Merge branch 'feature/added_unit_test_project' of Neca/HRCenter into BE_dev

.gitignore

 /Diligent.WebAPI.Contracts/bin/Debug/net6.0
 /Diligent.WebAPI.Contracts/obj/Debug/net6.0
 /Diligent.WebAPI.Contracts/obj
+/Diligent.WebAPI.Tests/bin/Debug/net6.0
+/Diligent.WebAPI.Tests/obj/Debug/net6.0
+/Diligent.WebAPI.Tests/obj

Diligent.WebAPI.Tests/Controllers/InsurersControllerTests.cs

+using NSubstitute;
+
+namespace Diligent.WebAPI.Tests.Controllers
+{
+    public class InsurersControllerTests
+    {
+        private readonly IInsurersService iNsurersService = Substitute.For<IInsurersService>();
+        private readonly InsurersController insurersController;
+
+        public InsurersControllerTests()
+        {
+            insurersController = new InsurersController(iNsurersService);
+        }
+        
+        [Fact]
+        public async Task GetById_ShouldReturn200OK_WhenInsurerExists()
+        {
+            // Arrange
+            int insurerId = 1;
+            string insurerName = "John Doe";
+            var insurer = new InsurerViewDto
+            {
+                Id = insurerId,
+                FirstName = insurerName
+            };
+            // Act
+            var result = await insurersController.GetInsurer(insurerId);
+
+            // Assert
+            (result as OkObjectResult).StatusCode.Should().Be(200);
+        }
+    }
+}

Diligent.WebAPI.Tests/Diligent.WebAPI.Tests.csproj

+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="FluentAssertions" Version="6.8.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
+    <PackageReference Include="NSubstitute" Version="4.4.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+    <PackageReference Include="coverlet.collector" Version="3.1.2">
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+      <PrivateAssets>all</PrivateAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Diligent.WebAPI.Business\Diligent.WebAPI.Business.csproj" />
+    <ProjectReference Include="..\Diligent.WebAPI.Contracts\Diligent.WebAPI.Contracts.csproj" />
+    <ProjectReference Include="..\Diligent.WebAPI.Data\Diligent.WebAPI.Data.csproj" />
+    <ProjectReference Include="..\Diligent.WebAPI.Host\Diligent.WebAPI.Host.csproj" />
+  </ItemGroup>
+
+</Project>

Diligent.WebAPI.Tests/Usings.cs

+global using Xunit;
+global using Diligent.WebAPI.Business.Services.Interfaces;
+global using Diligent.WebAPI.Contracts.DTOs.Insurer;
+global using Diligent.WebAPI.Host.Controllers.V1;
+global using FluentAssertions;
+global using Microsoft.AspNetCore.Mvc;
+global using NSubstitute;

Diligent.WebAPI.sln

 		.editorconfig = .editorconfig
 	EndProjectSection
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Diligent.WebAPI.Contracts", "Diligent.WebAPI.Contracts\Diligent.WebAPI.Contracts.csproj", "{A0B92A73-4167-4B87-99FC-C268265BF9BA}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Diligent.WebAPI.Contracts", "Diligent.WebAPI.Contracts\Diligent.WebAPI.Contracts.csproj", "{A0B92A73-4167-4B87-99FC-C268265BF9BA}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Diligent.WebAPI.Tests", "Diligent.WebAPI.Tests\Diligent.WebAPI.Tests.csproj", "{12B60EC7-349B-4B54-B27C-E1F3551E2FDB}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		{A0B92A73-4167-4B87-99FC-C268265BF9BA}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{A0B92A73-4167-4B87-99FC-C268265BF9BA}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{A0B92A73-4167-4B87-99FC-C268265BF9BA}.Release|Any CPU.Build.0 = Release|Any CPU
+		{12B60EC7-349B-4B54-B27C-E1F3551E2FDB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{12B60EC7-349B-4B54-B27C-E1F3551E2FDB}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{12B60EC7-349B-4B54-B27C-E1F3551E2FDB}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{12B60EC7-349B-4B54-B27C-E1F3551E2FDB}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE