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I have a process that runs in a thread (used as a realtime signal analysis process). I want to feed that thread process a known input, and then test -- in jUnit -- that the output is correct. I have a callback listener that can notify me when the thread finishes processing the data and I can run assertions on the result successfully by registering the test case itself as a listener. When those assertions fail, they do throw an exception. But that exception is not registered as a failure by jUnit, presumably because they are happening outside of a test method. How do I structure my jUnit test so that the test fails correctly after the listener returns? Here's a simplified version of the code. public class PitchDetectionTest extends TestCase implements EngineRunCompleteListener() { AudioData fixtureData; PitchDetectionEngine pitchEngine; public void setUp() { fixtureData = <stuff to load audio data>; } public void testCorrectPitch() { pitchEngine = new PitchEngine(fixtureData); pitchEngine.setCompletionListener(this); pitchEngine.start(); // delay termination long enough for the engine to complete try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } // gets called by the PitchEngine when it has finished processing all data in the // fixtureData. This is the only method defined by interface // EngineRunCompleteListener. public void notifyEngineRunComplete() { // The real code asserts things about the PitchEngine's results. When they fail, // an exception is thrown that I can see in the console, but this unit test still // shows as 'success' in the jUnit interface. What I want is to see // testCorrectPitch() fail. assertTrue(false); } } public class PitchEngine () { EngineRunCompleteListener completionListener(); Thread myThread; public void start() { // other stuff

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