- 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.
- Replaced direct API calls in useWatchedItems with useApi hook for add and remove watched items.
- Updated tests for useWatchedItems to mock useApi and verify API interactions.
- Consolidated error handling for API calls in useWatchedItems.
- Adjusted related hooks and components to ensure compatibility with the new structure.
- Added new ScaleIcon component for UI consistency.
- Implemented useFlyerItems and useFlyers hooks for fetching flyer data.
- Created useMasterItems and useUserData hooks for managing master grocery items and user data.
- Developed useInfiniteQuery hook for handling paginated API responses.
- Added comprehensive tests for useApi and useInfiniteQuery hooks.
- Introduced comparePrices API endpoint and corresponding client-side functionality.
