code: def test_dynamic_child_mocks_are_threading_mocks(self):
      waitable_mock = self._make_mock()
      self.assertIsInstance(waitable_mock.child, ThreadingMock)
  
imports: import time
  import unittest
  import concurrent.futures
  from test.support import threading_helper
  from unittest.mock import patch, ThreadingMock
label_desc: Use image node_id 9 for calling the TestThreadingMock obj's underlying member method code with example usage: obj.test_dynamic_child_mocks_are_threading_mocks() without return types