diff --git a/tests/unit/test_unified_render_service.py b/tests/unit/test_unified_render_service.py
index d586762f0..c25d952d9 100755
--- a/tests/unit/test_unified_render_service.py
+++ b/tests/unit/test_unified_render_service.py
@@ -2314,7 +2314,7 @@ class TestVoiceoverTopLevelConfigBridge:
 
         assert result is True, "顶层 voice_id + custom_text 应触发 TTS 配音"
         # 应有 audio 图层
-        audio_layer = next((l for layer in layers if l.role == "audio"), None)
+        audio_layer = next((layer for layer in layers if layer.role == "audio"), None)
         assert audio_layer is not None, "应添加 audio 图层"
         assert len(audio_layer.clips) == 1, "应有 1 个配音片段"
 
@@ -2395,7 +2395,7 @@ class TestVoiceoverTopLevelConfigBridge:
 
         assert result is False
         # 没有 audio 图层
-        assert not any(l.role == "audio" for layer in layers)
+        assert not any(layer.role == "audio" for layer in layers)
 
 
 class TestVoiceoverSubtitleAlign:
@@ -2475,7 +2475,7 @@ class TestVoiceoverSubtitleAlign:
         # 应调用字幕对齐模式
         mock_sub_vo.assert_called_once()
         # 应有 audio 图层
-        audio_layer = next((l for layer in layers if l.role == "audio"), None)
+        audio_layer = next((layer for layer in layers if layer.role == "audio"), None)
         assert audio_layer is not None
         assert len(audio_layer.clips) == 2  # 2 个字幕对应 2 段配音
 
@@ -2505,7 +2505,7 @@ class TestVoiceoverSubtitleAlign:
             result = svc._maybe_add_voiceover_layer(layers, video_duration=10.0)
 
         assert result is False
-        assert not any(l.role == "audio" for layer in layers)
+        assert not any(layer.role == "audio" for layer in layers)
 
     def test_preset_voice_no_asr_service_no_trigger(self):
         """有 voice_id + 自动字幕但没有 ASR 服务 → 不触发。"""