spring - 如何使用 Mockito 模拟 Hibernate Query.list()

Question

这是我需要测试的类(class):

@Repository
@Transactional
public class ProductDAOImpl implements ProductDAO {

private static final Logger logger = Logger.getLogger(ProductDAOImpl.class);

@Autowired
private SessionFactory hibernateSessionFactory;


@Override
public ProductDTO getProduct(String isbn) throws ProductException {
    ProductDTO productDTO = new ProductDTO();
    Product product = getProductFromDb(isbn);
    BeanUtils.copyProperties(product, productDTO);
    return productDTO;
}

private Product getProductFromDb(String isbn) throws ProductException{
    Session session = this.hibernateSessionFactory.getCurrentSession();


    String hql = "FROM com.esp.dao.entity.Product P WHERE P.isbn13 = :isbn13";
    Query query = session.createQuery(hql);
    query.setParameter("isbn13",isbn);


    List<Product> productList = query.list();  // Want to mock this call
    if(productList.size() ==1)      
        return productList.get(0);
    else if(productList.size() >1)
        // throw new ProductException("Cannot return product. Multiple products found.", HttpServletResponse.SC_NOT_FOUND);
        throw new ProductException("Cannot return product. Multiple products found.");
    else if(productList.size() == 0){
        throw new ProductException("Cannot return product. No products found.");
    }
    return null;

}

我想模拟 query.list() 方法。这是我到目前为止所尝试过的，但出现异常:类型“SessionFactory”是一个接口(interface)，无法监视它。

@RunWith(MockitoJUnitRunner.class)
public class TestProductDaoImpl {

@Spy
private SessionFactory hibernateSessionFactory;
@InjectMocks
private ProductDAOImpl productDAOImpl;

@Test
public void testGetProduct() throws ProductException {

    Session session = this.hibernateSessionFactory.getCurrentSession();

    String hql = "";
    Query query = session.createQuery(hql);
    Query spy = Mockito.spy(query);
    List<Product> productList = getProductList();
    doReturn(productList).when(spy).list();

    productDAOImpl.getProduct("abc");


}

我可以模拟 getProductFromDb()。但在这种情况下，不需要为此编写测试用例，因为类的大部分部分都被模拟了。

Answer 1

我认为有两种方法:

第一: 像这样在 SessionFactory 上创建模拟

@Mock
private SessionFactory hibernateSessionFactory;

@Before
public void beforeTest(){
    MockitoAnnotations.initMocks(this);
}

@Test
public void testGetProduct() throws ProductException {
     //then mock all you need from hibernateSessionFactory
     Session session = Mockito.mock(Session.class);
     Query query = Mockito.mock(Query.class);

     Mockito.when(hibernateSessionFactory.getCurrentSession()).thenReturn(session);
     Mockito.when(session.createQuery("FROM com.esp.dao.entity.Product P WHERE P.isbn13 = :isbn13")).thenReturn(query);

     List<Product> productList = new ArrayList<>(1);
     Mockito.when(query.list()).thenReturn(productList);

第二:您应该创建 SessionFactory 的实例

private SessionFactory hibernateSessionFactory;

@Before
public void beforeTest(){
    hibernateSessionFactory = Mockito.spy(new ConstructorForSessionFactory ());
}