为什么在模拟服务时模拟 mvc 测试失败并出现异常？

Question

我不明白为什么这个测试会异常失败？服务 class 被嘲笑...

@Autowired
private MockMvc mockMvc;

@MockBean
private InventoryService inventoryService;


private List<InventoryDTO> inventoryList;

@BeforeEach
void setup() {
    ...
}

@Test
@DisplayName("POST /inventory test - status 200")
@WithMockUser(roles = {"PUBLISHER", "USER"})
void addItem() throws Exception {

    doReturn(inventoryList.get(0)).when(inventoryService).add(any());

    mockMvc.perform(
            MockMvcRequestBuilders.post("/inventory")
                    .content(asJsonString(inventoryList.get(0)))
                    .contentType(MediaType.APPLICATION_JSON)
                    .accept(MediaType.APPLICATION_JSON))
            .andDo(MockMvcResultHandlers.print())
            .andExpect(status().isOk())
            .andExpect(content().json("{'name':'test1','description':'test-1-description','price':10}"))
            .andReturn();
}

这是经过测试的控制器：

@RestController
public class InventoryController {

    private final InventoryService inventoryService;

    public InventoryController(InventoryService inventoryService) {
        this.inventoryService = inventoryService;
    }

    @GetMapping("/inventory")
    @ResponseBody public List<InventoryDTO> allInventory(){
        return inventoryService.findAll();
    }

    @PostMapping("/inventory")
    @ResponseBody public InventoryDTO addInventory(@RequestBody InventoryDTO inventoryDTO){
        return inventoryService.add(inventoryDTO);
    }

例外情况：

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class com.teamcompetencymatrix.www.dto.AuditDTO]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.teamcompetencymatrix.www.dto.AuditDTO` (no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: (PushbackInputStream); line: 1, column: 72] (through reference chain: com.teamcompetencymatrix.www.dto.InventoryDTO["audit"])

    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:652)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
    at org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:72)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
    at org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:167)

据我所知，mockito 应该模拟服务 class，并且测试不会进入其中... 据我所知，审计员对财务总监没有任何影响class。

Answer 1

错误说明了一切：

Cannot construct instance of com.teamcompetencymatrix.www.dto.AuditDTO (no Creators, like default constructor, exist)

请求主体无法转换为 DTO，请尝试向 AuditDTO

添加一个空的构造函数和 setter

为什么在模拟服务时模拟 mvc 测试失败并出现异常？

Why mocked mvc test fails with exception when service is mocked?

java

spring

unit-testing

controller

mockito