diff --git a/tests/unit/test_lipsync_routes.py b/tests/unit/test_lipsync_routes.py
index 2a8ad758b..3cba83375 100644
--- a/tests/unit/test_lipsync_routes.py
+++ b/tests/unit/test_lipsync_routes.py
@@ -730,6 +730,7 @@ class TestLipsyncRouteStaleRefresh:
     def test_stale_job_triggers_sync_refresh(self, mock_mediakit, mock_cosyvoice):
         """updated_at 超过 30 秒 → 同步调用 svc.refresh_job_status，不走 background."""
         from datetime import datetime, timedelta, timezone
+
         from app.services.lipsync_service import LipsyncService
 
         mock_job = _make_mock_job(status="submitted")
@@ -755,6 +756,7 @@ class TestLipsyncRouteStaleRefresh:
     def test_fresh_job_uses_background_refresh(self, mock_mediakit, mock_cosyvoice):
         """updated_at 在 30 秒内 → 直接挂后台刷新，不阻塞."""
         from datetime import datetime, timezone
+
         from app.services.lipsync_service import LipsyncService
 
         mock_job = _make_mock_job(status="submitted")
@@ -792,6 +794,7 @@ class TestLipsyncRouteStaleRefresh:
     def test_sync_refresh_exception_falls_back_to_background(self, mock_mediakit, mock_cosyvoice):
         """同步刷新抛异常 → 捕获后 fallback 到 background.add_task，接口仍正常返回 job."""
         from datetime import datetime, timedelta, timezone
+
         from app.services.lipsync_service import LipsyncService
 
         mock_job = _make_mock_job(status="submitted")
@@ -813,8 +816,8 @@ class TestLipsyncRouteStaleRefresh:
     def test_job_not_found_raises_404(self, mock_mediakit, mock_cosyvoice):
         """svc.get_job 返回 None → 抛 HTTPException(404)."""
         import pytest
-        from fastapi import HTTPException
         from app.services.lipsync_service import LipsyncService
+        from fastapi import HTTPException
 
         mock_db = MagicMock()
         svc = LipsyncService(mock_db, client=mock_mediakit, cosyvoice_service=mock_cosyvoice)