def test_nextProtocolMechanismsNPNIsSupported(self):
        """
        When at least NPN is available on the platform, NPN is in the set of
        supported negotiation protocols.
        """
        supportedProtocols = sslverify.protocolNegotiationMechanisms()
        self.assertTrue(
            sslverify.ProtocolNegotiationSupport.NPN in supportedProtocols
        )

        When at least NPN is available on the platform, NPN is in the set of
        supported negotiation protocols.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/test/test_sslverify.py