"ConstraintValidator 在测试期间始终具有空值"

Question

after fixing a bug in an older Java Spring MVC 4.1 application, I wanted to add a unit test, but the method the current code base is using for testing won't actually execute validation.

// Unit Test
@RunWith(SpringJUnit4ClassRunner.class)
@WebAppConfiguration
@EnableWebMvc
@ContextConfiguration(locations = {"/applicationContext-test.xml"})
public class ExampleControllerTest extends AbstractControllerTestBase {
    @Autowired
    private WebApplicationContext context;

    private MockMvc mockMvc;


    @Before
    public void setup() {
        this.mockMvc = webAppContextSetup(this.context).build();
    }

    @Test
    public void fileUploadZipArchive() throws Exception {
        // Upload a zip file
        File mockFile = new File("src/test/resources/fixtures/ex.zip");

        MockHttpServletRequestBuilder multipart = MockMvcRequestBuilders
                .fileUpload("/files/ex/upload/Tex")
                .file("ex.zip",  FileUtils.readFileToByteArray(mockFile));

        MvcResult result = mockMvc.perform(multipart)
                .andReturn();
    }

Answer 1

The javadoc of the file method states that the name should be the name of the file. I agree that that is a bit misleading. Instead it should be the name of the request parameter to use, which should be (generally speaking) the same as the property in your model object.

.file("ex.zip",  FileUtils.readFileToByteArray(mockFile));

With this a request parameter named ex.zip will be part of the request, however you have one that is named file .

.file("file",  FileUtils.readFileToByteArray(mockFile));

Using the above line should fix it and properly bind to your object in turn properly invoking your validator.

On a side node, your validator should properly handle the null case as well or add a @NotNull on the field as well. The @Valid on the field doesn't do anything so you can remove that.