### Question:
MessageBus extends MBassador<IMessage> { public MessageBus() { super(createBusConfiguration()); } MessageBus();   }### Answer:
@Test public void testMessageBus() { TestListener listener = new TestListener(); messageBus.subscribe(listener); assertFalse(listener.messageReceived); messageBus.publish(new TestMessage()); assertTrue(listener.messageReceived); }