def test_loseConnectionPassThrough(self):
        """
        C{_BypassTLS.loseConnection} calls C{loseConnection} on the base
        class, while preserving any default argument in the base class'
        C{loseConnection} implementation.
        """
        default = object()
        result = []

        class FakeTransport(object):
            def loseConnection(self, _connDone=default):
                result.append(_connDone)

        bypass = _newtls._BypassTLS(FakeTransport, FakeTransport())

        # The default from FakeTransport is used:
        bypass.loseConnection()
        self.assertEqual(result, [default])

        # And we can pass our own:
        notDefault = object()
        bypass.loseConnection(notDefault)
        self.assertEqual(result, [default, notDefault])

        C{_BypassTLS.loseConnection} calls C{loseConnection} on the base
        class, while preserving any default argument in the base class'
        C{loseConnection} implementation.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/test/test_newtls.py