pytest with multiprocessing & "--import-mode=importlib" EOFError #13690

    def test_funcInTestFile():
        p = multiprocessing.Process(target=sleepSomeTimeInTestFile)
>       p.start()

test_example.py:24: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
W:\Python38-64bit\lib\multiprocessing\process.py:121: in start
    self._popen = self._Popen(self)
W:\Python38-64bit\lib\multiprocessing\context.py:224: in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
W:\Python38-64bit\lib\multiprocessing\context.py:327: in _Popen
    return Popen(process_obj)
W:\Python38-64bit\lib\multiprocessing\popen_spawn_win32.py:93: in __init__
    reduction.dump(process_obj, to_child)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

obj = <Process name='Process-1' parent=19324 initial>
file = <_io.BufferedWriter name=5>, protocol = None

    def dump(obj, file, protocol=None):
        '''Replacement for pickle.dump() using ForkingPickler.'''
>       ForkingPickler(file, protocol).dump(obj)
E       _pickle.PicklingError: Can't pickle <function sleepSomeTimeInTestFile at 0x0000019EF622A3A0>: it's not the same object as test_example.sleepSomeTimeInTestFile

W:\Python38-64bit\lib\multiprocessing\reduction.py:60: PicklingError
  File "W:\Python38-64bit\lib\multiprocessing\spawn.py", line 116, in spawn_main
- generated xml file: C:\Users\DOMENJ~1.ISY\AppData\Local\Temp\tmp-1116815mH4iv3Rg16.xml -
    exitcode = _main(fd, parent_sentinel)