code: def testAirflowDagRunnerInitBackwardCompatible(self):
      airflow_config = {
          "schedule_interval": "* * * * *",
          "start_date": datetime.datetime(2019, 1, 1),
      }
  
      runner = airflow_dag_runner.AirflowDagRunner(airflow_config)
  
      self.assertEqual(
          airflow_config, runner._config.airflow_dag_config
      )
  
imports: import datetime
  from unittest import mock
  import tensorflow
  from tfx import types
  from tfx.dsl.components.base import base_component
  from tfx.dsl.components.base import base_executor
  from tfx.dsl.components.base import executor_spec
  from tfx.orchestration import pipeline
  from tfx.orchestration.airflow import airflow_dag_runner
  from tfx.orchestration.data_types import RuntimeParameter
  from tfx.types import component_spec
label_desc: Use image node_id 2 for calling the AirflowDagRunnerTest obj's underlying member method code with example usage: obj.testAirflowDagRunnerInitBackwardCompatible() without return types