Add comprehensive tests for player API endpoints and player service functionality

- 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.

tests/services/test_extraction.py

@@ -329,6 +329,10 @@ class TestExtractionService:
             hash="test_hash",
             is_normalized=False,
         )
+        sound_id = 1
+
+        # Mock sound repository to return the sound
+        extraction_service.sound_repo.get_by_id = AsyncMock(return_value=sound)
 
         mock_normalizer = Mock()
         mock_normalizer.normalize_sound = AsyncMock(
@@ -340,7 +344,8 @@ class TestExtractionService:
             return_value=mock_normalizer,
         ):
             # Should not raise exception
-            await extraction_service._normalize_sound(sound)
+            await extraction_service._normalize_sound(sound_id)
+            extraction_service.sound_repo.get_by_id.assert_called_once_with(sound_id)
             mock_normalizer.normalize_sound.assert_called_once_with(sound)
 
     @pytest.mark.asyncio
@@ -356,6 +361,10 @@ class TestExtractionService:
             hash="test_hash",
             is_normalized=False,
         )
+        sound_id = 1
+
+        # Mock sound repository to return the sound
+        extraction_service.sound_repo.get_by_id = AsyncMock(return_value=sound)
 
         mock_normalizer = Mock()
         mock_normalizer.normalize_sound = AsyncMock(
@@ -367,7 +376,8 @@ class TestExtractionService:
             return_value=mock_normalizer,
         ):
             # Should not raise exception even on failure
-            await extraction_service._normalize_sound(sound)
+            await extraction_service._normalize_sound(sound_id)
+            extraction_service.sound_repo.get_by_id.assert_called_once_with(sound_id)
             mock_normalizer.normalize_sound.assert_called_once_with(sound)
 
     @pytest.mark.asyncio