Is it possible to have write NonBlocking Junit tests

I am writing a Junit tests for Amqp Message Listener.This is how the test is written.I send a message to a exchange and introduce a delay of 1s (assuming that the listener will do its job within that time frame).This approach slows down the build process as there 15-20 tests like these which take a minimum of 20 seconds to execute.Is there a way in which I can do this is a non blocking way.For pass a call handler which verifies the tests after the listener does it job.Something like Actors might be internally used