@Override
		protected void before() {
			if (testMessageBus == null || !(testMessageBus instanceof RedisTestMessageBus)) {
				testMessageBus = new RedisTestMessageBus(redisAvailableRule.getResource());
			}
		}
@author Mark Fisher
@author Gary Russell
spring-xd-dirt/src/test/java/org/springframework/xd/dirt/stream/RedisSingleNodeStreamDeploymentIntegrationTests.java