java - 在独立 MockMvc 中测试 @Validated RestController 不起作用

Question

我用 @Validated 注释了 RestController，用于验证路径变量/请求参数:

@RestController
@Validated
public class MainController implements ApplicationListener<ApplicationReadyEvent> {

    @Autowired
    private CarsService carsService;

    @ExceptionHandler
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public void handleException(ConstraintViolationException ex) {}

    @GetMapping(
            value = "/",
            produces = MediaType.APPLICATION_JSON_VALUE)
    public ResponseEntity<?> getCars(
            @RequestParam(value = "offset", defaultValue = "0") @PositiveOrZero
                    Integer offset,
            @RequestParam(value = "limit", defaultValue = paginationLimitDefault)
            @Positive @Max(paginationLimitMax)
                    Integer limit) {
        ...
        ...
        Map responseBody = new HashMap<String, Object>();
        responseBody.put("offset", offset);
        responseBody.put("limit", limit);
        return ResponseEntity.status(HttpStatus.OK).body(responseBody);
    }
}

现在，我想使用独立的 mockMvc 对 Controller 级别进行单元测试:

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
@ActiveProfiles("test")
public class TestMainController {

    @InjectMocks
    private MainController mainController;

    @Mock
    private CarsService carsServiceMock;

    private MockMvc mockMvc;

    @Before
    public void initMocks() {
        MockitoAnnotations.initMocks(this);
        mockMvc = MockMvcBuilders.standaloneSetup(mainController).build();
    }

    @Test
    public void getCarsInvalidOffset() throws Exception {
        mockMvc.perform(get("/")
                .param("offset", "-1"))
                .andExpect(status().isBadRequest());
    }

    @Test
    public void getCarsInvalidLimit() throws Exception {
        mockMvc.perform(get("/")
                .param("limit", "0"))
                .andExpect(status().isBadRequest());
        mockMvc.perform(get("/")
                .param("limit", "-1"))
                .andExpect(status().isBadRequest());
        mockMvc.perform(get("/")
                .param("limit", "101"))
                .andExpect(status().isBadRequest());
    }
}   

问题是使用无效参数的测试(上面代码片段中的两个测试)应该返回错误的请求，实际上返回 200 OK，因此测试失败。
我该如何修复它？谢谢。

Answer 1

这对于standaloneSetup来说是不可能的。

更多详情请参阅:How to enable controller parameter validation for standalone MockMvc

对于@Validated 测试用例，我们需要:

MockMvcBuilders.webAppContextSetup()