### Question:
MessageTemplate extends AbstractYammerOperations implements MessageOperations { public MessageInfo getMessagesAboutTopic(long topicId, long olderThan, long newerThan, String threaded, int limit){ MultiValueMap<String, String> params = buildParams(olderThan, newerThan, threaded, limit); return restTemplate.getForObject(buildUri("messages/about_topic/"+topicId+".json", params), MessageInfo.class); } MessageTemplate(RestTemplate restTemplate); MessageInfo getMessages(long olderThan, long newerThan, String threaded, int limit); MessageInfo getMessagesFollowing(long olderThan, long newerThan, String threaded, int limit); MessageInfo getMessagesSent(long olderThan, long newerThan, String threaded, int limit); MessageInfo getMessagesPrivate(long olderThan, long newerThan, String threaded, int limit); MessageInfo getMessagesAboutTopic(long topicId, long olderThan, long newerThan, String threaded, int limit); MessageInfo getMessagesInGroup(long groupId, long olderThan, long newerThan, String threaded, int limit); MessageInfo getMessagesInThread(long threadId, long olderThan, long newerThan, int limit); MessageInfo getMessagesFromUser(long userId, long olderThan, long newerThan, String threaded, int limit); MessageInfo getMessagesLikedByUser(long userId, long olderThan, long newerThan, String threaded, int limit); MessageInfo getMessagesReceived(long olderThan, long newerThan, String threaded, int limit); MessageInfo postUpdate(String message); MessageInfo postUpdate(String message, YammerPostDetails details); void like(long messageId); void unlike(long messageId); void delete(long messageId);  }### Answer:
@Test public void testGetMessagesAboutTopic() { mockServer.expect(requestTo("https: .andRespond(withSuccess(jsonResource("testdata/yammer-messages"), APPLICATION_JSON)); MessageInfo messageInfo = yammerTemplate.messageOperations().getMessagesAboutTopic(123,0,0,null,0); assertMessageInfo(messageInfo); }
@Test public void testGetMessagesAboutTopic_withParams() { mockServer.expect(requestTo("https: .andRespond(withSuccess(jsonResource("testdata/yammer-messages"), APPLICATION_JSON)); MessageInfo messageInfo = yammerTemplate.messageOperations().getMessagesAboutTopic(123,10000, 1, "true", 10); assertMessageInfo(messageInfo); }