### Question:
TaskCallbackService { public int pause(int ntries){ return SLEEP_TIME_MILLIS * RETRY_BACKOFF[ntries % RETRY_BACKOFF.length]; } TaskCallbackService(); void addRemoteChannel(int taskInstanceId, NettyRemoteChannel channel); int pause(int ntries); void remove(int taskInstanceId); void sendAck(int taskInstanceId, Command command); void sendResult(int taskInstanceId, Command command);  }### Answer:
@Test public void testPause(){ Assert.assertEquals(5000, taskCallbackService.pause(3));; }