code: def testConstructWithTunerFn(self):
      tuner = component.Tuner(
          examples=self.examples,
          transform_graph=self.transform_graph,
          train_args=self.train_args,
          eval_args=self.eval_args,
          tuner_fn="path.to.tuner_fn",
      )
      self._verify_output(tuner)
  
file_path: tfx/tfx/components/tuner/component_test.py
imports: import tensorflow
  from tfx.components.tuner import component
  from tfx.proto import trainer_pb2
  from tfx.proto import tuner_pb2
  from tfx.types import channel_utils
  from tfx.types import standard_artifacts
label_desc: Use image node_id 4 for calling the TunerTest obj's underlying member method code with example usage: obj.testConstructWithTunerFn() without return types