Question

我的类无法自动连接UserService - 它会抛出NullPointerException。我想找到一种方法来测试UserValidator类。我不知道如何在ExistingValidationRule类中注入模拟。

public class ExistingValidationRule implements RegistrationRule<User> {
@Autowired
private UserService service;

@Override
public void validate(User user, Errors errors) {

    service.find(user, errors);
}
}


@Component
public class UserValidator implements Validator {

    @Override
    public void validate(Object o, Errors errors) {
        User user = (User) o;
        rules.add(new ExistingValidationRule());

        for(RegistrationRule<User> rule : rules){
            rule.validate(user, errors);
        }
    }
}

public class UserValidatorTest {
@InjectMocks
private UserValidator userValidator;

@InjectMocks
private ExistingValidationRule existingValidationRule;

@Mock
private UserService service;

@Before
public void setup() {
    MockitoAnnotations.initMocks(this);
}
@Test
    public void testValidUser() throws Exception{

        userValidator.validate(createdUser,errors);
}

Answer 1

class UserValidator  
// if all roles that you need are spring beans- then do autowired then by super type
@Autowired 
privete Collection<RegistrationRule> roles ;

@Override
public void validate(Object o, Errors errors) {
    User user = (User) o;

    // all spring-bean configured validators were autowired 
    for(RegistrationRule<User> rule : rules){ 
        rule.validate(user, errors);
    }
}

或

@Component
public class UserValidator implements Validator {
    //if rules was created before
    @Autowired
    public void setExistingValidationRule(ExistingValidationRule existingValidationRule){
        rules.add(existingValidationRule);
    }

@Override
public void validate(Object o, Errors errors) {
    User user = (User) o;

    for(RegistrationRule<User> rule : rules){
        rule.validate(user, errors);
    }
}

并尽量避免在方法validate（）中添加新的责任 - 比如添加新的验证器。方法验证应该只进行验证，不再是

Answer 2

@Autowired是一个Spring注释，除非你用Spring测试运行器运行你的单元测试，否则这不会做任何事情。

然而，Mockito的@InjectMocks只会为你的田地填充Mocks，只要你提供一个构造函数来到达那些领域。请尝试以下方法：

public class ExistingValidationRule implements RegistrationRule<User> {
    @Autowired
    private UserService service;

    public ExistingValidationRule(UserService service) {
        this.service = service;
    }

    public ExistingValidationRule() {
    }

    @Override
    public void validate(User user, Errors errors) {

        service.find(user, errors);
    }
}

我添加了第二个空构造函数，让Spring感到高兴。第一个应该为您的单元测试提供技巧。

快乐测试！

在新对象中初始化模拟

2 个答案: