- Introduced `createTestApp` utility to standardize Express app creation for tests, including JSON parsing, mock logger, and error handling.
- Updated all route tests to utilize `createTestApp`, enhancing consistency and reducing boilerplate code.
- Implemented `mockLogger` for cleaner test output and easier logging mock management.
- Adjusted passport mocks to ensure proper user authentication simulation across tests.
- Enhanced type safety by augmenting Express Request interface with `req.log` and `req.user` properties.
- Removed redundant code and improved readability in various test files.