def tearDown(self):
    'See unittest.TestCase.tearDown for full specification.\n\n    Overriding implementations must call this implementation.\n    '
    self._invoker = None
    self.implementation.destantiate(self._memo)
    self._digest_pool.shutdown(wait=True)
See unittest.TestCase.tearDown for full specification.

Overriding implementations must call this implementation.
def tearDown(self):
    'See unittest.TestCase.tearDown for full specification.\n\n    Overriding implementations must call this implementation.\n    '
    self._invoker = None
    self.implementation.destantiate(self._memo)
    self._digest_pool.shutdown(wait=True)