@Override
	protected MessageBus getMessageBus() {
		if (testMessageBus == null) {
			testMessageBus = new RabbitTestMessageBus(rabbitAvailableRule.getResource(), getCodec());
		}
		return testMessageBus;
	}
@author Gary Russell
@author David Turanski
spring-xd-dirt/src/test/java/org/springframework/xd/dirt/plugins/job/RabbitJobPluginTests.java