Question

我正在使用JUnit，Mockito和Spring的MockMvc编写一个单元测试，测试从服务中读取GridFSDBFile的能力，然后写入响应的内容。它无法从模拟的GridFSDBFile中读取模拟的InputStream，但它可以读取模拟的长度？！我哪里错了？

控制器：

...
@Controller
public class FileReadController {

    @Autowired
    private IFileService fileService;

    @RequestMapping(value = "/v0/files/{fileid}", method = RequestMethod.GET)
    public @ResponseBody void read(@PathVariable String fileid, HttpServletResponse res) throws IOException {
        GridFSDBFile file = this.fileService.find(fileid);
        res.setContentLength((int) file.getLength());
        IOUtils.copy(file.getInputStream, res.getOutputStream());

        System.out.println("file's length:" + file.getLength());
        System.out.println("file's content:" + IOUtils.toString(file.getInputStream()));
    }
}
...

ControllerTest：

...
public class FileReadControllerTest {

    private MockMvc mockMvc;

    @Mock
    private FileService mockFileService;
    @InjectMocks
    private FileReadController mockReadController;

    @Before
    public void setUp() throws Exception {
        MockitoAnnotations.initMocks(this);
        this.mockMvc = MockMvcBuilders.standaloneSetup(mockReadController).build();
    }

    @Test
    public void shouldReadSuccessfully() throws Exception {

        GridFSDBFile file = createFile();
        String expectedString = IOUtils.toString(file.getInputStream());

        when(mockFileService.find(anyString())).thenReturn(file);

        this.mockMvc.perform(get("/v0/files/fileId"))
                    .andExpect(status().isOk())
                    .andExpect(content().string(expectedString));

    }

    private GridFSDBFile createFile() throws IOException {

        String content = "this is the fake content";

        GridFSDBFile file = mock(GridFSDBFile.class);
        when(file.getInputStream()).thenReturn(IOUtils.toInputStream(content));
        when(file.getLength()).thenReturn((long) content.length());
        when(file.getContentType()).thenReturn("application/x-rpm");

        return file;
    }

}
...

它失败了：

java.lang.AssertionError: Response content expected:<this is the fake content> but was:<>

控制台输出：

...
file's length:24
file's content:          //nothing
...

当我在调试模式下调查file.getInputStream（）时，它会在那里显示一些内容：

file.getInputStream();
    - buf   [116, 104, 105, 115, 32, ...]
    - count 24
    - mark  0
    - pos   24

所以我无法弄清楚为什么我无法将此inputStream转换为String，即使其中有内容......

某些依赖

org.springframework.boot:spring-boot-starter-web:0.5.0.M4
org.apache.commons:commons-io:1.3.2
junit:junit:4.11
org.mockito:mockito-all:1.9.5
org.springframework:spring-test:3.2.4.RELEASE

Answer 1

您的问题可能是由于mockReadController的初始化不正确引起的。当mockReadController预期为null时，您可以在setUp（）方法的开头调用MockitoAnnotations.initMocks（this）。所以不可能将mockFileService注入其中。

尝试这样的事情：

@Before
public void setUp() throws Exception {
    mockReadController = Mockito.mock(FileReadController.class);    
    MockitoAnnotations.initMocks(this);
    //your other stuff
}

无法从模拟的GridFSDBFile中读取模拟的InputStream

1 个答案: