JewelryStoreContracts/JewelryStoreContracts.sln

@@ -1,10 +1,12 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
-VisualStudioVersion = 17.13.35806.99 d17.13
+VisualStudioVersion = 17.13.35806.99
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "JewelryStoreContracts", "JewelryStoreContracts\JewelryStoreContracts.csproj", "{14756BCC-EFF7-4643-8713-547C93AF5728}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "JewelryStoreTests", "JewelryStoreTests\JewelryStoreTests.csproj", "{B2046245-F218-4137-88EC-4856046EBDDC}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -15,6 +17,10 @@ Global
 		{14756BCC-EFF7-4643-8713-547C93AF5728}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{14756BCC-EFF7-4643-8713-547C93AF5728}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{14756BCC-EFF7-4643-8713-547C93AF5728}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B2046245-F218-4137-88EC-4856046EBDDC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B2046245-F218-4137-88EC-4856046EBDDC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B2046245-F218-4137-88EC-4856046EBDDC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B2046245-F218-4137-88EC-4856046EBDDC}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

JewelryStoreContracts/JewelryStoreContracts/DataModels/CraftDataModel.cs

@@ -0,0 +1,36 @@
+using JewelryStoreContracts.Exceptions;
+using JewelryStoreContracts.Extensions;
+
+namespace JewelryStoreContracts.DataModels;
+
+public class CraftDataModel(string? id, string? workerId, DateTime craftDate, double additionalPrice)
+{
+    public string Id { get; private set; } = id;
+
+    public string WorkerId { get; private set; } = workerId;
+
+    public DateTime CraftDate { get; private set; } = craftDate;
+
+    public double AdditionalPrice { get; private set; } = additionalPrice;
+
+    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 (CraftDate.Date > DateTime.Now)
+            throw new ValidationException($"It is impossible to craft things in the future");
+
+        if (AdditionalPrice <= 0)
+            throw new ValidationException("Field AdditionalPrice is less than or equal to 0");
+    }
+}

JewelryStoreContracts/JewelryStoreContracts/DataModels/MaterialDataModel.cs

@@ -0,0 +1,42 @@
+using JewelryStoreContracts.Enums;
+using JewelryStoreContracts.Exceptions;
+using JewelryStoreContracts.Extensions;
+using JewelryStoreContracts.Infrastructure;
+
+namespace JewelryStoreContracts.DataModels;
+
+public class MaterialDataModel(string id, string materialName, MaterialType materialType, double weight, double price, bool isDeleted) : IValidation
+{
+    public string Id { get; private set; } = id;
+
+    public string MaterialName { get; private set; } = materialName;
+
+    public MaterialType MaterialType { get; private set; } = materialType;
+
+    public double Weight { get; private set; } = weight;
+
+    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 (MaterialName.IsEmpty())
+            throw new ValidationException("Field MaterialName is empty");
+
+        if (Weight <= 0)
+            throw new ValidationException("Field Weight is less than or equal to 0");
+
+        if (Price <= 0)
+            throw new ValidationException("Field Price is less than or equal to 0");
+
+        if (MaterialType == MaterialType.None)
+            throw new ValidationException("Field MaterialType is empty");
+    }
+}

JewelryStoreContracts/JewelryStoreContracts/DataModels/PostDataModel.cs

@@ -0,0 +1,47 @@
+using JewelryStoreContracts.Enums;
+using JewelryStoreContracts.Exceptions;
+using JewelryStoreContracts.Extensions;
+using JewelryStoreContracts.Infrastructure;
+
+namespace JewelryStoreContracts.DataModels;
+
+public class PostDataModel(string id, string postId, string postName, PostType postType, double pay, 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 Pay { get; private set; } = pay;
+
+    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 (Pay <= 0)
+            throw new ValidationException("Field Pay is empty");
+    }
+}

JewelryStoreContracts/JewelryStoreContracts/DataModels/ProductComponentDataModel.cs

@@ -0,0 +1,32 @@
+using JewelryStoreContracts.Exceptions;
+using JewelryStoreContracts.Extensions;
+using JewelryStoreContracts.Infrastructure;
+
+namespace JewelryStoreContracts.DataModels;
+
+public class ProductComponentDataModel(string? productId, string? componentId, int count) : IValidation
+{
+    public string ProductId { get; private set; } = productId;
+
+    public string ComponentId { get; private set; } = componentId;
+
+    public int Count { get; private set; } = count;
+
+    public void Validate()
+    {
+        if (ProductId.IsEmpty())
+            throw new ValidationException("Field ProductId is empty");
+
+        if (!ProductId.IsGuid())
+            throw new ValidationException("The value in the field ProductId is not a unique identifier");
+
+        if (ComponentId.IsEmpty())
+            throw new ValidationException("Field ComponentId is empty");
+
+        if (!ComponentId.IsGuid())
+            throw new ValidationException("The value in the field ComponentId is not a unique identifier");
+
+        if (Count <= 0)
+            throw new ValidationException("Field Count is less than or equal to 0");
+    }
+}

JewelryStoreContracts/JewelryStoreContracts/DataModels/ProductDataModel.cs

@@ -0,0 +1,50 @@
+using JewelryStoreContracts.Enums;
+using JewelryStoreContracts.Exceptions;
+using JewelryStoreContracts.Extensions;
+using JewelryStoreContracts.Infrastructure;
+
+namespace JewelryStoreContracts.DataModels;
+
+public class ProductDataModel(string id, string productName, string craftId, ProductType productType, double price, bool isDeleted, List<ProductComponentDataModel> components) : IValidation
+{
+    public string Id { get; private set; } = id;
+
+    public string ProductName { get; private set; } = productName;
+
+    public ProductType ProductType { get; private set; } = productType;
+
+    public string CraftId { get; private set; } = craftId;
+
+    public double Price { get; private set; } = price;
+
+    public bool IsDeleted { get; private set; } = isDeleted;
+
+    public List<ProductComponentDataModel> Components { get; private set; } = components;
+
+    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 (ProductName.IsEmpty())
+            throw new ValidationException("Field ProductName is empty");
+
+        if (ProductType == ProductType.None)
+            throw new ValidationException("Field ProductType is empty");
+
+        if (CraftId.IsEmpty())
+            throw new ValidationException("Field CraftId is empty");
+
+        if (!CraftId.IsGuid())
+            throw new ValidationException("The value in the field CraftId is not a unique identifier");
+
+        if (Price <= 0)
+            throw new ValidationException("Field Price is less than or equal to 0");
+
+        if ((Components?.Count ?? 0) == 0)
+            throw new ValidationException("The sale must include products");
+    }
+}

JewelryStoreContracts/JewelryStoreContracts/DataModels/ProductHistoryDataModel.cs

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

JewelryStoreContracts/JewelryStoreContracts/DataModels/SalaryDataModel.cs

@@ -0,0 +1,29 @@
+using JewelryStoreContracts.Exceptions;
+using JewelryStoreContracts.Extensions;
+using JewelryStoreContracts.Infrastructure;
+
+namespace JewelryStoreContracts.DataModels;
+
+public class SalaryDataModel(string workerId, DateTime salaryDate, double salary) : IValidation
+{
+    public string WorkerId { get; private set; } = workerId;
+
+    public DateTime SalaryDate { get; private set; } = salaryDate;
+
+    public double Salary { get; private set; } = salary;
+
+    public void Validate() 
+    { 
+        if (WorkerId.IsEmpty())
+            throw new ValidationException("Field WorkerId is empty");
+
+        if (!WorkerId.IsGuid())
+            throw new ValidationException("The value in the field WorkerId is not a unique identifier");
+
+        if (Salary <= 0)
+            throw new ValidationException("Field Salary is less than or equal to 0");
+
+        if (SalaryDate.Date > DateTime.Now)
+            throw new ValidationException($"It is impossible to pay Salary in the future");
+    }
+}

JewelryStoreContracts/JewelryStoreContracts/DataModels/WorkerDataModel.cs

@@ -0,0 +1,51 @@
+using JewelryStoreContracts.Exceptions;
+using JewelryStoreContracts.Extensions;
+using JewelryStoreContracts.Infrastructure;
+using System.Text.RegularExpressions;
+
+namespace JewelryStoreContracts.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(-18).Date)
+            throw new ValidationException($"Minors cannot be hired (BirthDate = {BirthDate.ToShortDateString()})");
+
+        if (!Regex.IsMatch(FIO, @"^([A-Za-zА-ЯЁ][a-zA-Zа-яё]+)\s+([A-Za-zА-ЯЁ][a-zA-Zа-яё]+)\s+([A-Za-zА-ЯЁ][a-zA-Zа-яё]+)$"))
+            throw new ValidationException("Field FIO must contain exactly three words, each starting with a capital letter.");
+
+        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 < 18)
+            throw new ValidationException($"Minors cannot be hired (EmploymentDate - {EmploymentDate.ToShortDateString()}, BirthDate - {BirthDate.ToShortDateString()})");
+    }
+}

JewelryStoreContracts/JewelryStoreContracts/Enums/MaterialType.cs

@@ -0,0 +1,15 @@
+namespace JewelryStoreContracts.Enums;
+
+[Flags]
+public enum MaterialType
+{
+    None = 0,
+    Gold = 1,
+    Silver = 2,
+    Platinum = 4,
+    Palladium = 8,
+    Diamond = 16,
+    Ruby = 32,
+    Sapphire = 64,
+    Emerald = 128,
+}

JewelryStoreContracts/JewelryStoreContracts/Enums/PostType.cs

@@ -0,0 +1,10 @@
+namespace JewelryStoreContracts.Enums;
+
+public enum PostType
+{
+    None = 0,
+    Evaluation = 1,
+    Cutting = 2,
+    Selling = 3,
+    Administrative_work = 4
+}

JewelryStoreContracts/JewelryStoreContracts/Enums/ProductType.cs

@@ -0,0 +1,10 @@
+namespace JewelryStoreContracts.Enums;
+
+public enum ProductType
+{   
+    None = 0,
+    Ring = 1,
+    Necklace = 2,
+    Earrings = 3,
+    Bracelet = 4,
+}   

JewelryStoreContracts/JewelryStoreContracts/Exceptions/ValidationException.cs

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

JewelryStoreContracts/JewelryStoreContracts/Extensions/StringExtensions.cs

@@ -0,0 +1,12 @@
+namespace JewelryStoreContracts.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 _);
+    }
+}

JewelryStoreContracts/JewelryStoreContracts/Infrastructure/IValidation.cs

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

JewelryStoreContracts/JewelryStoreTests/DataModelTests/CraftDataModelTests.cs

@@ -0,0 +1,77 @@
+using JewelryStoreContracts.DataModels;
+using JewelryStoreContracts.Exceptions;
+
+namespace JewelryStoreTests.DataModelTests;
+[TestFixture]
+public class CraftDataModelTest
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var component = CreateDataModel(null, Guid.NewGuid().ToString(), DateTime.Now, 10);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+        component = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), DateTime.Now, 10);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var component = CreateDataModel("id", Guid.NewGuid().ToString(), DateTime.Now, 10);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void WorkerIdIsNullOrEmptyTest()
+    {
+        var component = CreateDataModel(Guid.NewGuid().ToString(), null, DateTime.Now, 10);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+        component = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, DateTime.Now, 10);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void WorkerIdIsNotGuidTest()
+    {
+        var component = CreateDataModel(Guid.NewGuid().ToString(), "id", DateTime.Now, 10);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AdditionalPriceIsLessOrZeroTest()
+    {
+        var component = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), DateTime.Now, -10);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+        component = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), DateTime.Now, 0);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void CraftDateIsNotCorrectTest()
+    {
+        var worker = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), DateTime.Now.AddDays(5), 0);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var craftId = Guid.NewGuid().ToString();
+        var workerId = Guid.NewGuid().ToString();
+        var componentId = Guid.NewGuid().ToString();
+        var additionalPrice = 10;
+        var date = DateTime.Now;
+        var craft = CreateDataModel(craftId, workerId, date, additionalPrice);
+        Assert.That(() => craft.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(craft.Id, Is.EqualTo(craftId));
+            Assert.That(craft.WorkerId, Is.EqualTo(workerId));
+            Assert.That(craft.CraftDate, Is.EqualTo(date));
+            Assert.That(craft.AdditionalPrice, Is.EqualTo(additionalPrice));
+        });
+    }
+
+    private static CraftDataModel CreateDataModel(string? id, string? workerId, DateTime craftDate, double additionalParice) =>
+        new(id, workerId, craftDate, additionalParice);
+}

