✅ (test_youtube_transcript_component.py): update file_names_mapping f…

…ixture to return a non-empty list to properly test different versions of file names mapping in the YouTube transcripts component

src/backend/tests/unit/components/bundles/youtube/test_youtube_transcript_component.py

@@ -28,7 +28,8 @@ def default_kwargs(self):
     @pytest.fixture
     def file_names_mapping(self):
         """Return the file names mapping for different versions."""
-        return []
+        return [
+        ]
 
     @pytest.fixture
     def mock_transcript_data(self):