{
int freePort = PortUtil.findFreePort("localhost");
String callbackURI = "multiplex://localhost:" + freePort;
callbackURI += "/?serverMultiplexId=id&multiplexConnectHost=localhost&multiplexConnectPort=" + connectPort;
Connector callbackConnector = new Connector(callbackURI);
callbackConnector.start();
assertTrue(callbackConnector.isStarted());
assertTrue(callbackConnector.getServerInvoker().isStarted());
assertTrue(MultiplexServerInvoker.getSocketGroupMap().containsKey("id"));
AddressPair addressPair = new AddressPair("localhost", connectPort, "localhost", freePort);