code: def _before_run(self, runner, pipeline, context):
      context["foo"] = 42
      self._test_case.assertEqual(runner.bar, "baz")
      self._test_case.assertEqual(
          self._context[self.PIPELINE_NAME], _PIPELINE_NAME
      )
  
imports: from unittest import mock
  from absl.testing import parameterized
  import tensorflow
  from tfx.dsl.compiler import compiler
  from tfx.orchestration import pipeline
  from tfx.orchestration import tfx_runner
  from tfx.tools.cli.handler import dag_runner_patcher
label_desc: Use image node_id 3 for calling the _DummyDagRunnerPatcher obj's underlying member method code with example usage: obj._before_run(runner, pipeline, context) without return types