如何在Spring Boot Test中模拟BindingResult [英] How to mock BindingResult in Spring Boot Test

问题描述

我有以下控制器:

@RestController
@RequestMapping(value = ROOT_MAPPING)
public class GatewayController
{
    @Autowired
    private RequestValidator requestValidator;

    @InitBinder
    protected void initBinder(WebDataBinder binder)
    {
        binder.addValidators(requestValidator);
    }

    @PostMapping(value = REDIRECT_MAPPING)
    public ResponseEntity<ResponseDTO> redirectEndpoint(@Validated @RequestBody RequestDTO requestDTO, BindingResult result)
    {
        if (result.hasErrors())
        {
            // Handle validation errors
            return ResponseEntity.status(HttpStatus.BAD_REQUEST).build();
        }

        // Do other stuff
        return ResponseEntity.status(HttpStatus.OK).build();
    }
}

这个测试课:

@RunWith(SpringRunner.class)
@WebMvcTest(GatewayController.class)
public class GatewayControllerTest
{
    @Autowired
    private MockMvc mockMvc;

    @MockBean
    private RequestValidator requestValidator;

    @MockBean
    private BindingResult bindingResult;

    private JacksonTester<RequestDTO> requestJacksonTester;

    @Before
    public void setUp() throws Exception
    {
        JacksonTester.initFields(this, new ObjectMapper());
        Mockito.when(requestValidator.supports(ArgumentMatchers.any())).thenReturn(true);
    }

    @Test
    public void whenRedirectWithValidationErrorsThenBadRequestReturned() throws Exception
    {
        RequestDTO request = new RequestDTO();
        // Set some values

        Mockito.when(bindingResult.hasErrors()).thenReturn(true);

        mockMvc.perform(MockMvcRequestBuilders.post(ROOT_MAPPING + REDIRECT_MAPPING).contentType(MediaType.APPLICATION_JSON).content(requestJacksonTester.write(request).getJson())).andExpect(MockMvcResultMatchers.status().isBadRequest());
    }
}

当我运行这段代码时，测试用例由于以下原因而失败:状态 预期:400 实际:200

When I run this code the test case fail with this reason: Status Expected :400 Actual :200

因此，我想做的是模拟BindingResult，它作为参数传递给Controller中的redirectEndpoint方法，以便在调用bindingResult.hasErrors()时应返回true并通过测试用例.

So, what I want to do is to mock the BindingResult which passed as a parameter to the redirectEndpoint method in the Controller so that when calling bindingResult.hasErrors() this should return true and the test case pass.

我进行了很多搜索，但是没有运气.有什么建议可以做到吗?

I did many search but with no luck. Any suggestions how to do that?

谢谢.

推荐答案

BindingResult不是ApplicationContext中的 bean .因此，您不能通过@MockBean模拟 .

BindingResult is not a bean in the ApplicationContext. Thus, you cannot mock it via @MockBean.

Spring MVC为每个传入的HTTP请求为您创建一个BindingResult.

A BindingResult is created for you by Spring MVC for each incoming HTTP request.

因此，您不想模拟BindingResult.实际上，您可能也不想模拟RequestValidator的行为.相反，理想情况下，您应该使用RequestValidator的真实实现，通过MockMvc传入无效请求数据，然后相应地验证响应.

Thus, you don't want to mock the BindingResult. In fact, you probably don't want to mock the behavior of your RequestValidator either. Rather, you should ideally use the real implementation of your RequestValidator, pass in invalid request data (via MockMvc), and then verify the response accordingly.

请注意，您应该能够通过测试类上的@Import(RequestValidator.class) include RequestValidator的真正实现.

Note that you should be able to include the real implementation of your RequestValidator via @Import(RequestValidator.class) on the test class.

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