Refactor test cases for improved readability and consistency

- Adjusted function signatures in various test files to enhance clarity by aligning parameters.
- Updated patching syntax for better readability across test cases.
- Improved formatting and spacing in test assertions and mock setups.
- Ensured consistent use of async/await patterns in async test functions.
- Enhanced comments for better understanding of test intentions.

app/services/extraction.py

@@ -156,7 +156,8 @@ class ExtractionService:
 
                 # Check if extraction already exists for this service
                 existing = await self.extraction_repo.get_by_service_and_id(
-                    service_info["service"], service_info["service_id"],
+                    service_info["service"],
+                    service_info["service_id"],
                 )
                 if existing and existing.id != extraction_id:
                     error_msg = (
@@ -181,7 +182,8 @@ class ExtractionService:
 
             # Extract audio and thumbnail
             audio_file, thumbnail_file = await self._extract_media(
-                extraction_id, extraction_url,
+                extraction_id,
+                extraction_url,
             )
 
             # Move files to final locations
@@ -227,7 +229,9 @@ class ExtractionService:
         except Exception as e:
             error_msg = str(e)
             logger.exception(
-                "Failed to process extraction %d: %s", extraction_id, error_msg,
+                "Failed to process extraction %d: %s",
+                extraction_id,
+                error_msg,
             )
         else:
             return {
@@ -262,7 +266,9 @@ class ExtractionService:
             }
 
     async def _extract_media(
-        self, extraction_id: int, extraction_url: str,
+        self,
+        extraction_id: int,
+        extraction_url: str,
     ) -> tuple[Path, Path | None]:
         """Extract audio and thumbnail using yt-dlp."""
         temp_dir = Path(settings.EXTRACTION_TEMP_DIR)