code: def test_Init(self) -> None:
      self.assertEqual(
          self.t.trial_level_map,
          {"TRIAL_PARAM": {i: str(i) for i in range(3)}},
      )
      self.assertEqual(
          self.t.inverse_map, {str(i): i for i in range(3)}
      )
      self.assertEqual(self.t.target_values, {"TRIAL_PARAM": "0"})
      self.assertEqual(self.t2.trial_level_map, self.bm)
      self.assertIsNone(self.t2.inverse_map)
      self.assertEqual(
          self.t2.target_values, {"bp1": "v1", "bp2": "u1"}
      )
      # check that strings were converted to integers
      self.assertEqual(self.t4.trial_level_map, self.bm)
      self.assertIsNone(self.t4.inverse_map)
      self.assertEqual(
          self.t4.target_values, {"bp1": "v3", "bp2": "u2"}
      )
      # Test validation
      obsf = ObservationFeatures({"x": 2})
      obs = Observation(
          data=ObservationData([], np.array([]), np.empty((0, 0))),
          features=obsf,
      )
      with self.assertRaises(ValueError):
          TrialAsTask(
              search_space=self.search_space,
              observations=self.training_obs + [obs],
          )
      bm = {"p": {0: "x1", 1: "x2"}}
      with self.assertRaises(ValueError):
          TrialAsTask(
              search_space=self.search_space,
              observations=self.training_obs,
              config={"trial_level_map": bm},
          )
  
file_path: Ax/ax/modelbridge/transforms/tests/test_trial_as_task_transform.py
imports: from copy import deepcopy
  import numpy
  from ax.core.observation import Observation, ObservationData, ObservationFeatures
  from ax.core.parameter import ChoiceParameter, ParameterType, RangeParameter
  from ax.core.search_space import SearchSpace
  from ax.exceptions.core import UnsupportedError
  from ax.modelbridge.transforms.trial_as_task import TrialAsTask
  from ax.utils.common.testutils import TestCase
  from ax.utils.testing.core_stubs import get_robust_search_space
label_desc: Use image node_id 2 for calling the TrialAsTaskTransformTest obj's underlying member method code with example usage: obj.test_Init() without return types