- Add authentication middleware tests for JWT validation
- Add library creation tests for admin authorization
- Add library visibility control tests
- Add user management and error handling tests
- Add JSON validation and security tests
- Add tests for both success and failure scenarios
- Test edge cases like missing tokens, invalid data, unauthorized access
- Use httptest for isolated API testing without needing running server
- Include comprehensive test coverage for security and functionality
Tests verify application security and multi-library system works correctly before deployment.
