- Removed unnecessary blank lines and adjusted formatting in test files.
- Ensured consistent use of commas in function calls and assertions across various test cases.
- Updated import statements for better organization and clarity.
- Enhanced mock setups in tests for better isolation and reliability.
- Improved assertions to follow a consistent style for better readability.
- Implemented tests for player API endpoints including play, pause, stop, next, previous, seek, set volume, set mode, reload playlist, and get state.
- Added mock player service for testing API interactions.
- Created tests for player service methods including play, pause, stop playback, next, previous, seek, set volume, set mode, and reload playlist.
- Ensured proper handling of success, error, and edge cases in both API and service tests.
- Verified state management and serialization in player state tests.
