code: def create_dummy_file(filename, dir_path="/tmp"):
      os.makedirs(dir_path, exist_ok=True)
      full_path = os.path.join(dir_path, filename)
      with open(full_path, "wb") as f:
          f.write(os.urandom(1 * 1024 * 1024))
  
imports: from __future__ import annotations
  import contextlib
  import logging
  import os
  import shutil
  from datetime import datetime
  from pathlib import Path
  import pytest
  from airflow.configuration import AIRFLOW_HOME, AirflowConfigParser, get_airflow_config
  from airflow.exceptions import AirflowException
  from airflow.models.dagbag import DagBag
  from tests.test_utils import AIRFLOW_MAIN_FOLDER
  from tests.test_utils.logging_command_executor import get_executor
label_desc: Use image node_id 7 for calling the SystemTest obj's underlying member method code with example usage: obj.create_dummy_file(filename, dir_path) without return types