使用 jsonPath 进行 Junit 测试未找到匹配的内容

Question

我有这个简单的单元测试：-

@Test
void getCityName() throws Exception {
    when(weatherService.getWeatherByCity(capitalize(TestData.getWeather().getCity())))
            .thenReturn(TestData.getWeatherList());

 mockMvc.perform(get(WeatherController.WEATHER+WeatherController.GET_WEATHER_BY_CITY+"/espoo"))
            .andExpect(status().isOk())
            .andExpect(content().contentType(MediaType.APPLICATION_JSON_VALUE))
    /*  it doesn't work if uncommented.  
            .andExpect(jsonPath("$.city")
                    .value("espoo"))
   */
            .andDo(MockMvcResultHandlers.print());

}

.andDo(MockMvcResultHandlers.print()); 打印出这个：-

    MockHttpServletResponse:
        Status = 200
    Error message = null
        Headers = [Content-Type:"application/json"]
    Content type = application/json
            Body = [{"id":null,"city":"espoo","country":null,"description":null,"currentTemp":0.0,"feelsLike":3.3,"minTemp":2.2,"maxTemp":5.5,"tempLimit":3.0,"frequency":5,"frequencyUnit":"SECOND","uri":"https://api.openweathermap.org/data/2.5/weather?q=espoo&units=metric&APPID=5536a9b0c84d081997982254c24fc53a"}]
    Forwarded URL = null
Redirected URL = null
        Cookies = []

我可以看到有"city":"espoo"。我如何匹配这个。我累了：-

 .andExpect(jsonPath("$.city")
 .value("espoo"))

它给出错误：-

调试 org.springframework.test.web.servlet.TestDispatcherServlet - 完成 200 OK 调试 com.jayway.jsonpath.internal.path.CompiledPath - 评估路径：$.size() 调试 com.jayway.jsonpath.internal.path.CompiledPath - 评估路径：$['city']

java.lang.AssertionError：JSON 路径“$.city”处没有值

Answer 1

响应是数组类型：

[{"id":null,"city":"espoo","country":null,"description":null,"currentTemp":0.0,"feelsLike":3.3,"minTemp":2.2,"maxTemp":5.5,"tempLimit":3.0,"frequency":5,"frequencyUnit":"SECOND","uri":"https://api.openweathermap.org/data/2.5/weather?q=espoo&units=metric&APPID=5536a9b0c84d081997982254c24fc53a"}]

因此你需要先选择索引，然后属性$[0].city

 .andExpect(jsonPath("$[0].city", is(espoo)))

=== 已编辑 ===

请尝试：

  .andExpect(jsonPath("$[0].city").value("espoo"));