code: def setUp(self):
      self.test_dir = tempfile.mkdtemp(
          prefix=f"{self.__class__.__name__}_"
      )
      self.threadpool = ThreadPoolExecutor()
  
imports: import io
  import os
  import shutil
  import sys
  import tempfile
  import time
  import unittest
  from concurrent.futures import wait
  from concurrent.futures._base import ALL_COMPLETED
  from concurrent.futures.thread import ThreadPoolExecutor
  from typing import Dict, Set
  from unittest import mock
  from torch.distributed.elastic.multiprocessing.tail_log import TailLog
label_desc: Use image node_id 1 for calling the TailLogTest obj's underlying member method code with example usage: obj.setUp() without return types