- Added custom exceptions: DuplicateResourceException, EntityNotFoundException, AuthenticationFailedException, and BusinessRuleException to improve error handling in the application.
- Updated Program.cs to map these exceptions to appropriate HTTP status codes and problem details for better client feedback.
- Refactored RegisterUserCommandHandler to throw DuplicateResourceException when a user with the same email already exists.
- Enhanced testing setup in CustomWebApplicationFactory to ensure proper handling of these exceptions during functional tests.
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