code: def setUp(self):
      # concurrent.futures uses a __getattr__ hook. Its __all__ triggers
      # import of a submodule, which fails when _multiprocessing is not
      # available.
      if _multiprocessing is None:
          sys.modules["_multiprocessing"] = types.ModuleType(
              "_multiprocessing"
          )
  
file_path: cpython/Lib/test/test___all__.py
imports: import unittest
  from test import support
  from test.support import warnings_helper
  import os
  import sys
  import types
label_desc: Use image node_id 1 for calling the AllTest obj's underlying member method code with example usage: obj.setUp() without return types