### Question:
ChatSender { public void sendSystemMessage(String message) { Jedis jedis = JedisFactory.getJedis(); jedis.rpush(ChatType.ChatSystem.name(), message); } ChatSender(); static final ChatSender getInstance(); void stopWorkers(); void sendSystemMessage(String message);  }### Answer:
@Test public void testSendSystemMessage() { ChatSender sender = new ChatSender(); sender.sendSystemMessage("这是一条测试中的系统消息"); assertTrue(true); }