code: def test_marking_external_python_task_as_teardown(
      self, dag_maker, venv_python
  ):
      @teardown
      @task.external_python(python=venv_python)
      def f():
          return 1
  
      with dag_maker() as dag:
          ret = f()
  
      assert len(dag.task_group.children) == 1
      teardown_task = dag.task_group.children["f"]
      assert teardown_task.is_teardown
      ret.operator.run(start_date=DEFAULT_DATE, end_date=DEFAULT_DATE)
  
imports: from __future__ import annotations
  import datetime
  import subprocess
  import venv
  from datetime import timedelta
  from pathlib import Path
  from subprocess import CalledProcessError
  from tempfile import TemporaryDirectory
  import pytest
  from airflow.decorators import setup, task, teardown
  from airflow.utils import timezone
label_desc: Use image node_id 9 for calling the TestExternalPythonDecorator obj's underlying member method code with example usage: obj.test_marking_external_python_task_as_teardown(dag_maker, venv_python) and returns: int