build(backend): add testing dependencies and update solution structure

Installed:
- Microsoft.NET.Test.Sdk
- Microsoft.Extensions.DependencyInjection
- xunit
- coverlet.collector
- FluentAssertions
- NSubstitute
- Bogus
- Testcontainers
- Microsoft.AspNetCore.Mvc.Testing

Author: cristofima

src/Directory.Packages.props

@@ -27,6 +27,7 @@
     <PackageVersion Include="Microsoft.EntityFrameworkCore.Tools" Version="10.0.0" />
     <!-- Microsoft Extensions -->
     <PackageVersion Include="Microsoft.Extensions.Configuration.Binder" Version="10.0.0" />
+    <PackageVersion Include="Microsoft.Extensions.DependencyInjection" Version="10.0.0" />
     <PackageVersion Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="10.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Http" Version="10.0.0" />
     <PackageVersion Include="Microsoft.Extensions.Logging.Abstractions" Version="10.0.0" />
@@ -36,5 +37,18 @@
     <PackageVersion Include="Serilog.Sinks.Console" Version="6.1.1" />
     <!-- API Documentation -->
     <PackageVersion Include="Swashbuckle.AspNetCore" Version="10.0.1" />
+    <!-- Testing Framework -->
+    <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />
+    <PackageVersion Include="xunit" Version="2.9.3" />
+    <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />
+    <PackageVersion Include="coverlet.collector" Version="6.0.4" />
+    <!-- Testing Libraries -->
+    <PackageVersion Include="FluentAssertions" Version="8.8.0" />
+    <PackageVersion Include="NSubstitute" Version="5.3.0" />
+    <PackageVersion Include="Bogus" Version="35.6.1" />
+    <!-- Integration Testing -->
+    <PackageVersion Include="Testcontainers.MsSql" Version="4.4.0" />
+    <PackageVersion Include="Testcontainers.PostgreSql" Version="4.4.0" />
+    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.0" />
   </ItemGroup>
 </Project>

src/backend/TaskAgentWeb.sln

@@ -29,6 +29,14 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TaskAgent.ServiceDefaults",
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TaskAgent.WebApi", "services\TaskAgent\src\TaskAgent.WebApi\TaskAgent.WebApi.csproj", "{661CFFEE-5025-0961-C580-3918913EF67F}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "tests", "tests", "{0B58EC9C-C381-40B6-99DA-67F5BDA7AFAD}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TaskAgent.Domain.UnitTests", "services\TaskAgent\tests\TaskAgent.Domain.UnitTests\TaskAgent.Domain.UnitTests.csproj", "{F92E755F-8B65-4E59-92B7-2B2A62D5253F}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TaskAgent.Application.UnitTests", "services\TaskAgent\tests\TaskAgent.Application.UnitTests\TaskAgent.Application.UnitTests.csproj", "{7C4DB031-AE1C-4F03-B5D1-78B0FF5CDB41}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TaskAgent.Infrastructure.IntegrationTests", "services\TaskAgent\tests\TaskAgent.Infrastructure.IntegrationTests\TaskAgent.Infrastructure.IntegrationTests.csproj", "{3223362D-8F51-4441-9761-A08433E0DB72}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -59,6 +67,18 @@ Global
 		{661CFFEE-5025-0961-C580-3918913EF67F}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{661CFFEE-5025-0961-C580-3918913EF67F}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{661CFFEE-5025-0961-C580-3918913EF67F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{F92E755F-8B65-4E59-92B7-2B2A62D5253F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F92E755F-8B65-4E59-92B7-2B2A62D5253F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F92E755F-8B65-4E59-92B7-2B2A62D5253F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F92E755F-8B65-4E59-92B7-2B2A62D5253F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{7C4DB031-AE1C-4F03-B5D1-78B0FF5CDB41}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7C4DB031-AE1C-4F03-B5D1-78B0FF5CDB41}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7C4DB031-AE1C-4F03-B5D1-78B0FF5CDB41}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7C4DB031-AE1C-4F03-B5D1-78B0FF5CDB41}.Release|Any CPU.Build.0 = Release|Any CPU
+		{3223362D-8F51-4441-9761-A08433E0DB72}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3223362D-8F51-4441-9761-A08433E0DB72}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3223362D-8F51-4441-9761-A08433E0DB72}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3223362D-8F51-4441-9761-A08433E0DB72}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -70,6 +90,10 @@ Global
 		{7F05D7F7-D6A4-C7D3-E31B-FEDF15B216A8} = {1577855C-508A-4421-8F10-3C1A1D519C34}
 		{9F54222B-01A5-79FB-4D06-87DEBFC33C5F} = {1577855C-508A-4421-8F10-3C1A1D519C34}
 		{661CFFEE-5025-0961-C580-3918913EF67F} = {1577855C-508A-4421-8F10-3C1A1D519C34}
+		{0B58EC9C-C381-40B6-99DA-67F5BDA7AFAD} = {B815803B-6FC7-4C5E-9865-7EF42EB603E6}
+		{F92E755F-8B65-4E59-92B7-2B2A62D5253F} = {0B58EC9C-C381-40B6-99DA-67F5BDA7AFAD}
+		{7C4DB031-AE1C-4F03-B5D1-78B0FF5CDB41} = {0B58EC9C-C381-40B6-99DA-67F5BDA7AFAD}
+		{3223362D-8F51-4441-9761-A08433E0DB72} = {0B58EC9C-C381-40B6-99DA-67F5BDA7AFAD}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {51B9809D-BFB8-4AA5-90FB-CAACE318A41E}