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/sound_normalizer.py

@@ -141,7 +141,7 @@ class SoundNormalizerService:
             ffmpeg.run(stream, quiet=True, overwrite_output=True)
             logger.info("One-pass normalization completed: %s", output_path)
 
-        except Exception as e:
+        except Exception:
             logger.exception("One-pass normalization failed for %s", input_path)
             raise
 
@@ -153,7 +153,7 @@ class SoundNormalizerService:
         """Normalize audio using two-pass loudnorm for better quality."""
         try:
             logger.info(
-                "Starting two-pass normalization: %s -> %s", input_path, output_path
+                "Starting two-pass normalization: %s -> %s", input_path, output_path,
             )
 
             # First pass: analyze
@@ -193,7 +193,7 @@ class SoundNormalizerService:
             json_match = re.search(r'\{[^{}]*"input_i"[^{}]*\}', analysis_output)
             if not json_match:
                 logger.error(
-                    "Could not find JSON in loudnorm output: %s", analysis_output
+                    "Could not find JSON in loudnorm output: %s", analysis_output,
                 )
                 raise ValueError("Could not extract loudnorm analysis data")
 
@@ -260,7 +260,7 @@ class SoundNormalizerService:
                 )
                 raise
 
-        except Exception as e:
+        except Exception:
             logger.exception("Two-pass normalization failed for %s", input_path)
             raise
 
@@ -428,7 +428,7 @@ class SoundNormalizerService:
                     "type": sound.type,
                     "is_normalized": sound.is_normalized,
                     "name": sound.name,
-                }
+                },
             )
 
         # Process each sound using captured data
@@ -476,7 +476,7 @@ class SoundNormalizerService:
                         "normalized_hash": None,
                         "id": sound_id,
                         "error": str(e),
-                    }
+                    },
                 )
 
         logger.info("Normalization completed: %s", results)
@@ -517,7 +517,7 @@ class SoundNormalizerService:
                     "type": sound.type,
                     "is_normalized": sound.is_normalized,
                     "name": sound.name,
-                }
+                },
             )
 
         # Process each sound using captured data
@@ -565,7 +565,7 @@ class SoundNormalizerService:
                         "normalized_hash": None,
                         "id": sound_id,
                         "error": str(e),
-                    }
+                    },
                 )
 
         logger.info("Type normalization completed: %s", results)