mockito单元测试demo

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@RunWith(SpringJUnit4ClassRunner.class) // 整合
@ContextConfiguration(locations = {"classpath:spring/application*.xml"}) // 加载配置
@TransactionConfiguration(transactionManager = "transactionManager")
@Transactional
public class UserServiceTest {

    /**（被注入的对象）
     * 该注解的对象也被mock了，（一般情况下）除了@mock的对象能注入，
     * 在UserServiceImpl类内部的其他@Autowired属性都为null
     */
    @InjectMocks
    UserServiceImpl userService = mock(UserServiceImpl.class);

    /**
     * 注入到UserServiceImpl中，也就是注入到@InjectMocks标注的对象
     */
    @Mock
    private UserApiService userApiService;

    /**
     *因为该属性不需要被mock，但单元测试需要调用到该对象的方法，因此需要执行
     * ReflectionTestUtils.setField(
     * AopTargetUtils.getTarget(userService),"wechatApiService",wechatApiService);
     * 来为userService对象设置属性
     * （@Reference和@Autowired同类型）
     */
    @Reference
    private WechatApiService wechatApiService;

    String userId = "asdfasdfasdfasdf";

    @Before
    public void setUp() throws Exception {
        MockitoAnnotations.initMocks(this);
        //构造数据
        UserResultDto userResultDto = new UserResultDto();
        userResultDto.setUsername("hello");
        userResultDto.setNickName("world");
        userResultDto.setPhone("18825153385");
        ReflectionTestUtils.setField(AopTargetUtils.getTarget(userService),"wechatApiService",wechatApiService);
        Mockito.when(userApiService.getUserById(userId)).thenReturn(userResultDto);
        //需要告诉被@InjectMocks修饰的对象去调用真实的方法，否则单元测试方法中的被@InjectMocks修饰的对象不会调用真正的getUserInfoByUserId方法
        doCallRealMethod().when(userService).getUserInfoByUserId(userId);
    }

    @Test
    public void testetUserInfoByUserId() {
        UserInfoVo userInfoVo = userService.getUserInfoByUserId(userId);
        Assert.assertEquals(null, userInfoVo);
    }

}

AopTargetUtils类的代码：

public class AopTargetUtils {
    /**
     * 获取 目标对象
     *
     * @param proxy 代理对象
     * @return
     * @throws Exception
     */
    public static Object getTarget(Object proxy) throws Exception {
        if (!AopUtils.isAopProxy(proxy)) {
            return proxy;//不是代理对象  
        }
        if (AopUtils.isJdkDynamicProxy(proxy)) {
            return getJdkDynamicProxyTargetObject(proxy);
        } else { //cglib  
            return getCglibProxyTargetObject(proxy);
        }
    }

    private static Object getCglibProxyTargetObject(Object proxy) throws Exception {
        Field h = proxy.getClass().getDeclaredField("CGLIB$CALLBACK_0");
        h.setAccessible(true);
        Object dynamicAdvisedInterceptor = h.get(proxy);
        Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField("advised");
        advised.setAccessible(true);
        return ((AdvisedSupport) advised.get(dynamicAdvisedInterceptor)).getTargetSource().getTarget();
    }


    private static Object getJdkDynamicProxyTargetObject(Object proxy) throws Exception {
        Field h = proxy.getClass().getSuperclass().getDeclaredField("h");
        h.setAccessible(true);
        AopProxy aopProxy = (AopProxy) h.get(proxy);
        Field advised = aopProxy.getClass().getDeclaredField("advised");
        advised.setAccessible(true);
        return ((AdvisedSupport) advised.get(aopProxy)).getTargetSource().getTarget();
    }
}

最后感谢这两篇文章：
http://xiahaihuje.iteye.com/blog/2174150
http://www.cnblogs.com/syxchina/p/4150879.html