[TASK] Testing: Implement comprehensive authentication test suite

[sbusso]

Parent Feature

Related to feature #4

Task Description

Create a comprehensive test suite covering all authentication functionality including unit tests, integration tests, and end-to-end security testing.

Acceptance Criteria

• Unit tests for all authentication API endpoints
• Unit tests for frontend authentication components
• Integration tests for complete authentication flows
• Test coverage >90% for authentication code
• Security tests for common vulnerabilities (SQL injection, XSS)
• Performance tests for authentication operations (<200ms)
• End-to-end tests for user registration and login flows
• Test data setup and teardown procedures
• Mock email service for password reset testing
• Load testing for rate limiting functionality

Implementation Notes

• Use appropriate testing frameworks for backend and frontend
• Create realistic test data and scenarios
• Test both happy path and error conditions
• Include edge cases like malformed requests and boundary conditions
• Automate test execution in CI/CD pipeline

Definition of Done

• All tests implemented and passing consistently
• Test coverage metrics meet requirements (>90%)
• Performance benchmarks established and documented
• Security test results reviewed and approved
• Tests integrated into continuous integration
• Test documentation and maintenance procedures created

Dependencies

• Backend authentication implementation ([TASK] Backend: Implement user authentication database schema and core API endpoints #6)
• Frontend authentication implementation ([TASK] Frontend: Implement authentication forms and user state management #7)
• Security features implementation ([TASK] Security: Implement password reset and security hardening features #8)
• Testing infrastructure and tools setup

Area

Testing

Estimated Effort

Medium: 1-3 days