code: @VisibleForTesting
  	String getOrCreateQueue() {
          List<String> queueUrls = listQueues(queueName);
  		if (queueUrls == null || queueUrls.isEmpty()) {
              CreateQueueRequest createQueueRequest = new CreateQueueRequest().withQueueName(queueName);
              CreateQueueResult result = client.createQueue(createQueueRequest);
              return result.getQueueUrl();
  		} else {
              return queueUrls.get(0);
          }
      }
docs: Private methods