//replace existing implementation for testing purposes
_testKit.removeService("GreetingService");
final MockHandler greetingService = _testKit.registerInOnlyService("GreetingService");
sentTextToQueue(PAYLOAD);
greetingService.waitForOKMessage();
final LinkedBlockingQueue<Exchange> receivedMessages = greetingService.getMessages();
assertThat(receivedMessages, is(notNullValue()));
final Exchange receivedExchange = receivedMessages.iterator().next();
assertThat(receivedExchange.getMessage().getContent(String.class), is(equalTo(PAYLOAD)));