我必须如何调整json路径以使我的测试成功

Question

@DisplayName("test getCarportById(), Status OK")
@Test
void testGetCarportLocationById() throws Exception {
// given
final String externalId = "123L";
final CarportLocation carportLocation = CarportLocationMockHelper.createCarportLocationByIdDTO(externalId);
given(carportService.getCarportLocationToId(externalId.toString())).willReturn(carportLocation);
// when
final MvcResult mvcResult = this.mockMvc.perform(getRequestBuilderMockCarportLocationsById(externalId.toString()))
.andExpect(status().isOk())
.andDo(print())
.andExpect(content().contentType("application/json"))
.andExpect(resultMatcherOK)
.andExpect(MockMvcResultMatchers.jsonPath("$.externalId")
      .value(CarportLocation.getExternalId()))
.andReturn();
// then
assertEquals("application/json", mvcResult.getResponse()
.getContentType());
}

public static CarportLocation createCarportLocationByIdDTO(String externalId) {
finalCarportLocation carportLocation = new CarportLocation();
carportLocation.setId(123456L);
carportLocation.setExternalId(externalId);
carportLocation.setCarportName("Carport1");
carportLocation.setLocX(12.4534);
carportLocation.setLocY(19.5678);
carportLocation.setLocZ(25.0);
return carportLocation;
}

这是我用.andDo(print(((打印出来的表达式：

MockHttpServletRequest:
HTTP Method = GET
Request URI = /carport/carports/filter
Parameters = {carportNameAndExternalId=[123L]}
Headers = []
Body = <no character encoding set>
Session Attrs = {}
Handler:
Type = controller.CarportController
Method = controller.CarportController#_getCarportLocationsByIdAndName(String)
Async:
Async started = false
Async result = null
Resolved Exception:
Type = null
ModelAndView:
View name = null
View = null
Model = null
FlashMap:
Attributes = null
MockHttpServletResponse:
Status = 200
Error message = null
Headers = [Content-Type:"application/json"]
Content type = application/json
Body = []
Forwarded URL = null
Redirected URL = null
Cookies = []

只是不幸的是，我的JUnit测试失败了，我不知道为什么。

java.lang.AssertionError：JSON路径"$"处没有值。externalId"；

当然，我也已经搜索过这个问题，并遇到了以下SO问题：断言错误：JUnit测试中的JSON路径没有值

只是不幸的是$[1] externalId"；因此，andDo(print())方法也有，但不能真正处理输出。有人知道我必须如何调整json路径才能成功测试吗？

Answer 1

根据以下内容：

MockHttpServletResponse:
Status = 200
Error message = null
Headers = [Content-Type:"application/json"]
Content type = application/json
Body = []
Forwarded URL = null
Redirected URL = null
Cookies = []

The response body is empty.没有返回JSON响应，那么您如何期待"$.externalId"；被发现？

此外，格式应为：

.andExpect(jsonPath("$.externalId", is(CarportLocation.getExternalId())))