code: def test_TransformObservationFeatures(self) -> None:
      obs_ft2 = deepcopy(self.observation_features)
      obs_ft2 = self.t.transform_observation_features(obs_ft2)
      self.assertEqual(obs_ft2, self.transformed_features)
      obs_ft2 = self.t.untransform_observation_features(obs_ft2)
      self.assertEqual(obs_ft2, self.observation_features)
  
file_path: Ax/ax/modelbridge/transforms/tests/test_search_space_to_choice_transform.py
imports: from copy import deepcopy
  import numpy
  from ax.core.arm import Arm
  from ax.core.observation import Observation, ObservationData, ObservationFeatures
  from ax.core.parameter import ChoiceParameter, FixedParameter, ParameterType, RangeParameter
  from ax.core.search_space import SearchSpace
  from ax.exceptions.core import UnsupportedError
  from ax.modelbridge.transforms.search_space_to_choice import SearchSpaceToChoice
  from ax.utils.common.testutils import TestCase
  from ax.utils.testing.core_stubs import get_robust_search_space
label_desc: Use image node_id 4 for calling the SearchSpaceToChoiceTest obj's underlying member method code with example usage: obj.test_TransformObservationFeatures() without return types