def test_hostnameEndpointConstruction(self):
        """
        A L{HostnameEndpoint} is constructed from parameters passed to
        L{clientFromString}.
        """
        reactor = object()
        endpoint = endpoints.clientFromString(
            reactor,
            nativeString(
                'tls:example.com:443:timeout=10:bindAddress=127.0.0.1'))
        hostnameEndpoint = endpoint._wrappedEndpoint
        self.assertIs(hostnameEndpoint._reactor, reactor)
        self.assertEqual(hostnameEndpoint._hostBytes, b'example.com')
        self.assertEqual(hostnameEndpoint._port, 443)
        self.assertEqual(hostnameEndpoint._timeout, 10)
        self.assertEqual(hostnameEndpoint._bindAddress,
                         nativeString('127.0.0.1'))

        A L{HostnameEndpoint} is constructed from parameters passed to
        L{clientFromString}.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/internet/test/test_endpoints.py