@Override
			protected boolean doSend(Message<?> message, long timeout) {
				tapThread.set(Thread.currentThread());
				tapped.countDown();
				throw new RuntimeException("bang");
			}
@author Gary Russell
@author David Turanski
@since 1.0
spring-xd-dirt/src/test/java/org/springframework/xd/dirt/integration/bus/local/LocalMessageBusTests.java