@Test
 public void deliverShouldNotPropagateException() throws Exception {
   MailboxListener.Event event =
       new MailboxListener.Event(new MockMailboxSession("test"), null) {};
   doThrow(new RuntimeException()).when(mailboxListener).event(event);
   asynchronousEventDelivery.deliver(mailboxListener, event);
   verify(mailboxListener, timeout(ONE_MINUTE)).event(event);
 }
 @Test
 public void deliverShouldWorkWhenThePoolIsFull() throws Exception {
   MailboxListener.Event event =
       new MailboxListener.Event(new MockMailboxSession("test"), null) {};
   int operationCount = 10;
   for (int i = 0; i < operationCount; i++) {
     asynchronousEventDelivery.deliver(mailboxListener, event);
   }
   verify(mailboxListener, timeout(ONE_MINUTE).times(operationCount)).event(event);
 }
 @Test
 public void deliverShouldWork() throws Exception {
   MailboxListener.Event event = new MailboxListener.Event(null, null) {};
   asynchronousEventDelivery.deliver(mailboxListener, event);
   verify(mailboxListener, timeout(ONE_MINUTE)).event(event);
 }