code: def test_raw_data_is_not_dict_of_dicts(self) -> None:
      with self.assertRaisesRegex(
          UserInputError,
          "Raw data is expected to be just for one arm.",
      ):
          raw_data_to_evaluation(
              # pyre-fixme[6]: For 1st param expected `Union[Dict[str, Union[Tuple[...
              raw_data={"arm_0": {"objective_a": 6}},
              metric_names=["objective_a"],
          )
  
file_path: Ax/ax/core/tests/test_formatting_utils.py
imports: from ax.core.formatting_utils import raw_data_to_evaluation
  from ax.exceptions.core import UserInputError
  from ax.utils.common.testutils import TestCase
label_desc: Use image node_id 1 for calling the TestRawDataToEvaluation obj's underlying member method code with example usage: obj.test_raw_data_is_not_dict_of_dicts() without return types