code: def setup_dagbag(self, monkeypatch):
      # Adds a path to sys.path to simulate running the current script with `PYTHONPATH` env variable set.
      monkeypatch.syspath_prepend(TEST_UTILS_FOLDER)
      self.dagbag = self.get_dagbag(TEST_DAG_CORRUPTED_FOLDER)
      monkeypatch.undo()
      yield
  
imports: from __future__ import annotations
  import contextlib
  import logging
  import os
  import subprocess
  import sys
  import tempfile
  from pathlib import Path
  import pytest
  from airflow.configuration import conf
  from airflow.jobs.backfill_job_runner import BackfillJobRunner
  from airflow.jobs.job import Job, run_job
  from airflow.models import DagBag, DagRun, TaskInstance
  from airflow.utils.db import add_default_pool_if_not_exists
  from airflow.utils.state import State
  from airflow.utils.timezone import datetime
  from airflow.utils.types import DagRunType
  from tests.test_utils import db
label_desc: Use image node_id 1 for calling the TestImpersonationWithCustomPythonPath obj's underlying member method code with example usage: obj.setup_dagbag(monkeypatch) without return types