code: def setUp(self):
      super().setUp()
      self._test_channel = channel.Channel(type=_MyArtifactWithProperty)
  
imports: import os
  from absl.testing import parameterized
  from kfp.pipeline_spec import pipeline_spec_pb2
  import tensorflow
  from tfx.dsl.io import fileio
  from tfx.orchestration import data_types
  from tfx.orchestration.kubeflow.v2 import compiler_utils
  from tfx.types import artifact
  from tfx.types import channel
  from tfx.types import channel_utils
  from tfx.types import standard_artifacts
  from tfx.types.experimental import simple_artifacts
  import yaml
  from google.protobuf import text_format
label_desc: Use image node_id 1 for calling the PlaceholderToCELTest obj's underlying member method code with example usage: obj.setUp() without return types