diff --git a/packages/shared/cover_frame_scorer.py b/packages/shared/cover_frame_scorer.py
index fe7c000e4..80de9c350 100644
--- a/packages/shared/cover_frame_scorer.py
+++ b/packages/shared/cover_frame_scorer.py
@@ -41,6 +41,7 @@ def score_frame(frame: "np.ndarray") -> float:
     try:
         import cv2
         import numpy as np
+
         # 确保 cv2 和 numpy 是真实的模块，不是 mock 对象
         # MagicMock 会有所有属性，但调用结果不是真实数值类型
         if not hasattr(cv2, "Laplacian") or not hasattr(np, "ndarray"):
diff --git a/tests/unit/test_cover_frame_scorer.py b/tests/unit/test_cover_frame_scorer.py
index 786babd1c..7e2fe0d9c 100644
--- a/tests/unit/test_cover_frame_scorer.py
+++ b/tests/unit/test_cover_frame_scorer.py
@@ -21,7 +21,7 @@ def _cv2_available() -> bool:
     try:
         import cv2
         import numpy as np
-        
+
         if not hasattr(cv2, "Laplacian") or not inspect.isroutine(cv2.Laplacian):
             return False
         if "mock" in str(type(cv2.Laplacian)).lower():