'The endpoint returns a connection to the IPv4 address.
IPv4 ought to be the first attempt, since nameResolution (standing in
for GAI here) returns it first. The IPv4 attempt succeeds, the
connection is established, and a Deferred fires with the protocol
constructed.'

def test_IPv4IsFaster(self):

    clientFactory = protocol.Factory()
    clientFactory.protocol = protocol.Protocol
    d = self.endpoint.connect(clientFactory)
    results = []
    d.addCallback(results.append)
    (host, port, factory, timeout, bindAddress) = self.mreactor.tcpClients[0]
    self.assertEqual(host, '1.2.3.4')
    self.assertEqual(port, 80)
    proto = factory.buildProtocol((host, port))
    fakeTransport = object()
    self.assertEqual(results, [])
    proto.makeConnection(fakeTransport)
    self.assertEqual(len(results), 1)
    self.assertEqual(results[0].factory, clientFactory)
    self.assertEqual([], self.mreactor.getDelayedCalls())
