### Question:
DeadLetterConfig extends AbstractConfig { @Override public boolean validate() { log.info("Validating DeadLetterConfig..."); if (deadLetterExchange != null && deadLetterExchange.validate()) { log.info("DeadLetterConfig configuration validated successfully for deadLetterExchange '{}'", deadLetterExchange); return true; } log.error("Invalid DeadLetterConfig Configuration : Valid DeadLetterExchange must be provided for DeadLetterConfig"); return false; }  String createDeadLetterQueueName(String queueName); @Override boolean validate();  }### Answer:
@Test public void invalidDeadLetterConfigWithoutExchange() { deadLetterConfig = DeadLetterConfig.builder() .deadLetterExchange(null) .queuePostfix(".dlq") .build(); assertFalse(deadLetterConfig.validate()); }
@Test public void invalidDeadLetterConfigWithoutExchangeName() { deadLetterConfig = DeadLetterConfig.builder() .deadLetterExchange(ExchangeConfig.builder().build()) .queuePostfix(".dlq") .build(); assertFalse(deadLetterConfig.validate()); }