def test_parseStreamServerUNIX(self):
        """
        A UNIX domain socket can be specified using the string C{"UNIX"}.
        """
        try:
            from socket import AF_UNIX
        except ImportError:
            raise unittest.SkipTest("Platform lacks AF_UNIX support")
        else:
            self._parseStreamServerTest(AF_UNIX, "UNIX")

        A UNIX domain socket can be specified using the string C{"UNIX"}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/test/test_endpoints.py