JewelryStoreContracts/JewelryStoreTests/DataModelTests/MaterialDataModelTest.cs

@@ -0,0 +1,83 @@
+using JewelryStoreContracts.DataModels;
+using JewelryStoreContracts.Exceptions;
+using JewelryStoreContracts.Enums;
+
+namespace JewelryStoreTests.DataModelTests;
+
+class MaterialDataModelTest
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var component = CreateDataModel(null, "name", MaterialType.Gold, 15, 10, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+        component = CreateDataModel(string.Empty, "name", MaterialType.Gold, 15, 10, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var component = CreateDataModel("id", "name", MaterialType.Gold, 15, 10, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ComponentNameIsEmptyTest()
+    {
+        var component = CreateDataModel(Guid.NewGuid().ToString(), null, MaterialType.Diamond, 15, 10, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+        component = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, MaterialType.Diamond, 15, 10, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ComponentTypeIsNoneTest()
+    {
+        var component = CreateDataModel(Guid.NewGuid().ToString(), "name", MaterialType.None, 15, 10, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PriceIsLessOrZeroTest()
+    {
+        var component = CreateDataModel(Guid.NewGuid().ToString(), "name", MaterialType.Diamond, 15, -10, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+        component = CreateDataModel(Guid.NewGuid().ToString(), "name", MaterialType.Diamond, 15, 0, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void WeightIsLessOrZeroTest()
+    {
+        var component = CreateDataModel(Guid.NewGuid().ToString(), "name", MaterialType.Diamond, -15, 10, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+        component = CreateDataModel(Guid.NewGuid().ToString(), "name", MaterialType.Diamond, 0, 10, false);
+        Assert.That(() => component.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var componentId = Guid.NewGuid().ToString();
+        var componentName = "name";
+        var componentType = MaterialType.Diamond;
+        var componentWeight = 10;
+        var componentPrice = 10;
+        var componentIsDelete = false;
+        var component = CreateDataModel(componentId, componentName, componentType, componentWeight, componentPrice, componentIsDelete);
+        Assert.That(() => component.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(component.Id, Is.EqualTo(componentId));
+            Assert.That(component.MaterialName, Is.EqualTo(componentName));
+            Assert.That(component.MaterialType, Is.EqualTo(componentType));
+            Assert.That(component.Weight, Is.EqualTo(componentWeight));
+            Assert.That(component.Price, Is.EqualTo(componentPrice));
+            Assert.That(component.IsDeleted, Is.EqualTo(componentIsDelete));
+        });
+    }
+
+    private static MaterialDataModel CreateDataModel(string? id, string? name, MaterialType materialType, double weight, double price, bool isDeleted) =>
+        new(id, name, materialType, weight, price, isDeleted);
+}

JewelryStoreContracts/JewelryStoreTests/DataModelTests/PostDataModelTest.cs

@@ -0,0 +1,93 @@
+using JewelryStoreContracts.DataModels;
+using JewelryStoreContracts.Exceptions;
+using JewelryStoreContracts.Enums;
+
+namespace JewelryStoreTests.DataModelTests;
+
+[TestFixture]
+internal class PostDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var post = CreateDataModel(null, Guid.NewGuid().ToString(), "name", PostType.Evaluation, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), "name", PostType.Evaluation, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var post = CreateDataModel("id", Guid.NewGuid().ToString(), "name", PostType.Evaluation, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostIdIsNullEmptyTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), null, "name", PostType.Evaluation, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, "name", PostType.Evaluation, 10, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PostIdIsNotGuidTest()
+    {
+        var post = CreateDataModel(Guid.NewGuid().ToString(), "postId", "name", PostType.Evaluation, 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.Evaluation, 10, true, DateTime.UtcNow);
+        Assert.That(() => manufacturer.Validate(), Throws.TypeOf<ValidationException>());
+        manufacturer = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), string.Empty, PostType.Evaluation, 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.Evaluation, 0, true, DateTime.UtcNow);
+        Assert.That(() => post.Validate(), Throws.TypeOf<ValidationException>());
+        post = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), "name", PostType.Evaluation, -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.Evaluation;
+        var salary = 100;
+        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.Pay, 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);
+}

JewelryStoreContracts/JewelryStoreTests/DataModelTests/ProductComponentDataModelTest.cs

