java - 仅当套件运行时测试才会出现 HttpMediaTypeNotAcceptableException

Question

我是 Spring 开发新手，正在尝试学习。安装了 Netbeans 11.1 并克隆了此 git repository并试图让这个 VideoController 通过。

我很惊讶为什么 testAddGetVideo() 测试在组中运行时失败，但在单独运行时却通过。 The test suite is here 。纠结了好几天了。通读 SO 和其他帖子。

testAddGetVideo 在测试套件中失败，但个别测试通过(向下滚动查看下文)

在堆栈跟踪中有一个

org.springframework.web.HttpMediaTypeNotAcceptableException

testAddGetVideo():

@Test
public void testAddGetVideo() throws Exception {
    videoSvc.addVideo(video);
    Collection<Video> stored = videoSvc.getVideoList();
    assertTrue(stored.contains(video));
}

它调用的我的 VideoController 方法:

/**
 * getVideos
 *
 * @return Collection<Video>
 */
@RequestMapping(value = VIDEO_SVC_PATH, method = RequestMethod.GET)
public @ResponseBody Collection<Video> getVideos(HttpServletResponse response) {
    System.out.println("---------------getVideos---------------");
    System.out.println(videos.size() + " videos");
    System.out.println("===================");
    response.setContentType("application/json");
    response.setStatus(200);
    return videos.values();
}

/**
 * newVideo
 *
 * @param v
 * @return Video
 */
@RequestMapping(value = VIDEO_SVC_PATH, method = RequestMethod.POST)
public @ResponseBody Video newVideo(@RequestBody Video v) {
    System.out.println("---------------newVideo---------------");

    checkAndSetId(v);
    String url = getDataUrl(v.getId());
    v.setDataUrl(url);

    videos.put(v.getId(), v);
    System.out.println("video " + v.getId() + " at " + v.getDataUrl());
    System.out.println("===================");
    return v;
}

视频服务

public static final String VIDEO_SVC_PATH = "/video";

public static final String VIDEO_DATA_PATH = VIDEO_SVC_PATH + "/{id}/data";

/**
 * This endpoint in the API returns a list of the videos that have
 * been added to the server. The Video objects should be returned as
 * JSON. 
 * 
 * To manually test this endpoint, run your server and open this URL in a browser:
 * http://localhost:8080/video
 * 
 * @return
 */
@GET(VIDEO_SVC_PATH)
public Collection<Video> getVideoList();

/**
 * This endpoint allows clients to add Video objects by sending POST requests
 * that have an application/json body containing the Video object information. 
 * 
 * @return
 */
@POST(VIDEO_SVC_PATH)
public Video addVideo(@Body Video v);

日志:

---------------newVideo---------------
video 1 at http://localhost:8080/video/1/data
===================
---------------uploadVideo---------------
1 for video 1 data data
===================
---------------downloadVideo---------------
1 for video 1
===================
---------------newVideo---------------
video 2 at http://localhost:8080/video/2/data
===================

FAILS HERE TRANSMITTING THE VIDEOS

---------------getVideos---------------
2 videos
===================
---------------uploadVideo---------------

-9223372036854775808 for non existent video 

发送无效 ID -9223372036854775808 是测试的一部分。

getVideos() 失败。 (日志输出的顺序有偏差)

2019-09-09 14:50:28.988  WARN 16804 --- [tp1776486598-21] org.eclipse.jetty.server.Response        : Committed before 406 null
2019-09-09 14:50:28.988  WARN 16804 --- [tp1776486598-21] .w.s.m.s.DefaultHandlerExceptionResolver : Handling of [org.springframework.web.HttpMediaTypeNotAcceptableException] resulted in Exception

java.lang.IllegalStateException: Committed
    at org.eclipse.jetty.server.Response.resetBuffer(Response.java:1242)
    at org.eclipse.jetty.server.Response.sendError(Response.java:567)
    at org.eclipse.jetty.server.Response.sendError(Response.java:544)
    at org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver.handleHttpMediaTypeNotAcceptable(DefaultHandlerExceptionResolver.java:246)
    at org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver.doResolveException(DefaultHandlerExceptionResolver.java:119)
    at org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:138)
    at org.springframework.web.servlet.handler.HandlerExceptionResolverComposite.resolveException(HandlerExceptionResolverComposite.java:75)

...堆栈跟踪继续...

但是当我立即运行单独的测试而不重新启动服务器时，它就通过了。

---------------newVideo---------------
video 3 at http://localhost:8080/video/3/data
===================
---------------getVideos---------------
3 videos
===================

单独测试通过

Answer 1

不知道为什么，但下面的更改修复了它。问题可能出在自动化测试上。

@Test
public void testGetNonExistantVideosData() throws Exception {

    long nonExistantId = getInvalidVideoId();

    try{
        Response r = videoSvc.getData(nonExistantId);
        assertEquals(404, r.getStatus());
    }catch(RetrofitError e){
        assertEquals(404, e.getResponse().getStatus());
    }
}

我的方法签名如下。 我将方法更改为当传入无效的 id 作为参数时返回 null，并且仅当传入有效的 id 并且二进制视频 mpeg 数据成功写入 HttpServletResponse.Outputstream 时才返回 VideoStatus .

换句话说，执行 response.sendError() 还需要 return null;。

   @RequestMapping(value = VIDEO_DATA_PATH, method = RequestMethod.POST)
    public @ResponseBody VideoStatus uploadVideo(@PathVariable("id") long id, @RequestParam("data") MultipartFile data, HttpServletResponse response) {
        VideoStatus status = new VideoStatus(VideoStatus.VideoState.READY);