code: def testConstructFromRunFn(self):
      run_fn = "path.to.my_run_fn"
      trainer = component.Trainer(
          run_fn=run_fn,
          custom_executor_spec=executor_spec.ExecutorClassSpec(
              executor.GenericExecutor
          ),
          examples=self.examples,
          transform_graph=self.transform_graph,
          train_args=self.train_args,
          eval_args=self.eval_args,
      )
      self._verify_outputs(trainer)
      self.assertEqual(
          run_fn,
          trainer.spec.exec_properties[
              standard_component_specs.RUN_FN_KEY
          ],
      )
  
imports: import tensorflow
  from tfx.components.trainer import component
  from tfx.components.trainer import executor
  from tfx.dsl.components.base import executor_spec
  from tfx.orchestration import data_types
  from tfx.proto import trainer_pb2
  from tfx.types import channel_utils
  from tfx.types import standard_artifacts
  from tfx.types import standard_component_specs
label_desc: Use image node_id 6 for calling the ComponentTest obj's underlying member method code with example usage: obj.testConstructFromRunFn() without return types