@@ -0,0 +1,68 @@
+using JewelryStoreContracts.DataModels;
+using JewelryStoreContracts.Exceptions;
+
+namespace JewelryStoreTests.DataModelTests;
+
+[TestFixture]
+public class ProductComponentDataModelTest
+{
+    [Test]
+    public void ProductIdIsNullOrEmptyTest()
+    {
+        var ComponentProduct = CreateDataModel(null, Guid.NewGuid().ToString(), 10);
+        Assert.That(() => ComponentProduct.Validate(), Throws.TypeOf<ValidationException>());
+        ComponentProduct = CreateDataModel(string.Empty, Guid.NewGuid().ToString(), 10);
+        Assert.That(() => ComponentProduct.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ProductIdIsNotGuidTest()
+    {
+        var ComponentProduct = CreateDataModel("ProductId", Guid.NewGuid().ToString(), 10);
+        Assert.That(() => ComponentProduct.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ComponentIdIsNullOrEmptyTest()
+    {
+        var ComponentProduct = CreateDataModel(Guid.NewGuid().ToString(), null, 10);
+        Assert.That(() => ComponentProduct.Validate(), Throws.TypeOf<ValidationException>());
+        ComponentProduct = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, 10);
+        Assert.That(() => ComponentProduct.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ComponentIdIsNotGuidTest()
+    {
+        var ComponentProduct = CreateDataModel(Guid.NewGuid().ToString(), "ComponentId", 10);
+        Assert.That(() => ComponentProduct.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void CountIsLessOrZeroTest()
+    {
+        var ComponentProduct = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 0);
+        Assert.That(() => ComponentProduct.Validate(), Throws.TypeOf<ValidationException>());
+        ComponentProduct = CreateDataModel(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), -10);
+        Assert.That(() => ComponentProduct.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var componentId = Guid.NewGuid().ToString();
+        var productId = Guid.NewGuid().ToString();
+        var count = 10;
+        var ComponentProduct = CreateDataModel(productId, componentId, count);
+        Assert.That(() => ComponentProduct.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(ComponentProduct.ComponentId, Is.EqualTo(componentId));
+            Assert.That(ComponentProduct.ProductId, Is.EqualTo(productId));
+            Assert.That(ComponentProduct.Count, Is.EqualTo(count));
+        });
+    }
+
+    private static ProductComponentDataModel CreateDataModel(string? productId, string? componentId, int count) =>
+        new(productId, componentId, count);
+}

JewelryStoreContracts/JewelryStoreTests/DataModelTests/ProductDataModelTest.cs

@@ -0,0 +1,105 @@
+using JewelryStoreContracts.DataModels;
+using JewelryStoreContracts.Exceptions;
+using JewelryStoreContracts.Enums;
+
+namespace JewelryStoreTests.DataModelTests;
+
+[TestFixture]
+internal class ProductDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var product = CreateDataModel(null, "name", Guid.NewGuid().ToString(), ProductType.Ring, 10, false, CreateSubDataModel());
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(string.Empty, "name", Guid.NewGuid().ToString(), ProductType.Ring, 10, false, CreateSubDataModel());
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void IdIsNotGuidTest()
+    {
+        var product = CreateDataModel("id", "name", Guid.NewGuid().ToString(), ProductType.Ring, 10, false, CreateSubDataModel());
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ProductNameIsEmptyTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), null, Guid.NewGuid().ToString(), ProductType.Ring, 10, false, CreateSubDataModel());
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(Guid.NewGuid().ToString(), string.Empty, Guid.NewGuid().ToString(), ProductType.Ring, 10, false, CreateSubDataModel());
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ProductTypeIsNoneTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), null, Guid.NewGuid().ToString(), ProductType.None, 10, false, CreateSubDataModel());
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ManufacturerIdIsNullOrEmptyTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), "name", null, ProductType.Ring, 10, false, CreateSubDataModel());
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(Guid.NewGuid().ToString(), "name", string.Empty, ProductType.Ring, 10, false, CreateSubDataModel());
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ManufacturerIdIsNotGuidTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), "name", "craftId", ProductType.Ring, 10, false, CreateSubDataModel());
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void PriceIsLessOrZeroTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), "name", Guid.NewGuid().ToString(), ProductType.Ring, 0, false, CreateSubDataModel());
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(Guid.NewGuid().ToString(), "name", Guid.NewGuid().ToString(), ProductType.Ring, -10, false, CreateSubDataModel());
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ComponentsIsNullOrEmptyTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), "name", Guid.NewGuid().ToString(), ProductType.Ring, 0, false, []);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(Guid.NewGuid().ToString(), "name", Guid.NewGuid().ToString(), ProductType.Ring, -10, false, null);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var productId = Guid.NewGuid().ToString();
+        var productName = "name";
+        var productType = ProductType.Bracelet;
+        var craftId = Guid.NewGuid().ToString();
+        var productPrice = 10;
+        var productIsDelete = false;
+        var components = CreateSubDataModel();
+        var product = CreateDataModel(productId, productName, craftId, productType, productPrice, productIsDelete, components);
+        Assert.That(() => product.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(product.Id, Is.EqualTo(productId));
+            Assert.That(product.ProductName, Is.EqualTo(productName));
+            Assert.That(product.ProductType, Is.EqualTo(productType));
+            Assert.That(product.CraftId, Is.EqualTo(craftId));
+            Assert.That(product.Price, Is.EqualTo(productPrice));
+            Assert.That(product.IsDeleted, Is.EqualTo(productIsDelete));
+            Assert.That(product.Components, Is.EquivalentTo(components));
+        });
+    }
+
+    private static ProductDataModel CreateDataModel(string? id, string? productName, string? craftId, ProductType productType, double price, bool isDeleted, List<ProductComponentDataModel> components) =>
+        new(id, productName, craftId, productType, price, isDeleted, components);
+
+    private static List<ProductComponentDataModel> CreateSubDataModel()
+    => [new(Guid.NewGuid().ToString(), Guid.NewGuid().ToString(), 1)];
+}

