使用@ControllerAdvice测试@RestController

时间:2014-07-15 18:09:57

标签: java spring junit

我的问题与测试Spring @RestController有关,它也使用@ControllerAdvice和@ExceptionHandler。这是代码:

@ControllerAdvice class:

@ControllerAdvice
public class MyAppExceptionHandler {

    @ExceptionHandler({ NoSuchEntityException.class })
    @ResponseStatus(value = HttpStatus.NOT_FOUND)
    public @ResponseBody
    ErrorDTO handleNotFoundException(Exception ex) throws IOException {

        return new ErrorDTO.Builder().setStatus(HttpStatus.NOT_FOUND)
                .setCause(ex.getClass().getName())
                .setThrowable(ex).build();
    }
}

在应用程序中使用它时一切正常 - 使用JSON解释完美地获得404响应,但在测试期间尝试使用它时 - 会发生不好的事情。

我的测试班:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = { WebConfig.class })
@WebAppConfiguration
public class SomeTest {

    @Mock
    private SomeService service;

    @InjectMocks
    private SomeController controller;

    private MockMvc mvc;

    private ExceptionHandlerExceptionResolver createExceptionResolver() {
        ExceptionHandlerExceptionResolver exceptionResolver = new ExceptionHandlerExceptionResolver() {
            @Override
            protected ServletInvocableHandlerMethod getExceptionHandlerMethod(
                HandlerMethod handlerMethod, Exception exception) {
                Method method = new ExceptionHandlerMethodResolver(
                        MyAppExceptionHandler.class).resolveMethod(exception);
                return new ServletInvocableHandlerMethod(
                    new MyAppExceptionHandler(), method);
            }
        };
        exceptionResolver.afterPropertiesSet();
        return exceptionResolver;
    }

    @Before
    public void setup() {

        MockitoAnnotations.initMocks(this);
        mvc = MockMvcBuilders.standaloneSetup(controller)
                .setHandlerExceptionResolvers(createExceptionResolver())
                .build();
    }

    @Test
    public void thatExceptionHappens() throws Exception {

        when(service.get(10)).thenThrow(new NoSuchEntityException(Some.class, 10));

        mvc.perform(get("/api/some/10")).andExpect(status().isNotFound());
    }
}

尝试运行时:

2014-07-15 19:35:01.376 [main] ERROR com.package.SomeTest$1 - Failed to invoke @ExceptionHandler method: public com.package.ErrorDTO com.package.MyAppExceptionHandler.handleNotFoundException(java.lang.Exception) throws java.io.IOException
org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation

我认为可能在测试我的@ExceptionHandler时没有加载MappingJackson2HttpMessageConverter(但是它在WebConfig.class中配置,并且在尝试执行典型测试时 - 没有抛出任何异常 - 一切正常)。

提前感谢您的帮助。

2 个答案:

答案 0 :(得分:14)

我不确定这是否是最好的解决方案(我想听听另一个), 但这就是我如何解决你面临的问题:

将此行添加到createExceptionResolver()

exceptionResolver.getMessageConverters().add(
        new MappingJackson2HttpMessageConverter());

这样的事情:

private ExceptionHandlerExceptionResolver createExceptionResolver() {
    ExceptionHandlerExceptionResolver exceptionResolver = new ExceptionHandlerExceptionResolver() {
        @Override
        protected ServletInvocableHandlerMethod getExceptionHandlerMethod(
            HandlerMethod handlerMethod, Exception exception) {
            Method method = new ExceptionHandlerMethodResolver(
                    MyAppExceptionHandler.class).resolveMethod(exception);
            return new ServletInvocableHandlerMethod(
                new MyAppExceptionHandler(), method);
        }
    };
    exceptionResolver.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
    exceptionResolver.afterPropertiesSet();
    return exceptionResolver;
}

由于某些我不知道的原因,Spring没有加载我的 MappingJackson2HttpMessageConverter
那条线解决了我的问题。

答案 1 :(得分:3)

根据定义,MockMvcBuilders standaloneSetup是手动的,这意味着它不是像Spring配置中的@ControllerAdvice那样发现感兴趣的Spring bean,而是让您手动设置测试所需的内容。相反,standaloneSetup应该让你手动注册@ControllerAdvice bean。有一张发生这种情况的票。请参阅https://jira.spring.io/browse/SPR-12751