Update tests/utils/test_artifact.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: kevinlu310

tests/utils/test_artifact.py

@@ -180,7 +180,7 @@ def test_generated_id_comes_from_uuid4(self, mock_uuid4):
         mock_uuid = uuid.UUID('abcdef12-1234-5678-1234-567812345678')
         mock_uuid4.return_value = mock_uuid
         streamer = ArtifactStreamer(self.context_id, self.task_id)
-        self.assertEqual(streamer.artifact_id, str(mock_uuid))
+        self.assertEqual(streamer._artifact_id, str(mock_uuid))
 
     def test_default_name_is_response(self):
         streamer = ArtifactStreamer(self.context_id, self.task_id)