feat: Apply Unit Tests

[taiphanvan2k3]

Summary by CodeRabbit

Tests

• Comprehensive unit test suite added covering authentication flows (login, registration, token refresh)
• User profile and avatar management tests included
• Conversation and message deletion scenarios covered
• Validation and behavior pipeline tests implemented
• Test infrastructure and configuration established for application layer

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[coderabbitai]

Walkthrough

Comprehensive unit test suite added for the Application layer, introducing test projects and 14+ test files covering handlers, validators, and behaviors for Auth, User, Conversation, and Message features using xUnit, Moq, and FluentAssertions.

Changes

Cohort / File(s)	Change Summary
Solution and Project Structure LegalAssistant.AppService.sln, tests/Application.UnitTests/LegalAssistant.Application.UnitTests.csproj	Added "tests" folder project and "LegalAssistant.Application.UnitTests" test project to solution with proper configuration mappings and project references.
Behavior Tests tests/Application.UnitTests/Common/Behaviors/LoggingBehaviorTests.cs, tests/Application.UnitTests/Common/Behaviors/ValidationBehaviorTests.cs	Added unit tests for LoggingBehavior (success/failure logging, execution time measurement) and ValidationBehavior (no validators, valid/invalid requests, multiple validators).
Auth Feature Tests - Handlers tests/Application.UnitTests/Features/Auth/Login/LoginCommandHandlerTests.cs, tests/Application.UnitTests/Features/Auth/Register/RegisterCommandHandlerTests.cs, tests/Application.UnitTests/Features/Auth/RefreshAccessToken/RefreshAccessTokenCommandHandlerTests.cs	Added handler tests for Login (valid credentials, invalid email/password, deactivated user, RememberMe), Register (valid creation, email conflict, identity failure, avatar generation), and RefreshAccessToken (valid token, revoked token).
Auth Feature Tests - Validators tests/Application.UnitTests/Features/Auth/Login/LoginCommandValidatorTests.cs, tests/Application.UnitTests/Features/Auth/Register/RegisterCommandValidatorTests.cs	Added validator tests for Login (email/password validation, format checks) and Register (email, names, password matching validation).
User Feature Tests - Handlers and Validators tests/Application.UnitTests/Features/User/GetProfileQueryHandlerTests.cs, tests/Application.UnitTests/Features/User/UpdateProfile/UpdateProfileCommandHandlerTests.cs, tests/Application.UnitTests/Features/User/UpdateProfile/UpdateProfileValidatorTests.cs	Added tests for GetProfileQuery (valid user, unauthenticated, not found, external logins) and UpdateProfile handler (full name update, avatar upload, authorization checks) and validator (avatar content type validation).
Conversation and Message Tests tests/Application.UnitTests/Features/Conversation/Delete/DeleteConversationCommandHandlerTests.cs, tests/Application.UnitTests/Features/Message/DeleteMessageCommandHandlerTests.cs	Added deletion tests covering success paths, authorization, ownership verification, and not-found scenarios for conversations and messages.
Configuration and Documentation tests/Application.UnitTests/GlobalUsings.cs, tests/Application.UnitTests/IMPLEMENTATION_SUMMARY.md, tests/Application.UnitTests/README.md	Added global using directives, comprehensive implementation summary documenting test coverage and patterns, and README with setup instructions and testing guidelines.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~50 minutes

• Areas requiring attention:
  • Verify mock configurations are consistent across all test files and match the actual handler/validator signatures
  • Ensure all test scenarios cover both happy paths and error cases adequately
  • Check that assertions in each test file properly validate both success/failure states and repository/service interactions
  • Review the project structure setup in the solution file to confirm proper nesting and configuration mappings

Poem

🐰 Hopping through the test thicket,
With mocks and assertions so ticket,
From auth to deletion, each case we test,
Handlers and validators standing their best!
Comprehensive coverage, now that's quite neat,
Our unit tests make the codebase complete! 🎉

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Free

📥 Commits

Reviewing files that changed from the base of the PR and between 5563199 and 57b882f.

📒 Files selected for processing (17)

• LegalAssistant.AppService.sln (2 hunks)
• tests/Application.UnitTests/Common/Behaviors/LoggingBehaviorTests.cs (1 hunks)
• tests/Application.UnitTests/Common/Behaviors/ValidationBehaviorTests.cs (1 hunks)
• tests/Application.UnitTests/Features/Auth/Login/LoginCommandHandlerTests.cs (1 hunks)
• tests/Application.UnitTests/Features/Auth/Login/LoginCommandValidatorTests.cs (1 hunks)
• tests/Application.UnitTests/Features/Auth/RefreshAccessToken/RefreshAccessTokenCommandHandlerTests.cs (1 hunks)
• tests/Application.UnitTests/Features/Auth/Register/RegisterCommandHandlerTests.cs (1 hunks)
• tests/Application.UnitTests/Features/Auth/Register/RegisterCommandValidatorTests.cs (1 hunks)
• tests/Application.UnitTests/Features/Conversation/Delete/DeleteConversationCommandHandlerTests.cs (1 hunks)
• tests/Application.UnitTests/Features/Message/DeleteMessageCommandHandlerTests.cs (1 hunks)
• tests/Application.UnitTests/Features/User/GetProfileQueryHandlerTests.cs (1 hunks)
• tests/Application.UnitTests/Features/User/UpdateProfile/UpdateProfileCommandHandlerTests.cs (1 hunks)
• tests/Application.UnitTests/Features/User/UpdateProfile/UpdateProfileValidatorTests.cs (1 hunks)
• tests/Application.UnitTests/GlobalUsings.cs (1 hunks)
• tests/Application.UnitTests/IMPLEMENTATION_SUMMARY.md (1 hunks)
• tests/Application.UnitTests/LegalAssistant.Application.UnitTests.csproj (1 hunks)
• tests/Application.UnitTests/README.md (1 hunks)

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