q = instance.getQueue(name);
String id = q.addItemListener(ql, false);
q.offer(2);
Thread.sleep(sleep);
q.removeItemListener(id);
q.offer(3);
Thread.sleep(sleep);
assertEquals(1, qLatch.getCount());
qLatch.countDown();
assertTrue("Remaining:" + qLatch.getCount(), qLatch.await(3, TimeUnit.SECONDS));
q.destroy();