code: def test_multi_process_runner_queue_emptied_between_runs(self):
      cluster_spec = multi_worker_test_base.create_cluster_spec(
          num_workers=2
      )
      return_value = multi_process_runner.run(
          fn_that_adds_simple_return_data, cluster_spec
      ).return_value
      self.assertTrue(return_value)
      self.assertEqual(return_value[0], "dummy_data")
      self.assertEqual(return_value[1], "dummy_data")
      return_value = multi_process_runner.run(
          fn_that_does_nothing, cluster_spec
      ).return_value
      self.assertFalse(return_value)
  
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 4 for calling the MultiProcessRunnerTest obj's underlying member method code with example usage: obj.test_multi_process_runner_queue_emptied_between_runs() without return types