- Fix missing imports and dependencies in email verification tests
- Update email verification service implementation
- Resolve test reference errors that were causing failures
- Improve error handling and test reliability
This fixes the 3 failing database service tests mentioned in the improvement summary.
- Restructure tests with better organization and describe blocks
- Add comprehensive test coverage for all service methods
- Test edge cases including expired tokens and database errors
- Add integration scenario tests for full verification flow
- Fix TypeScript issues with mock user creation
- Improve test isolation and mock management
- Add tests for unique token generation and error handling
