code: def test_slurm_missing_node_list() -> None:
      with with_slurm_job_nodelist("") as env:
          assert [env.hostname] == env.hostnames
  
imports: import contextlib
  import os
  import signal
  import subprocess
  import typing
  from pathlib import Path
  from unittest.mock import patch
  import pytest
  import submitit
  from ..None import helpers
  from ..core import job_environment, submission, test_core, utils
  from ..core.core import Job
  from .None import slurm
label_desc: Use image node_id 30 for calling a global function with example usage: test_slurm_missing_node_list() without return types