Refactor test files for improved readability and consistency

- 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.

app/services/extraction_processor.py

@@ -46,9 +46,9 @@ class ExtractionProcessor:
         if self.processor_task and not self.processor_task.done():
             try:
                 await asyncio.wait_for(self.processor_task, timeout=30.0)
-            except asyncio.TimeoutError:
+            except TimeoutError:
                 logger.warning(
-                    "Extraction processor did not stop gracefully, cancelling..."
+                    "Extraction processor did not stop gracefully, cancelling...",
                 )
                 self.processor_task.cancel()
                 try:
@@ -66,7 +66,7 @@ class ExtractionProcessor:
                 # The processor will pick it up on the next cycle
             else:
                 logger.warning(
-                    "Extraction %d is already being processed", extraction_id
+                    "Extraction %d is already being processed", extraction_id,
                 )
 
     async def _process_queue(self) -> None:
@@ -81,7 +81,7 @@ class ExtractionProcessor:
                 try:
                     await asyncio.wait_for(self.shutdown_event.wait(), timeout=5.0)
                     break  # Shutdown requested
-                except asyncio.TimeoutError:
+                except TimeoutError:
                     continue  # Continue processing
 
             except Exception as e:
@@ -90,7 +90,7 @@ class ExtractionProcessor:
                 try:
                     await asyncio.wait_for(self.shutdown_event.wait(), timeout=10.0)
                     break  # Shutdown requested
-                except asyncio.TimeoutError:
+                except TimeoutError:
                     continue
 
         logger.info("Extraction queue processor stopped")
@@ -125,13 +125,13 @@ class ExtractionProcessor:
 
                     # Start processing this extraction in the background
                     task = asyncio.create_task(
-                        self._process_single_extraction(extraction_id)
+                        self._process_single_extraction(extraction_id),
                     )
                     task.add_done_callback(
                         lambda t, eid=extraction_id: self._on_extraction_completed(
                             eid,
                             t,
-                        )
+                        ),
                     )
 
                     logger.info(