public void testListeners() { Cascade cascade = new BaseCascade(); CascadeListener listener = new CascadeListener() { @Override public void onStarting(Cascade cascade) {} @Override public void onStopping(Cascade cascade) {} @Override public void onCompleted(Cascade cascade) {} @Override public boolean onThrowable(Cascade cascade, Throwable throwable) { return false; } }; cascade.addListener(listener); assertTrue("no listener found", cascade.hasListeners()); cascade.removeListener(listener); assertFalse("listener found", cascade.hasListeners()); }