@RequestMapping(value = VIDEO_LIKEDBY_PATH, method = RequestMethod.GET)
 public @ResponseBody Set<String> likedbyVideo(@PathVariable(VIDEO_ID) long id) {
   Video v = videos.findOne(id);
   if (v == null) {
     throw new ResourceNotFoundException();
   }
   return v.getLikedUsers();
 }
 private void setLike(long id, String user, HttpServletResponse res, boolean isLike) {
   Video v = videos.findOne(id);
   int code = HttpServletResponse.SC_OK;
   if (v == null) {
     code = HttpServletResponse.SC_NOT_FOUND;
   } else {
     if (isLike ? v.addLikedUser(user) : v.removeLikedUser(user)) {
       videos.save(v);
     } else {
       code = HttpServletResponse.SC_BAD_REQUEST;
     }
   }
   res.setStatus(code);
 }
  @Test
  public void testLikeCount() throws Exception {
    Video v;
    // Add the video
    v = readWriteVideoSvcUser1.addVideo(video);
    long id = v.getId();
    // Like the video
    readWriteVideoSvcUser1.likeVideo(id);

    // Get the video again
    v = readWriteVideoSvcUser1.getVideoById(id);
    // Make sure the like count is 1
    assertTrue(v.getLikes() == 1);

    // Unlike the video
    readWriteVideoSvcUser1.unlikeVideo(v.getId());

    // Get the video again
    v = readWriteVideoSvcUser1.getVideoById(v.getId());

    // Make sure the like count is 0
    assertTrue(v.getLikes() == 0);
  }