mybatisPlus,使用JMockit 进行mock Iservice 的getOne 方法

例如：

1. 我有一个 Userservice  继承mybatisPlus的通用service， 默认就会实现了 getOne方法
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, UserEntity> implements UserService {

}

2. 我在controller 中调用

    @GetMapping("/demo/user")
    public String demostr() {
        QueryWrapper<UserEntity> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("u_id", "123");
        UserEntity one = userService.getOne(queryWrapper);
        return one.getUName();
    }

3. 进行 junit mock
    @Test
    public void testService(@Mocked UserService userService) {
//        new Expectations() {
//            {
//                UserService u2 = new UserServiceImpl();
//                u2.getOne(new QueryWrapper<UserEntity>());
////                userService.getOne(new QueryWrapper<UserEntity>());
//                UserEntity u = new UserEntity();
//                u.setUId("123");
//                u.setUName("456");
//                result = u;
////                returns(u,u,u,u);
////                userService.aaa();
////                result = "nnn";
//            }
//        };
        new MockUp<ServiceImpl<UserMapper, UserEntity>>() {
            @Mock
            public UserEntity getOne(Wrapper<UserEntity> userEntityWrapper) {
                UserEntity u = new UserEntity();
                u.setUId("123");
                u.setUName("456");
                return u;
            }
        };
        Assertions.assertThat(userController.demostr())
                .isEqualTo("456");
    }

无论是使用 expectations  还是MockUP 都不行