code: def testPopulateOutputArtifact(self):
      executor_output = execution_result_pb2.ExecutorOutput()
      output_dict = {"output_key": [standard_artifacts.Model()]}
      outputs_utils.populate_output_artifact(
          executor_output, output_dict
      )
      self.assertProtoEquals(
          """
          output_artifacts {
            key: "output_key"
            value {
              artifacts {
              }
            }
          }
          """,
          executor_output,
      )
  
imports: import os
  from unittest import mock
  from absl.testing import parameterized
  import tensorflow
  from tfx.dsl.io import fileio
  from tfx.orchestration import data_types_utils
  from tfx.orchestration.experimental.core import constants
  from tfx.orchestration.portable import data_types
  from tfx.orchestration.portable import outputs_utils
  from tfx.proto.orchestration import execution_result_pb2
  from tfx.proto.orchestration import pipeline_pb2
  from tfx.types import artifact
  from tfx.types import standard_artifacts
  from tfx.types.value_artifact import ValueArtifact
  from tfx.utils import test_case_utils
  from google.protobuf import text_format
  from ml_metadata.proto import metadata_store_pb2
label_desc: Use image node_id 16 for calling the OutputUtilsTest obj's underlying member method code with example usage: obj.testPopulateOutputArtifact() without return types