AddressPair addressPair = new AddressPair("localhost", connectPort, "localhost", freePort);
assertTrue(MultiplexServerInvoker.getAddressPairMap().containsKey(addressPair));
String callbackURI = "multiplex://localhost:" + freePort + "/?serverMultiplexId=id";
Connector callbackConnector = new Connector(callbackURI);
callbackConnector.start();
assertTrue(callbackConnector.isStarted());
assertTrue(callbackConnector.getServerInvoker().isStarted());
assertTrue(MultiplexServerInvoker.getSocketGroupMap().containsKey("id"));
assertTrue(MultiplexServerInvoker.getAddressPairMap().containsKey(addressPair));