code: def test_timeout_none(self):
      if multi_process_runner.is_oss():
          self.skipTest("Intentionally skipping longer test in OSS.")
  
      def fn():
          time.sleep(250)
          raise ValueError("Worker 0 errored")
  
      mpr = multi_process_runner.MultiProcessRunner(
          fn, multi_worker_test_base.create_cluster_spec(num_workers=1)
      )
  
      mpr.start()
      with self.assertRaisesRegex(ValueError, "Worker 0 errored"):
          mpr.join(timeout=None)
  
imports: import ctypes
  import json
  import os
  import sys
  import threading
  import time
  import unittest
  from absl import logging
  from absl.testing import parameterized
  from tensorflow.python.distribute import combinations
  from tensorflow.python.distribute import multi_process_runner
  from tensorflow.python.distribute import multi_worker_test_base
  from tensorflow.python.eager import context
  from tensorflow.python.eager import test
label_desc: Use image node_id 26 for calling the MultiProcessRunnerTest obj's underlying member method code with example usage: obj.test_timeout_none() without return types