代码：https://github.com/mijosan/test-practice/tree/master/mybatis

@RequiredArgsConstructor
@RestController
public class UserController {

  private final UserService userService;

  @PostMapping(value="/v1/user")
  public ResponseEntity<ResponseDto> postUser(@RequestBody UserSaveRequestDto userSaveRequestDto) {
      Long userId = userService.insertUser(userSaveRequestDto);

      return CommonUtil.getResponseEntity(UserResponseDto.builder()
                                                              .userId(userId)
                                                              .build()
                                                              , HttpStatus.OK
                                                              , "회원 등록 완료");
  }

}

这是我的测试代码

@WebMvcTest
public class UserControllerTest {

  @Autowired
  MockMvc mockMvc;

  @Autowired
  ObjectMapper objectMapper;

  @MockBean
  UserService userService;

  UserSaveRequestDto userSaveRequestDto;

  @BeforeEach
  void setUp() {
      userSaveRequestDto = UserSaveRequestDto.builder()
          .userName("test")
          .userPhoneNumber("01026137832")
          .build();
  } 

  @DisplayName("MockMvc를 이용한 postUser slice 테스트")
  @Test
  public void postUserTest() throws Exception {
      // given
      given(userService.insertUser(userSaveRequestDto)).willReturn(1L);
      String content = objectMapper.writeValueAsString(userSaveRequestDto);

      // when
      MvcResult mvcResult = mockMvc.perform(post("/v1/user")
                      .contentType(MediaType.APPLICATION_JSON)
                      .content(content))
                          .andExpect(status().isOk())
                          .andReturn();

      // then
      String result = mvcResult.getResponse().getContentAsString();

      System.out.println(result);
  }

}

我收到一个异常“java.lang.assertionerror:status expected:<200>but was:<500>”
但是，如果您 swagger 地测试它，它会很好地工作。
原因在哪里？