为什么测试成功时MockMvc请求检索空的响应正文?

2022-06-13 00:00:00 rest java spring-boot junit5 mockmvc

我正在尝试测试我的Spring Boot REST控制器,以检查如果Bean验证失败,请求是否发送属性错误。

我有一个@RestController:

@RestController
@RequestMapping("/restaurants")
public class RestaurantsApiController {

    private final RestaurantService restaurantService;
    private final ProductRepository productRepository;
    private final ProductMapper productMapper;

    public RestaurantsApiController(RestaurantService restaurantService, ProductRepository productRepository, ProductMapper productMapper) {
        this.restaurantService = restaurantService;
        this.productRepository = productRepository;
        this.productMapper = productMapper;
    }

    @PostMapping("{id}/products")
    public ResponseEntity<ProductDto> addProduct(@PathVariable Long id,
                                                 @Valid @RequestBody ProductDto productDto){
        Product product = this.restaurantService.addProduct(id, productMapper.productDtoToProduct(productDto));
        return new ResponseEntity<>(productMapper.productToProductDto(product), HttpStatus.CREATED);
    }

我有一个带有@ControllerAdance注释的自定义异常处理程序:

@ControllerAdvice
public class ExceptionControllerAdvice {
    @ExceptionHandler({MethodArgumentNotValidException.class})
    public ResponseEntity<Object> validationException(MethodArgumentNotValidException ex, WebRequest request) {
        ....
// here i format my custom error message
        return new ResponseEntity<>(apiError, new HttpHeaders(), apiError.getStatus());
    }

它运行良好,如果验证失败,则向我发送此自定义响应:

{
    "status": "BAD_REQUEST",
    "errors": {
        "price": "doit être supérieur ou égal à 0",
        "name": "ne doit pas être nul",
        "category": "ne doit pas être nul"
    }
}

我正在尝试使用mock Mvc测试此测试类的行为:

@ExtendWith(MockitoExtension.class)
class RestaurantsApiControllerTest {

    @Mock
    private RestaurantService restaurantService;
    @Mock
    private ProductRepository productRepository;
    @Mock
    private ProductMapper productMapper;
    @InjectMocks
    private RestaurantsApiController controller;

    MockMvc mockMvc;

    @BeforeEach
    void setUp() {
        mockMvc = MockMvcBuilders.standaloneSetup(controller).build();
    }

    @Test
    void givenInvalidFrom_whenAddProduct_ThenShouldThrowException() throws Exception {
        // productDto miss name, category and have negative value for price which is forbidden by validations annotations
        ProductDto productDto = ProductDto.builder().id(1L).price(-10.5D).build();

        MvcResult mvcResult = mockMvc.perform(post("/restaurants/1/products")
                .contentType(MediaType.APPLICATION_JSON)
                .content(asJsonString(productDto)))
                .andExpect(status().isBadRequest())
                .andReturn();

        String result = mvcResult.getResponse().getContentAsString();

        then(restaurantService).shouldHaveNoInteractions();
    }

测试完全通过,我可以在日志中看到验证异常预期正常:

14:53:30.345 [main] WARN org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver - Resolved [org.springframework.web.bind.MethodArgumentNotValidException: Validation failed for argument ...
//I removed the rest of the message for readability, but each validation exception appears here properly
14:53:30.348 [main] DEBUG org.springframework.test.web.servlet.TestDispatcherServlet - Completed 400 BAD_REQUEST

但是我找不到一种方法来测试我的错误映射是否包含我期望的字段。当我尝试使用:

检索响应正文时
String result = mvcResult.getResponse().getContentAsString();

字符串为空,我找不到任何测试响应正文的方法。

我完全没有想法,如果能帮上忙,我会非常感激的!

非常感谢!


解决方案

使用Builder配置MockMvc实例时,请进行以下更新:

MockMvcBuilders
    .standaloneSetup(controller)
    .setControllerAdvice(new ExceptionControllerAdvice())
    .build()

您应该手动设置控制器建议以模拟MVC上下文,否则它将被忽略。 在此更新之后,您将收到错误响应中的正文。如果您想验证Json Body,请使用上面答案中的json路径API。

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