code: def _submitit_command_str(self) -> str:
      return "echo 1"
  
imports: import contextlib
  import pickle
  import subprocess
  import sys
  import time
  import typing
  from pathlib import Path
  from unittest.mock import patch
  import pytest
  from .None import core, submission, utils
label_desc: Use image node_id 1 for calling the FakeExecutor obj's underlying member method code with example usage: obj._submitit_command_str() and returns: str