diff --git a/tests/unit/test_1294_preview_voice_injection.py b/tests/unit/test_1294_preview_voice_injection.py
index d647ced0c..c3ca78d3b 100644
--- a/tests/unit/test_1294_preview_voice_injection.py
+++ b/tests/unit/test_1294_preview_voice_injection.py
@@ -6,9 +6,10 @@
 3. voice_ids 正确注入到 plan config 中
 """
 
-import pytest
 from unittest.mock import MagicMock, patch
 
+import pytest
+
 
 class TestLoadTaskInfoVoiceIds:
     """验证 _load_task_info 包含 voice_ids"""
@@ -79,17 +80,19 @@ class TestRenderVideoVoiceInjection:
 
     def test_voice_ids_injected_into_plan_config(self):
         """voice_ids 非空时，voice_id 被注入到 plan config"""
-        from worker_app.tasks.generation import _render_video
         import inspect
 
+        from worker_app.tasks.generation import _render_video
+
         sig = inspect.signature(_render_video)
         assert "voice_ids" in sig.parameters
 
     def test_voice_ids_default_none(self):
         """voice_ids 参数默认为 None"""
-        from worker_app.tasks.generation import _render_video
         import inspect
 
+        from worker_app.tasks.generation import _render_video
+
         sig = inspect.signature(_render_video)
         param = sig.parameters["voice_ids"]
         assert param.default is None