为什么在模拟服务时，模拟的MVC测试会失败并引发异常？

huangapple
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英文:

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

问题

以下是翻译好的内容：

我不明白为什么这个测试会因为异常而失败？
服务类已被模拟...

  1. @Autowired
  2. private MockMvc mockMvc;
  4. @MockBean
  5. private InventoryService inventoryService;
  7. private List<InventoryDTO> inventoryList;
  9. @BeforeEach
  10. void setup() {
  11.     ...
  12. }
  14. @Test
  15. @DisplayName("POST /inventory 测试 - 状态 200")
  16. @WithMockUser(roles = {"PUBLISHER", "USER"})
  17. void addItem() throws Exception {
  18.     doReturn(inventoryList.get(0)).when(inventoryService).add(any());
  20.     mockMvc.perform(
  21.             MockMvcRequestBuilders.post("/inventory")
  22.                     .content(asJsonString(inventoryList.get(0)))
  23.                     .contentType(MediaType.APPLICATION_JSON)
  24.                     .accept(MediaType.APPLICATION_JSON))
  25.             .andDo(MockMvcResultHandlers.print())
  26.             .andExpect(status().isOk())
  27.             .andExpect(content().json("{'name':'test1','description':'test-1-description','price':10}"))
  28.             .andReturn();
  29. }

以下是被测试的控制器：

  1. @RestController
  2. public class InventoryController {
  4.     private final InventoryService inventoryService;
  6.     public InventoryController(InventoryService inventoryService) {
  7.         this.inventoryService = inventoryService;
  8.     }
  10.     @GetMapping("/inventory")
  11.     @ResponseBody 
  12.     public List<InventoryDTO> allInventory(){
  13.         return inventoryService.findAll();
  14.     }
  16.     @PostMapping("/inventory")
  17.     @ResponseBody 
  18.     public InventoryDTO addInventory(@RequestBody InventoryDTO inventoryDTO){
  19.         return inventoryService.add(inventoryDTO);
  20.     }
  21. }

以下是异常信息：

  1. org.springframework.web.util.NestedServletException: 请求处理失败；嵌套异常为 org.springframework.http.converter.HttpMessageConversionException: 类型定义错误：[simple type, class com.teamcompetencymatrix.www.dto.AuditDTO]；嵌套异常为 com.fasterxml.jackson.databind.exc.InvalidDefinitionException: 无法构造 `com.teamcompetencymatrix.www.dto.AuditDTO` 的实例（没有构造器，例如默认构造器）：无法从对象值进行反序列化（没有委托或基于属性的构造器）；位置：[源：(PushbackInputStream)；行：1，列：72]（通过引用链：com.teamcompetencymatrix.www.dto.InventoryDTO["audit"]）
  2. 	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
  3.     ...

据我理解，Mockito 应该模拟服务类，而测试不会进入其中...
据我所知，审计员与控制器类无关。

英文:

I don't understand why this test fails with an exception?
The service class is mocked...

  1. @Autowired
  2. private MockMvc mockMvc;
  4. @MockBean
  5. private InventoryService inventoryService;
  8. private List&lt;InventoryDTO&gt; inventoryList;
  10. @BeforeEach
  11. void setup() {
  12.     ...
  13. }
  15. @Test
  16. @DisplayName(&quot;POST /inventory test - status 200&quot;)
  17. @WithMockUser(roles = {&quot;PUBLISHER&quot;, &quot;USER&quot;})
  18. void addItem() throws Exception {
  20.     doReturn(inventoryList.get(0)).when(inventoryService).add(any());
  22.     mockMvc.perform(
  23.             MockMvcRequestBuilders.post(&quot;/inventory&quot;)
  24.                     .content(asJsonString(inventoryList.get(0)))
  25.                     .contentType(MediaType.APPLICATION_JSON)
  26.                     .accept(MediaType.APPLICATION_JSON))
  27.             .andDo(MockMvcResultHandlers.print())
  28.             .andExpect(status().isOk())
  29.             .andExpect(content().json(&quot;{&#39;name&#39;:&#39;test1&#39;,&#39;description&#39;:&#39;test-1-description&#39;,&#39;price&#39;:10}&quot;))
  30.             .andReturn();
  31. }

And here is the tested controller:

  1. @RestController
  2. public class InventoryController {
  4.     private final InventoryService inventoryService;
  6.     public InventoryController(InventoryService inventoryService) {
  7.         this.inventoryService = inventoryService;
  8.     }
  10.     @GetMapping(&quot;/inventory&quot;)
  11.     @ResponseBody public List&lt;InventoryDTO&gt; allInventory(){
  12.         return inventoryService.findAll();
  13.     }
  15.     @PostMapping(&quot;/inventory&quot;)
  16.     @ResponseBody public InventoryDTO addInventory(@RequestBody InventoryDTO inventoryDTO){
  17.         return inventoryService.add(inventoryDTO);
  18.     }

And the exception:

  1. 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)
  2.  at [Source: (PushbackInputStream); line: 1, column: 72] (through reference chain: com.teamcompetencymatrix.www.dto.InventoryDTO[&quot;audit&quot;])
  4. 	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
  5. 	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
  6. 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:652)
  7. 	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
  8. 	at org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:72)
  9. 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
  10. 	at org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:167)

As I understand mockito should mock the Service class, and the test doesn't go inside of it...
The Auditor has nothing to the Controller class as far as I know.

答案1

得分: 1

错误信息已经表明了一切：

> 无法构造com.teamcompetencymatrix.www.dto.AuditDTO的实例（没有像默认构造函数这样的创建者存在）

请求正文无法转换为DTO，请尝试为AuditDTO添加一个空构造函数和setter。

英文:

The error says it all:

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

The request body can't be transformed into the DTO, Try adding an empty constructor and setters to the AuditDTO

huangapple
  • 本文由 发表于 2020年10月25日 06:02:04
  • 转载请务必保留本文链接：https://go.coder-hub.com/64518429.html
  • controller
  • java
  • mockito
  • spring
  • unit-testing
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