code: def test_TransformSearchSpace(self) -> None:
      ss2 = self.search_space.clone()
      ss2 = self.t.transform_search_space(ss2)
      self.assertEqual(ss2.parameters.get("c"), None)
  
file_path: Ax/ax/modelbridge/transforms/tests/test_remove_fixed_transform.py
imports: from copy import deepcopy
  from ax.core.observation import ObservationFeatures
  from ax.core.parameter import ChoiceParameter, FixedParameter, ParameterType, RangeParameter
  from ax.core.search_space import RobustSearchSpace, SearchSpace
  from ax.modelbridge.transforms.remove_fixed import RemoveFixed
  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 RemoveFixedTransformTest obj's underlying member method code with example usage: obj.test_TransformSearchSpace() without return types