code: def test_error_during_startup(monkeypatch, nanny, loop):
      # see https://github.com/dask/distributed/issues/6320
      scheduler_port = open_port()
      scheduler_addr = f"tcp://127.0.0.1:{scheduler_port}"
  
      monkeypatch.setenv("DASK_SCHEDULER_ADDRESS", scheduler_addr)
      with popen(
          [
              "dask",
              "scheduler",
              f"--port={scheduler_port}",
              "--dashboard-address=:0",
          ],
      ):
          with Client(scheduler_addr, loop=loop) as c:
              with popen(
                  [
                      "dask",
                      "worker",
                      scheduler_addr,
                      nanny,
                      # This should clash due to a port conflict
                      f"--worker-port={scheduler_port}",
                  ],
              ) as worker:
                  assert worker.wait(10) == 1
  
imports: from __future__ import annotations
  import asyncio
  import os
  import signal
  import subprocess
  import sys
  from multiprocessing import cpu_count
  from time import sleep
  import pytest
  from click.testing import CliRunner
  from dask.utils import tmpfile
  from distributed import Client
  from distributed.cli.dask_worker import _apportion_ports, main
  from distributed.compatibility import LINUX, WINDOWS
  from distributed.deploy.utils import nprocesses_nthreads
  from distributed.metrics import time
  from distributed.utils import open_port
  from distributed.utils_test import gen_cluster, inc, popen, requires_ipv6, wait_for_log_line
label_desc: Use image node_id 8 for calling a global function with example usage: test_error_during_startup(monkeypatch, nanny, loop) without return types