在为 @post 方法编写 Junit 测试用例时，我在 userService.addUser() 方法中遇到空指针异常。有人可以帮忙吗

Question

public class UserService {
        
        @Autowired
        private UserRepository userRepository;
        
        @Autowired
        private ConverterService converterService;
        public User addUser(UserDto userdto) {
            User convertedUser = converterService.convertToEntity(userdto);
            convertedUser.setUserId(userdto.getUserId());
            convertedUser.setUserName(userdto.getUserName());
            User savedUser = userRepository.save(convertedUser); 
            return savedUser;
        }
    }

//调试userRepository.save(convertedUser)方法时，总是返回null。

下面是我的 UserServiceTest.java 类

@RunWith(SpringRunner.class)
    @SpringBootTest
    public class UserServiceTest {
    
        @Autowired
        private UserService userService;
    
        @Mock
        private ConverterService converterService;
    
        @MockBean
        private UserRepository userRepository;
    
        @Test
        public void addUserTest() {
            UserDto userDto = new UserDto();
            userDto.setUserId("123");
            userDto.setUserName("AB");
            User user = new User("123","ABC");
            Mockito.when(converterService.convertToEntity(new UserDto())).thenReturn(user);
            Mockito.when(userRepository.save(user)).thenReturn(user);
            User user1 = userService.addUser(userDto);
            Assert.assertEquals(user,userService.addUser(userDto));
    
        }
    }

userService.addUser(userDto) 这个方法总是从服务类返回 null。由于以下条件失败： Assert.assertEquals(user,userService.addUser(userDto));

Answer 1

您不应将 null 值传递给 assertEquals 方法。但是你可以这样做；

Assert.assertEquals(Objects.equals(user,userService.addUser(userDto)),true);