def _reprTest(self, serverFactory, factoryName):
        """
        Test the C{__str__} and C{__repr__} implementations of a UNIX port when
        used with the given factory.
        """
        filename = self.mktemp()
        unixPort = reactor.listenUNIX(filename, serverFactory)

        connectedString = "<%s on %r>" % (factoryName, filename)
        self.assertEqual(repr(unixPort), connectedString)
        self.assertEqual(str(unixPort), connectedString)

        d = defer.maybeDeferred(unixPort.stopListening)
        def stoppedListening(ign):
            unconnectedString = "<%s (not listening)>" % (factoryName,)
            self.assertEqual(repr(unixPort), unconnectedString)
            self.assertEqual(str(unixPort), unconnectedString)
        d.addCallback(stoppedListening)
        return d

        Test the C{__str__} and C{__repr__} implementations of a UNIX port when
        used with the given factory.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_unix.py