- Added Google OAuth controller and service to handle authentication via Google.
- Introduced DTOs for Google user and token responses.
- Updated AuthService and UsersService traits to support new Google OAuth functionality.
- Implemented logic to create a new user if they do not exist in the system after Google authentication.
- Enhanced existing user retrieval and JWT generation upon successful login.
- Added tests for Google OAuth flow, including login redirection and callback handling for both new and existing users.
- Updated environment configuration to include Google OAuth credentials.
- Implemented tests for creating, retrieving, updating, and deleting mentors in `mentor_repository_test.rs`.
- Added tests for user authentication, including successful login, invalid email formats, and inactive users in `auth_login_tests.rs`.
- Created a mock test environment setup in `mock_test.rs` to facilitate database operations during tests.
- Updated module structure to include new test files for mentors and authentication.
- Ensured cleanup of the database after tests to maintain isolation and prevent side effects.
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