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java - 尽管有`when()`方法它返回null

问题描述

我想测试控制器方法是否返回http status 200

@Slf4j
@Controller
public class AcknowledgeAlertsServiceImpl implements AcknowledgeAlertsService {

    ...

    @Override
    @RequestMapping(value = SERVICE_MAPPING, method = POST)
    public @ResponseBody
    ResponseEntity acknowledge(@PathVariable(ALERT_ID) String alertId) {

        ....

        try {
            Map.Entry<AlertID, AlertJTO> entry = cache.findUserEntryById(alertId, userLogin);
            ...
            return new ResponseEntity(HttpStatus.OK);
        } catch (Exception ex) {
            ...
            return new ResponseEntity(HttpStatus.BAD_REQUEST);
        }
    }
}

我已经模拟了缓存并添加了when()哪个集合findUserEntryById来返回给定的条目。不幸的是，它返回一个空值，不知道为什么，稍后会抛出空值并捕获“捕获”。问题是为什么它返回 null 尽管设置了它应该返回的行为。结果是 http 代码 400，而不是 200。我想正确传递所有内容，无论传递什么。

public Map.Entry<AlertID, AlertJTO> findUserEntryById(String alertId, String userLogin) {
        return cache.entrySet()
                .stream()
                .filter(key -> key.getKey()
                        .getUserLogin()
                        .equals(userLogin))
                .filter(entry -> entry.getValue()
                        .getId()
                        .equals(alertId))
                .findFirst()
                .orElse(null);
    }

测试：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "..." })
@WebAppConfiguration
 public class AcknowledgeAlertsServiceImplTest {

private static final String ALERT_ID = "123";

...

private MockMvc mockMvc;

...
   ...


 @Test
public void acknowledgeOfExistingAlert() throws Exception {
    //given
    UserData userData = mock(UserData.class);
    AlertID alertID = mock(AlertID.class);
    AlertJTO alertJTO = mock(AlertJTO.class);

    Map.Entry<AlertID, AlertJTO> entry = new AbstractMap.SimpleEntry<>(alertID, alertJTO);
    //when
    when(flightmapUserContext.getUserData()).thenReturn(userData);
    when(cache.findUserEntryById(any(),any())).thenReturn(entry);
    //then
    mockMvc.perform(MockMvcRequestBuilders.post(url(), ALERT_ID)
            .param(AcknowledgeAlertsService.ALERT_ID, ALERT_ID))
            .andExpect(MockMvcResultMatchers.status()
                    .isOk());
}

标签： javajunitmockitomockmvc

解决方案

看看 Spring 的@MockBean注解。删除@InjectMocks并离开：

@RunWith(SpringRunner.class)
@WebMvcTest(SomeController.class)
public class SomeControllerIT {

  @MockBean
  private AlertsCache alertsCache;

  @Autowired
  private MockMvc mockMvc;

  @Before
  public void setUp() {
    when(alertsCache.findUserById(anyLong())).thenReturn(someEntry);
  }
}

并做正常的 when/thenReturn 事情。

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