### Question:
QueueConfig extends SerializableBase { @JsonIgnore public boolean isDeadLetterQueue(String name) { if (!hasDeadLetterQueue()) { return false; } for (DeadLetterQueue deadLetterQueue : deadLetterQueues) { if (deadLetterQueue.getName().equals(name)) { return true; } } return false; }  void updateTime(); boolean updateRetryCount(int newRetryCount); boolean addDeadLetterQueue(DeadLetterQueue deadLetterQueue); boolean updateVisibilityTimeout(long newTimeOut); boolean updateConcurrency(MinMax<Integer> concurrency); boolean updatePriorityGroup(String priorityGroup); boolean updatePriority(Map<String, Integer> newPriority); @JsonIgnore boolean isDeadLetterQueue(String name); @JsonIgnore boolean hasDeadLetterQueue();  }### Answer:
@Test public void isDeadLetterQueue() { QueueConfig queueConfig = TestUtils.createQueueConfig("test", "test-dlq"); assertTrue(queueConfig.isDeadLetterQueue("test-dlq")); assertFalse(queueConfig.isDeadLetterQueue("test")); }