code: def testLatestPolicyModelOpTest_LatestTrainedModel(self):
      actual = self._latest_policy_model(_LATEST_EXPORTED)
      self.assertArtifactMapsEqual(actual, {"model": [self.model_3]})
  
imports: from typing import Dict, List, Optional
  from absl.testing import parameterized
  import tensorflow
  from tfx import types
  from tfx.dsl.input_resolution import resolver_op
  from tfx.dsl.input_resolution.ops import latest_policy_model_op
  from tfx.dsl.input_resolution.ops import ops
  from tfx.dsl.input_resolution.ops import test_utils
  from tfx.orchestration.portable.input_resolution import exceptions
  from ml_metadata.proto import metadata_store_pb2
label_desc: Use image node_id 8 for calling the LatestPolicyModelOpTest obj's underlying member method code with example usage: obj.testLatestPolicyModelOpTest_LatestTrainedModel() without return types