code: def is_pure_service_node(self, pipeline_state, node_id) -> bool:
      raise NotImplementedError()
  
file_path: tfx/tfx/orchestration/experimental/core/env_test.py
imports: import tensorflow
  from tfx.orchestration.experimental.core import env
  from tfx.orchestration.experimental.core import test_utils
  from tfx.utils import status
label_desc: Use image node_id 5 for calling the _TestEnv obj's underlying member method code with example usage: obj.is_pure_service_node(pipeline_state, node_id) without return types