = CreateDataModel(Guid.NewGuid().ToString(), -10);
+        Assert.That(() => dish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var dishId = Guid.NewGuid().ToString();
+        var oldPrice = 10;
+        var dishHistory = CreateDataModel(dishId, oldPrice);
+        Assert.That(() => dishHistory.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(dishHistory.DishId, Is.EqualTo(dishId));
+            Assert.That(dishHistory.OldPrice, Is.EqualTo(oldPrice));
+            Assert.That(dishHistory.ChangeDate,
+            Is.LessThan(DateTime.UtcNow));
+            Assert.That(dishHistory.ChangeDate,
+            Is.GreaterThan(DateTime.UtcNow.AddMinutes(-1)));
+        });
+    }
+    private static DishHistoryDataModel CreateDataModel(string? dishId,
+    double oldPrice) =>
+    new(dishId, oldPrice);
+}

AndDietCoke/TestProject2/DataModelsTests/PostDataModelTests.cs

@@ -0,0 +1,117 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Enums;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class PostDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var post = CreateDataModel(null, Guid.NewGuid().ToString(), "name",
+        PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(string.Empty, Guid.NewGuid().ToString(),
+        "name", PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var post = CreateDataModel("id", Guid.NewGuid().ToString(), "name",
+        PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PostIdIsNullEmptyTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), null, "name",
+        PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(Guid.NewGuid().ToString(), string.Empty,
+        "name", PostType.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void PostIdIsNotGuidTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), "postId",
+        "name", PostType.DeliveryMan, 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.DeliveryMan, 10, true, DateTime.UtcNow);
+        Assert.That(() => manufacturer.Validate(),
+        Throws.TypeOf<ValidationException>());
+        manufacturer = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), string.Empty, PostType.DeliveryMan, 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.DeliveryMan, 0, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(),
+        Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), "name", PostType.DeliveryMan, -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.DeliveryMan;
+        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);  
+}

AndDietCoke/TestProject2/DataModelsTests/SalaryDataModelTests.cs

@@ -0,0 +1,62 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.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 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);
+
+}

AndDietCoke/TestProject2/DataModelsTests/SaleDataModelTests.cs

@@ -0,0 +1,132 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Enums;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class SaleDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(null, Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false,
+        CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(string.Empty, Guid.NewGuid().ToString(),
+        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(),
+        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,
+        Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false,
+        CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(), string.Empty,
+        Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false,
+        CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void WorkerIdIsNotGuidTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(), "workerId",
+        Guid.NewGuid().ToString(), 10, DiscountType.OnSale, 10, false,
+        CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void BuyerIdIsNotGuidTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), "buyerId", 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(), Guid.NewGuid().ToString(), 0, DiscountType.OnSale, 10,
+        false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+        sale = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), -10, DiscountType.OnSale,
+        10, false, CreateSubDataModel());
+        Assert.That(() => sale.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishsIsNullOrEmptyTest()
+    {
+        var sale = CreateDataModel(Guid.NewGuid().ToString(),
+        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(), 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 dishs = CreateSubDataModel();
+        var sale = CreateDataModel(saleId, workerId, buyerId, sum,
+        discountType, discount, isCancel, dishs);
+        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.BuyerId, Is.EqualTo(buyerId));
+            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.Dishes, Is.EquivalentTo(dishs));
+        });
+    }
+    private static SaleDataModel CreateDataModel(string? id, string? workerId,
+    string? buyerId, double sum, DiscountType discountType, double discount, bool
+    isCancel, List<SaleDishDataModel>? dishs) =>
+    new(id, workerId, buyerId, sum, discountType, discount, isCancel,
+    dishs);
+    private static List<SaleDishDataModel> CreateSubDataModel()
+    => [new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 1)];
+
+}

AndDietCoke/TestProject2/DataModelsTests/SaleDishDataModelTests.cs

@@ -0,0 +1,84 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.DataModelsTests;
+
+[TestFixture]
+internal class SaleDishDataModelTests
+{
+    [Test]
+    public void SaleIdIsNullOrEmptyTest()
+    {
+        var saleDish = CreateDataModel(null, Guid.NewGuid().ToString(),
+        10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        saleDish = CreateDataModel(string.Empty,
+        Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void SaleIdIsNotGuidTest()
+    {
+        var saleDish = CreateDataModel("saleId",
+        Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishIdIsNullOrEmptyTest()
+    {
+        var saleDish = CreateDataModel(Guid.NewGuid().ToString(), null,
+        10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        saleDish = CreateDataModel(string.Empty,
+        Guid.NewGuid().ToString(), 10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void DishIdIsNotGuidTest()
+    {
+        var saleDish = CreateDataModel(Guid.NewGuid().ToString(),
+        "dishId", 10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void CountIsLessOrZeroTest()
+    {
+        var saleDish = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), 0);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+        saleDish = CreateDataModel(Guid.NewGuid().ToString(),
+        Guid.NewGuid().ToString(), -10);
+        Assert.That(() => saleDish.Validate(),
+        Throws.TypeOf<ValidationException>());
+    }
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var saleId = Guid.NewGuid().ToString();
+        var dishId = Guid.NewGuid().ToString();
+        var count = 10;
+        var saleDish = CreateDataModel(saleId, dishId, count);
+        Assert.That(() => saleDish.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(saleDish.SaleId, Is.EqualTo(saleId));
+            Assert.That(saleDish.DishId, Is.EqualTo(dishId));
+            Assert.That(saleDish.Count, Is.EqualTo(count));
+        });
+    }
+    private static SaleDishDataModel CreateDataModel(string? saleId, string? dishId, int count) =>
+    new(saleId, dishId, count);
+
+}

AndDietCoke/TestProject2/DataModelsTests/WorkerDataModelTests.cs

@@ -0,0 +1,116 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using AndDietCokeContract.DataModels;
+using AndDietCokeContract.Exceptions;
+
+namespace AndDietCokeTests.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 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);
+
+}