JewelryStoreContracts/JewelryStoreTests/DataModelTests/ProductHistoryDataModel.cs

@@ -0,0 +1,52 @@
+using JewelryStoreContracts.DataModels;
+using JewelryStoreContracts.Exceptions;
+
+namespace JewelryStoreTests.DataModelTests;
+
+[TestFixture]
+internal class ProductHistoryDataModelTests
+{
+    [Test]
+    public void ProductIdIsNullOrEmptyTest()
+    {
+        var product = CreateDataModel(null, 10);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(string.Empty, 10);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void ProductIdIsNotGuidTest()
+    {
+        var product = CreateDataModel("id", 10);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void OldPriceIsLessOrZeroTest()
+    {
+        var product = CreateDataModel(Guid.NewGuid().ToString(), 0);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+        product = CreateDataModel(Guid.NewGuid().ToString(), -10);
+        Assert.That(() => product.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void AllFieldsIsCorrectTest()
+    {
+        var productId = Guid.NewGuid().ToString();
+        var oldPrice = 10;
+        var productHistory = CreateDataModel(productId, oldPrice);
+        Assert.That(() => productHistory.Validate(), Throws.Nothing);
+        Assert.Multiple(() =>
+        {
+            Assert.That(productHistory.ProductId, Is.EqualTo(productId));
+            Assert.That(productHistory.OldPrice, Is.EqualTo(oldPrice));
+            Assert.That(productHistory.ChangeDate, Is.LessThan(DateTime.UtcNow));
+            Assert.That(productHistory.ChangeDate, Is.GreaterThan(DateTime.UtcNow.AddMinutes(-1)));
+        });
+    }
+
+    private static ProductHistoryDataModel CreateDataModel(string? productId, double oldPrice) =>
+        new(productId, oldPrice);
+}

JewelryStoreContracts/JewelryStoreTests/DataModelTests/SalaryDataModelTest.cs

@@ -0,0 +1,52 @@
+using JewelryStoreContracts.DataModels;
+using JewelryStoreContracts.Exceptions;
+
+namespace JewelryStoreTests.DataModelTests;
+
+[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);
+}

JewelryStoreContracts/JewelryStoreTests/DataModelTests/WorkerDataModelTest.cs

@@ -0,0 +1,97 @@
+using JewelryStoreContracts.DataModels;
+using JewelryStoreContracts.Exceptions;
+
+namespace JewelryStoreTests.DataModelTests;
+
+[TestFixture]
+internal class WorkerDataModelTests
+{
+    [Test]
+    public void IdIsNullOrEmptyTest()
+    {
+        var worker = CreateDataModel(null, "Fn Sn Tn", Guid.NewGuid().ToString(), DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+        worker = CreateDataModel(string.Empty, "Fn Sn Tn", 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", "Fn Sn Tn", 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 FIOIsIncorrectTest()
+    {
+        var worker = CreateDataModel(Guid.NewGuid().ToString(), "fio", 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(), "Fn Sn Tn", null, DateTime.Now.AddYears(-18), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+        worker = CreateDataModel(Guid.NewGuid().ToString(), "Fn Sn Tn", 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(), "Fn Sn Tn", "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(), "Fn Sn Tn", Guid.NewGuid().ToString(), DateTime.Now.AddYears(-18).AddDays(1), DateTime.Now, false);
+        Assert.That(() => worker.Validate(), Throws.TypeOf<ValidationException>());
+    }
+
+    [Test]
+    public void BirthDateAndEmploymentDateIsNotCorrectTest()
+    {
+        var worker = CreateDataModel(Guid.NewGuid().ToString(), "Fn Sn Tn", 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(), "Fn Sn Tn", 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 = "Firstname Secondname Fathername";
+        var postId = Guid.NewGuid().ToString();
+        var birthDate = DateTime.Now.AddYears(-18).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);
+}

JewelryStoreContracts/JewelryStoreTests/JewelryStoreTests.csproj

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