为什么当我使用@JsonView时@InjectMocks控制器的响应会被 Mockito 变成空？

Question

我正在获得一个空的JSON {}（通过actions.andReturn().getResponse().getContentAsString()验证）作为响应，当我通过mockMvc.perform(post...)) 测试，该方法实际上返回了响应（我在我调试并逐步浏览代码。这是一个有效的，填充的响应对象，但是当Mockito中的某些代码制作模式时，突然变为null-为什么这样做？）。

测试类：

@RunWith(MockitoJUnitRunner.class)
public class Test
{
    //Also tried @Mock
    @InjectMocks
    private MyService myService;
    @Mock
    private MyDAO myDAO;
    //@Autowired
    @InjectMocks
    private MyController myController;
    @Before
    public void setup() {
        //Build the controller mock handler
        mockMvc = MockMvcBuilders
            .standaloneSetup(myController)
            .setControllerAdvice(new ExceptionHandler())
            .build();
    }
    @org.junit.Test
    public void testMyEndpoint() throws Exception
    {
        //Make a request object
        MyRequest request = readJson("request.json", MyRequest.class );
        List<MyObject> objects = readJson("data.json", MyObject.class );
        Mockito.when(
            myDAO.getData( request )
        ).thenReturn(objects);
        Mockito.when(
            myService.callDAO(request)
        )
            .thenReturn(objects)
        //Call the aum endpoint
        ResultActions actions = mockMvc.perform(
            post( "/v1/endpoint" )
                .contentType(MediaType.APPLICATION_JSON)
                .content( new ObjectMapper().writeValueAsString( request ) )
        );
        //Why is this empty?
        System.out.println( actions.andReturn().getResponse().getContentAsString() );
    }
}

Answer 1

Mockito使用不了解 @JsonView的对象模具。要解决这个问题，您需要设置一个可以做的消息转换器。

@RunWith(MockitoJUnitRunner.class)
public class Test
{
    //Also tried @Mock
    @InjectMocks
    private MyService myService;
    @Mock
    private MyDAO myDAO;
    //@Autowired
    @InjectMocks
    private MyController myController;
    /**
     * This is required for JsonViews.
     * @return
     */
    public static MappingJackson2HttpMessageConverter createJacksonConverter() {
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(MapperFeature.DEFAULT_VIEW_INCLUSION, true);
        MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
        converter.setObjectMapper(objectMapper);
        return converter;
    }
    @Before
    public void setup() {
        //Build the controller mock handler
        mockMvc = MockMvcBuilders
            .standaloneSetup(myController)
            .setControllerAdvice(new ExceptionHandler())
            .setMessageConverters(createJacksonConverter())
            .build();
    }
    @org.junit.Test
    public void testMyEndpoint() throws Exception
    {
        //Make a request object
        MyRequest request = readJson("request.json", MyRequest.class );
        List<MyObject> objects = readJson("data.json", MyObject.class );
        Mockito.when(
            myDAO.getData( request )
        ).thenReturn(objects);
        Mockito.when(
            myService.callDAO(request)
        )
            .thenReturn(objects)
        //Call the aum endpoint
        ResultActions actions = mockMvc.perform(
            post( "/v1/endpoint" )
                .contentType(MediaType.APPLICATION_JSON)
                .content( new ObjectMapper().writeValueAsString( request ) )
        );
        //Why is this empty?
        System.out.println( actions.andReturn().getResponse().getContentAsString() );
    }
}