diff --git a/tests/unit/domain/test_subtitle.py b/tests/unit/domain/test_subtitle.py
index 16f506064..c5f9fa6da 100755
--- a/tests/unit/domain/test_subtitle.py
+++ b/tests/unit/domain/test_subtitle.py
@@ -1,7 +1,6 @@
 """subtitle 字幕时间轴领域模型单测."""
 
 import pytest
-
 from domain.subtitle import SubtitleSegment, SubtitleTimeline, SubtitleWord
 
 # ── SubtitleWord ─────────────────────────────────────────────────────────────