try {
List<Message> messages = Lists.newArrayList(
new Message().setUniqueKey(key),
new Message().setUniqueKey(key2));
SendMessageResponse result = producer.sendMessages(messages);
Assert.assertEquals(1, result.getMessages().size());
Assert.assertEquals(1, result.getNotUnique().size());
} catch (MessageQueueException e) {
Assert.fail(e.getMessage());
}