Question

我有一个带有方法的简单控制器：

@ResponseBody
@RequestMapping(value = "/{" + WebConstants.ATTACHMENT_ID + "}", method = RequestMethod.GET)
@Produces(MediaType.APPLICATION_OCTET_STREAM)
public void getAttachmentById(@PathVariable(value = WebConstants.ATTACHMENT_ID) Integer attachmentId,
                                  HttpServletResponse response) throws IOException {

    logger.info("Start Document Attachment Controller: Fetch attachment by id." );

    // fetch the document attachment
    DocumentAttachment attachment = documentAttachmentService.getDocumentAttachmentById(attachmentId);
    final File file = new File(attachment.getPath() + Constants.FILE_SEPERATOR + attachment.getFileName());


    // convert the file to byte array and write it to the output stream
    byte[] contentAsBytes = IOUtils.toByteArray(new FileInputStream(file));

    String encoding = Constants.UTF8_FORMAT;
    response.setCharacterEncoding(encoding);
    /** set header */
    response.setHeader("Content-Disposition", "attachment; filename=\"" + file.getName() + "\"");

    /** write the file */
    response.getOutputStream().write(contentAsBytes);
    /** return to view */
    response.flushBuffer();
}

我正在尝试使用Junit测试转换它。我的单元测试代码发布在下面：

@InjectMocks
DocumentAttachmentController documentAttachmentController;

@Mock
HttpServletResponse response;

@Autowired
DocumentAttachmentService documentAttachmentService;

@Before
public void setUp() throws Exception {
    log.debug("initMocks()");
    MockitoAnnotations.initMocks(this);
}

@Test
public void testGetAttachmentById() throws IOException {
    log.debug("Test getAttachmentById");

    Document doc = new Document();
    doc.setDocumentId(1);

    DocumentAttachment attachment = new DocumentAttachment();
    attachment.setFileName("fileName");
    attachment.setId(1);
    attachment.setOriginalFileName("originFileName");
    attachment.setPath("/");
    attachment.setDocument(doc);

    when(documentAttachmentService.getDocumentAttachmentById(anyInt())).thenReturn(attachment);

    documentAttachmentController.getAttachmentById(1, response);

问题是它抛出了java.lang.NullPointerException。我调试了我的代码，似乎是条件 documentAttachmentService.getDocumentAttachmentById（附件ID）从应用程序中不占用所有when语句并返回null。我无法理解这是错的。有任何想法吗？感谢名单

案例被忽略时的Junit测试

0 个答案: