code: def test_marking_operator_as_teardown_task(self, dag_maker):
      with dag_maker() as dag:
          BashOperator(
              task_id="mytask", bash_command='echo "I am a setup task"'
          ).as_teardown()
  
      assert len(dag.task_group.children) == 1
      teardown_task = dag.task_group.children["mytask"]
      assert teardown_task.is_teardown
  
imports: from __future__ import annotations
  import pytest
  from airflow.decorators import setup, task, task_group, teardown
  from airflow.decorators.setup_teardown import context_wrapper
  from airflow.exceptions import AirflowException
  from airflow.operators.bash import BashOperator
label_desc: Use image node_id 6 for calling the TestSetupTearDownTask obj's underlying member method code with example usage: obj.test_marking_operator_as_teardown_task(dag_maker) without return types