code: def setup_method(self):
      from airflow.hooks.filesystem import FSHook
  
      hook = FSHook()
      args = {"owner": "airflow", "start_date": DEFAULT_DATE}
      dag = DAG(
          TEST_DAG_ID + "test_schedule_dag_once", default_args=args
      )
      self.hook = hook
      self.dag = dag
  
imports: from __future__ import annotations
  import os
  import shutil
  import tempfile
  import pytest
  from airflow.exceptions import AirflowSensorTimeout
  from airflow.models.dag import DAG
  from airflow.sensors.filesystem import FileSensor
  from airflow.utils.timezone import datetime
label_desc: Use image node_id 1 for calling the TestFileSensor obj's underlying member method code with example usage: obj.setup_method() without return types