code: def test_validation_circular_ref() -> None:
      with pytest.raises(hip.ExperimentValidationCircularRef):
          hip.Experiment(
              datapoints=[
                  hip.Datapoint(uid="1", from_uid="2", values={}),
                  hip.Datapoint(uid="2", from_uid="3", values={}),
                  hip.Datapoint(uid="3", from_uid="4", values={}),
                  hip.Datapoint(uid="4", from_uid="2", values={}),
              ]
          ).validate()
  
imports: import tempfile
  import shutil
  from contextlib import contextmanager
  from unittest.mock import patch
  import typing
  import pytest
  import pandas
  import optuna
  import hiplot
label_desc: Use image node_id 9 for calling a global function with example usage: test_validation_circular_ref() without return types