def test_getSignalNameWithLocalSignal(self):
        """
        If there are signals in the signal module which aren't in the SSH RFC,
        we map their name to [signal name]@[platform].
        """
        signal.SIGTwistedTest = signal.NSIG + 1 # value can't exist normally
        # Force reinitialization of signals
        self.pp._signalValuesToNames = None
        self.assertEqual(self.pp._getSignalName(signal.SIGTwistedTest),
                          'SIGTwistedTest@' + sys.platform)

        If there are signals in the signal module which aren't in the SSH RFC,
        we map their name to [signal name]@[platform].
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/conch/test/test_session.py