使用 Mockito 对 DAO 层进行单元测试

Question

尝试测试我的 DAO 方法：

@Repository
@ComponentScan(basePackages = {"com.sebhaw.cms.entity"})
public class AuthoritiesDAO extends CommonClass implements IDAO<Authorities>{

    public final Logger logger = LoggerFactory.getLogger(AuthoritiesDAO.class);
    
    public EntityManager entityManager;
    
    
    @Autowired
    public AuthoritiesDAO(EntityManager entityManager) {
        this.entityManager = entityManager;
    }

    private CommonClass commonClass;
    
    static final DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("HH:mm:ss");
    
    @Override
    public List<Authorities> getObjects() {
        
        Session currentSession = entityManager.unwrap(Session.class);
        Query<Authorities> theQuery = currentSession.createQuery("from Authorities",Authorities.class);
        List<Authorities> authorities = theQuery.getResultList();
        logger.warn("Query getAuthorities() on table Authorities in day: "+dateTimeFormatter.format(LocalDateTime.now())+" by: "+getPrincipal().toString());
        return authorities;
    }
    
    @Override
    public void saveObjects(Authorities t) {
        
        Session currentSession = entityManager.unwrap(Session.class);
        t.setLastModifier(getPrincipal());
        logger.warn("Record saved on table Authorities in day: "+dateTimeFormatter.format(LocalDateTime.now())+", data: "+t.toString()+" by: "+getPrincipal().toString());
        currentSession.saveOrUpdate(t);
    }
    
    @Override
    public Authorities getObjects(int theId) {
        Session currentSession = entityManager.unwrap(Session.class);
        Authorities theAuthorities = currentSession.get(Authorities.class, theId);
        logger.warn("Query getAuthorities(int theId) on table Authorities in day: "
        +dateTimeFormatter.format(LocalDateTime.now())+"with ID: "+theId+" by: "+getPrincipal().toString());
        return theAuthorities;
    }
    
    @Override
    public void deleteEntities(int theId) {
        
        Session currentSession = entityManager.unwrap(Session.class);
        Query theQuery = currentSession.createQuery("delete from Authorities where id=:authoritiesId");
        theQuery.setParameter("authoritiesId", theId);
        logger.warn("Record deleted in table Authorities on day: "+dateTimeFormatter.format(LocalDateTime.now())+", with ID: "+theId+" by: "+getPrincipal().toString());
        theQuery.executeUpdate();   
    }
}

这是我的单元测试（不工作）：

public class AuthoritiesDAOTest {
    
    @Mock
    private Session session;
    
    private EntityManager entityManager;
    
    private CommonClass commonClass;
    
    private AuthoritiesDAO authoritiesDAO;
    
    @BeforeEach
    void init() {
        entityManager = Mockito.mock(EntityManager.class);
        Mockito.when(entityManager.unwrap(Session.class)).thenReturn(session);
        authoritiesDAO = new AuthoritiesDAO(entityManager);
    }
    
    @Test
    void shouldReturnEmptyCollection() {
        Query query = Mockito.mock(Query.class);
        Mockito.when(session.createQuery(ArgumentMatchers.anyString(),ArgumentMatchers.any())).thenReturn(query);
        Mockito.when(query.getResultList()).thenReturn(new ArrayList<Authorities>());
        
        List<Authorities> result = authoritiesDAO.getObjects();
        assertTrue(true);
    }

}

由于我处于死胡同，我要求提供对我的 dao 层进行有效单元测试的示例。 “Neque porro quisquam est qui dolorem ipsum quia dolor sit amet、consectetur、adipisci velit……” “Neque porro quisquam est qui dolorem ipsum quia dolor sit amet、consectetur、adipisci velit……” “Neque porro quisquam est qui dolorem ipsum quia dolor sit amet、consectetur、adipisci velit……” "Neque porro quisquam est qui dolorem ipsum quia dolor sit amet、consectetur、adipisci velit..."

Answer 1

你可以自己google一下，会得到多个链接。部分链接

https://dzone.com/articles/unit-testing-dao-service-and-controller-in-spring
https://howtodoinjava.com/best-practices/how-you-should-unit-test-dao-layer/