java - 使用 Mockito 模拟 Hibernate 的 SessionFactory 时测试失败

Question

好的，代码如下

使用 MockitoJUnitRunner 运行测试，并在 @Before 方法中执行

MockitoAnnotations.initMocks(this);

@Test
public void verifyTimestampTest(){
    TargetHistoryPK tHistoryPK = Mockito.mock(TargetHistoryPK.class);

    targetHistoryDAO = Mockito.mock(TargetHistoryDAOimpl.class);        
    session = Mockito.mock(Session.class);
    sessionFactory = Mockito.mock(SessionFactory.class);

    Mockito.when(sessionFactory.getCurrentSession()).thenReturn(session);

    TargetHistory th = Mockito.mock(TargetHistory.class);
    Mockito.when(session.save(th)).thenReturn(tHistoryPK);

    boolean h = targetHistoryDAO.addTargetHistory(th);

    System.out.println("erh: "+ th.getTarget_update() + h);
    assertNotNull("Timestamp is null", th.getTarget_update());
}

及测试方法

public class TargetHistoryDAOimpl implements TargetHistoryDAO {


    @Autowired
    private SessionFactory sessionFactory;

    public TargetHistoryDAOimpl() {     
    }

    public TargetHistoryDAOimpl(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }
    @Override
    public boolean addTargetHistory(TargetHistory th) {

        if(th.getTarget_update() == null){
            Date now = new Date();
            Timestamp timestamp = new Timestamp(now.getTime());
            th.setTarget_update(timestamp);
        }
        Session session = sessionFactory.getCurrentSession();
        TargetHistoryPK pk = (TargetHistoryPK)session.save(th);
        if(pk != null)
            return true;

        return false;
    }

}

通常 addTargetHistory() 是从下面介绍的服务类方法调用的

    @Transactional
    public boolean registerTargetActivity(TargetHistory th) {
        // TODO Auto-generated method stub
        return targetHistoryDao.addTargetHistory(th);
    }

有人可以向我解释为什么我的测试 verifyTimestampTest() 失败吗？

编辑我在测试中添加了一行(我无法调试 - 尝试调试时出现 sts 错误)

if(th == null)
        System.out.println("rggrgr");

像这样

@Test
public void verifyTimestampTest(){
    TargetHistoryPK tHistoryPK = Mockito.mock(TargetHistoryPK.class);
    targetHistoryDAO = Mockito.mock(TargetHistoryDAOimpl.class);        
    session = Mockito.mock(Session.class);
    sessionFactory = Mockito.mock(SessionFactory.class);

    Mockito.when(sessionFactory.getCurrentSession()).thenReturn(session);

    TargetHistory th = new TargetHistory();
    Mockito.when(session.save(th)).thenReturn(tHistoryPK);

    boolean h = targetHistoryDAO.addTargetHistory(th);

    if(th == null)
        System.out.println("targetHistory is null!");

    System.out.println("erh: "+ th.getTarget_update() + h);
    assertNotNull("Timestamp is null", th.getTarget_update());


}

我收到 sts 警告“死代码”。为什么？？？？为什么是死代码？

Answer 1

这是因为您的 TargetHistory th 是一个模拟。您没有为该模拟的方法设置任何行为。这就是为什么他们什么也不做并返回 null。上 this Mockito documentation page它说:

By default, for all methods that return value, mock returns null, an empty collection or appropriate primitive/primitive wrapper value (e.g: 0, false, ... for int/Integer, boolean/Boolean, ...).

Beware that void methods on mocks do nothing by default!

您需要将 TargetHistory 模拟替换为真实对象或 stub 。