Junit 何时/何时返回未映射

我不明白为什么我的when/thenReturn没有映射到模拟bean

在调试期间，我可以看到userDto行userDto userDto=userService.updateid，entity之后的userDto；在被测控制器中，值等于null

知道我做错了什么吗

测试文件UsersControllerTest.java:

    package com.mycomp.mymessagesys.controllers;

import static org.mockito.Mockito.when;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.put;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.WebMvcTest;
import org.springframework.boot.test.mock.mockito.MockBean;
import org.springframework.http.MediaType;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.mycomp.mymessagesys.controller.UsersController;
import com.mycomp.mymessagesys.model.UserDTO;
import com.mycomp.mymessagesys.service.UserService;

@RunWith(SpringRunner.class)
@WebMvcTest(UsersController.class)
public class UsersControllerTest {

    @Autowired
    private MockMvc mockMvc;

    @Autowired
    private ObjectMapper jacksonMapper;

    @MockBean
    private UserService userService;

    @MockBean
    private UserDTO userDto;


    private UserDTO createUser(String id, int age, String name) {
        UserDTO userEntity = new UserDTO();
        userEntity.setId(id);
        userEntity.setAge(age);
        userEntity.setName(name);
        return userEntity;
    }

    @Test
    public void testUpdate() throws Exception {
        UserDTO userEntity = createUser("666", 66, "User_6");
        when(userService.update("666", userEntity)).thenReturn(userEntity);
        this.mockMvc.perform(put(UsersController.URL + "/666").contentType(MediaType.APPLICATION_JSON)
                .content(jacksonMapper.writeValueAsString(userEntity)))
        .andExpect(content().contentType(MediaType.APPLICATION_JSON_UTF8_VALUE))
        .andExpect(status().isOk());
    }


}

已测试的UsersController类：

package com.mycomp.mymessagesys.controller;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestController;

import com.mycomp.mymessagesys.model.UserDTO;
import com.mycomp.mymessagesys.service.UserService;

@RestController
@RequestMapping("/api/users")
public class UsersController implements RestControllerInterface<UserDTO> {

    public static final String URL = "/api/users";

    @Autowired
    private UserService userService;

    ....     

    @Override
    @PutMapping("/{id}")
    @ResponseStatus(HttpStatus.OK)
    public UserDTO update(@PathVariable("id") String id, @RequestBody UserDTO entity) {
        UserDTO userDto = userService.update(id, entity);
        return userDto;
    }

    ....
}

---

它不是映射，因为当条件不等于将在UsersController.update方法中创建的userEntity对象时，作为映射条件提供给mockito的userEntity对象。虽然它们在结构上是相同的，但它们是不同的实例

如果传递的实际userEntity对您来说无关紧要，那么您可以编写

when(userService.update(eq("666"), any(UserDTO.class))).thenReturn(userEntity);

让它工作

否则，若您想要匹配精确的用户标识，那个么首先通过覆盖UserDTO中的equals和hashcode方法来定义使一个UserDTO与另一个UserDTO相同的原因，然后您可以使用

when(userService.update(eq("666"), eq(userEntity))).thenReturn(userEntity);

---

感谢您的提醒，我重新检查了我的UserDTO.equals，发现了一个导致错误失败的错误。太好了，谢谢！

when(userService.update(eq("666"), eq(userEntity))).thenReturn(userEntity);