### Question:
QueueListeningMonitor { public void start() { scheduledExecutorService.scheduleAtFixedRate( () -> { try { scanQueueMissListening(); } catch (Throwable e) { log.warn("scan queue miss listening : ", e); } }, deFiBrokerController.getDeFiBusBrokerConfig().getCheckQueueListeningPeriod(), deFiBrokerController.getDeFiBusBrokerConfig().getCheckQueueListeningPeriod(), TimeUnit.MINUTES); } QueueListeningMonitor(DeFiBrokerController deFiBrokerController); void start(); void shutdown();  }### Answer:
@Test public void testQueueListeningMonitorStart() throws Exception { deFiBrokerController.start(); verify(queueListeningMonitor).start(); }