Question

我有一项我想测试的服务：

public class DepartmentServiceImpl implements DepartmentService {

    @Autowired
    private DepartmentDao departmentDao;
    //... other functions 

    @Override
    public Department getDepartment(int depid) {
        return departmentDao.getDepartment(depid);
    }
}

这是我的测试类：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:sdnext-servlet.xml")
public class TestDepartmentDetails {

    Department department  = new Department();
    DepartmentServiceImpl service = new DepartmentServiceImpl();

    @Autowired
    private DepartmentDao myDao;


    @Test
    public void testGetDepartment(){
        assertEquals("lalalalalalala", service.getDepartment(98).getDepName());
    }

为什么它会让我失败并抛出NullPointerException？还有其他解决方案吗？

注意：这是一个使用Spring和Hibernate的应用程序。

Answer 1

以这种方式试试

 @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration(locations = "classpath:sdnext-servlet.xml")
    public class TestDepartmentDetails {
        @Autowired
        DepartmentService   service;
        @Test
        public void testGetDepartment(){
            assertEquals("lalalalalalala", service.getDepartment(98).getDepName());
        }

Answer 2

这里您手动创建实例，这在使用Spring时不是正确的方法。

请参阅下面的Spring文档：

http://docs.spring.io/spring/docs/current/spring-framework-reference/htmlsingle/

在这种情况下，您必须自动装配 DepartmentServiceImpl 服务，而不是 DepartmentDao 。

使用JUnit比较2个对象

2 个答案: