diff --git a/tests/unit/test_ai_avatar_render_service.py b/tests/unit/test_ai_avatar_render_service.py
index a23ac997d..62cf82691 100644
--- a/tests/unit/test_ai_avatar_render_service.py
+++ b/tests/unit/test_ai_avatar_render_service.py
@@ -549,13 +549,16 @@ class TestAiAvatarRenderService:
             patch.object(svc, "_upload_to_oss", side_effect=lambda path, key: f"https://oss/{key}"),
             patch("os.system", return_value=0),
             patch("tempfile.TemporaryDirectory") as tmpdir_mock,
-            patch("app.services.ai_avatar_cover_service.generate_smart_cover", return_value="https://oss/smart_cover.jpg"),
+            patch(
+                "app.services.ai_avatar_cover_service.generate_smart_cover", return_value="https://oss/smart_cover.jpg"
+            ),
             patch("packages.domain.generated_video.GeneratedVideo.create") as gv_create,
             patch(
                 "packages.adapters.sqlalchemy_impl.generated_video_repository.SQLAlchemyGeneratedVideoRepository"
             ) as repo_cls,
         ):
             import tempfile as _tf
+
             tmpdir_mock.return_value.__enter__ = MagicMock(return_value="/tmp/testdir")
             tmpdir_mock.return_value.__exit__ = MagicMock(return_value=False)
 
@@ -604,8 +607,7 @@ class TestAiAvatarRenderService:
             patch.object(svc, "_upload_to_oss", side_effect=lambda path, key: f"https://oss/{key}"),
             patch("os.system", return_value=0),
             patch("tempfile.TemporaryDirectory") as tmpdir_mock,
-            patch("app.services.ai_avatar_cover_service.generate_smart_cover",
-                  side_effect=RuntimeError("DB error")),
+            patch("app.services.ai_avatar_cover_service.generate_smart_cover", side_effect=RuntimeError("DB error")),
         ):
             tmpdir_mock.return_value.__enter__ = MagicMock(return_value="/tmp/testdir")
             tmpdir_mock.return_value.__exit__ = MagicMock(return_value=False)