Question

对我的RestController的简单测试失败了。

设置 - 具有以下依赖项的SpringBoot 2.0.0.BUILD-SNAPSHOT：

dependencies {
    compile('org.springframework.boot:spring-boot-starter-data-jpa')
    compile('org.springframework.boot:spring-boot-starter-web')
    runtime('org.springframework.boot:spring-boot-devtools')
    runtime('com.h2database:h2')
    compileOnly('org.projectlombok:lombok')
    testCompile('org.springframework.boot:spring-boot-starter-test')
}

城市对象：

@Getter
@Setter
@NoArgsConstructor
public class City {
    private Long id;
    private String city;

    public City(Long id, String city) {
        this.id = id;
        this.city = city;
    }
}

控制器类：

@RestController
@RequestMapping("/cities")
public class CityController {
    @GetMapping
    public List<City> findAllCities() {
        return Collections.singletonList(new City(1L, "Rancho Cordova"));
    }
}

CityControllerTest类：

@RunWith(SpringRunner.class)
@SpringBootTest(classes = CityController.class, webEnvironment = SpringBootTest.WebEnvironment.MOCK)
@AutoConfigureMockMvc
public class CityControllerTest {
    @Autowired
    MockMvc mockMvc;

    @Test
    public void testGetAllCities() throws Exception {
        mockMvc.perform(get("/cities")
                .contentType(MediaType.APPLICATION_JSON))
                .andExpect(status().isOk());
    }
}

我运行Test时得到的异常：

.w.s.m.s.DefaultHandlerExceptionResolver : Failed to write HTTP message: org.springframework.http.converter.HttpMessageNotWritableException: No converter found for return value of type: class java.util.Collections$SingletonList

我错过了什么????????

Answer 1

我的坏。我上面提到的错误是我为Controller提供了参数。相反，代码应该是这样的：

@SpringBootTest(classes = CityApplication.class, webEnvironment = SpringBootTest.WebEnvironment.MOCK)

无法写入HTTP消息：org.springframework.http.converter.HttpMessageNotWritableException

1 个答案: