def test_simpleUNIX(self):
        """
        L{endpoints._parseServer} returns a C{'UNIX'} port description with
        defaults for C{'mode'}, C{'backlog'}, and C{'wantPID'} when passed a
        string with the C{'unix:'} prefix and no other parameter values.
        """
        self.assertEqual(
            self.parse('unix:/var/run/finger', self.f),
            ('UNIX', ('/var/run/finger', self.f),
             {'mode': 0o666, 'backlog': 50, 'wantPID': True}))

        L{endpoints._parseServer} returns a C{'UNIX'} port description with
        defaults for C{'mode'}, C{'backlog'}, and C{'wantPID'} when passed a
        string with the C{'unix:'} prefix and no other parameter values.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/test/test_endpoints.py