Spring Boot REST：无法测试@RequestParam的验证

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德克斯特：

我想使用以下类结构测试Spring Boot API的控制器：

控制器：

@RestController
@RequestMapping("/member-management")
@Validated
public class MemberManagementController {

    private final MemberManagementService memberManagementService;

    public MemberManagementController(MemberManagementService memberManagementService) {
        this.memberManagementService = memberManagementService;
    }

    @GetMapping(value = "/view-member")
    public ResponseEntity<?> viewMember(
            @NotBlank(message = "username must not be blank!!") 
            @Size(max = 20, message = "maximum size of username id is 20!!") 
            @RequestParam("username") String username) {
        ...
    }
...

控制器建议：

@ControllerAdvice
public class CustomRestExceptionHandler extends ResponseEntityExceptionHandler {
    @ExceptionHandler(ConstraintViolationException.class)
    public ResponseEntity<Object> handleConstaintViolatoinException(final ConstraintViolationException ex) {
        List<String> details = new ArrayList<>();
        Set<ConstraintViolation<?>> violations = ex.getConstraintViolations();
        for (ConstraintViolation<?> violation : violations) {
            details.add(violation.getMessage());
        }
        ApiErrorResUtil error = new ApiErrorResUtil(String.valueOf(HttpStatus.BAD_REQUEST.value()),
                "Request param error", details);
        return new ResponseEntity<>(error, HttpStatus.BAD_REQUEST);
    }
...
}

单元测试：

@RunWith(MockitoJUnitRunner.class)
public class MemberManagementControllerTest {

    @InjectMocks
    private MemberManagementController memberManagementController;

    @Mock
    private MemberManagementService memberManagementService;

    private MockMvc mockMvc;

    @Before // Execute before each test method
    public void setup() {
        this.mockMvc = MockMvcBuilders.standaloneSetup(memberManagementController)
                .setControllerAdvice(new CustomRestExceptionHandler()) // add ControllerAdvice to controller test
                .build();
    }

    @Test 
    public void viewMember_usernameSizeExceedsMaximumLimit() throws Exception {
        // Value from client
        String username = "a12345678901234567890"; // 21 characters

        MemberResDtoDataDummy memberResDtoDataDummy = new MemberResDtoDataDummy();

        when(memberManagementService.viewMember(username)).thenReturn(memberResDtoDataDummy.getMember1());

        mockMvc.perform(get("/member-management/view-member").param("username", username))
                .andExpect(status().isBadRequest()).andReturn();
    }

问题：

java.lang.AssertionError: Status expected:<400> but was:<200>
    at org.springframework.test.util.AssertionErrors.fail(AssertionErrors.java:59)
    ...

任何人都可以帮助我解决这个问题，为什么预期的状态是200而不是400，使用无效输入参数的POST，PUT，PATCH，DELETE请求方法的其他测试仍然可以正常工作:(

CodeScale：

如果要在不启动服务器的情况下测试UI层的情况，则必须将此测试定义为spring-boot并自动连接MockMvc。

@SpringBootTest @AutoConfigureMockMvc

这个类注释将在没有服务器的情况下加载所有applicationContext。

如果您只想加载Web层，则只需将此注释放在测试类中即可。

@WebMvcTest

有了这个注释，Spring Boot仅实例化了Web层，而不是整个上下文。

在这两种情况下，您都必须自动连接MockMvc类型。

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