@Before public void setup() throws Exception {
  assumeTrue("Multicast does not seem to be working, skip!",multicastWorking);
  broker=createBroker();
  try {
    broker.start();
    broker.waitUntilStarted();
  }
 catch (  Exception e) {
    try {
      broker.stop();
    }
 catch (    Exception ignore) {
    }
    throw e;
  }
}