Mockito+Powermock 单元测试简单使用说明

说明

提供几个简单的例子，说明如何利用Mockito + Powermock来做单元测试

一、POM 依赖

<mockito.version>1.10.19</mockito.version>
<powermock.version>1.7.0</powermock.version>

<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-api-mockito</artifactId>
    <version>${powermock.version}</version>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-module-junit4</artifactId>
    <version>${powermock.version}</version>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>org.powermock</groupId>
    <artifactId>powermock-module-junit4-rule-agent</artifactId>
    <version>${powermock.version}</version>
    <scope>test</scope>
</dependency>

这里mockito 使用1.x版本，powermock使用1.7.0.

二、Mockito+Powermock 实例

普通service方法

public class StoreServiceImpl implements StoreService {

private OrderDetailMapper detailMapper;

private OfflineOrderReasonService offlineOrderReasonService;

public int insertOrderDetail(OrderDetail orderDetail) {
        int id = 0;
        try {
            id = detailMapper.insert(orderDetail);
        } catch (Exception e) {
            OfflineOrderReasonDO reasonDO = this.convertTo(orderDetail,2,"插入订单信息异常");
            offlineOrderReasonService.saveOfflineOrderReason(reasonDO);
            LoggerUtil.error(logger, "[INSERT_ORDER_FAIL] msg=orderNo:"+orderDetail.getOrderNo(),"errorMsg:"+e.getMessage(),e);
        }
        return id;
    }

}

单元测试

第一步 告诉junit使用PowerMockRunner执行单元测试

@RunWith(PowerMockRunner.class)
public class StoreServiceImplTest{

第二步 利用注解mock对象

@InjectMocks：添加了该注解的对象的方法是可以进入，被执行的
@Mock：添加了该注解的对象所有的属性和方法都是不可使用的

  @InjectMocks
    StoreServiceImpl storeService;
   @Mock
    private OrderDetailMapper detailMapper;

第三步 初始化mock对象

   @Before
    public void setUp() {
        // 对定义了注解对象进行初始化
        MockitoAnnotations.initMocks(this);
        prepareData();
    }

第四步 编写test方法

    @Test
    public void insertOrderDetailTest() {
        PowerMockito.when(detailMapper.insert(orderDetail)).thenReturn(1);

        int id = storeService.insertOrderDetail(orderDetail);

        // 验证是否进入了detailMapper.insert
        Mockito.verify(detailMapper).insert(orderDetail);
        // 验证返回是否正确
        Assert.assertEquals(1,id);
    }

   @Test
    public void insertOrderDetailWithExceptionTest() {
        // 执行方法时抛异常
        PowerMockito.when(detailMapper.insert(Mockito.any())).thenThrow(new NullPointerException());
        // void的方法
        PowerMockito.doNothing().when(offlineOrderReasonService).saveOfflineOrderReason(Mockito.any());

        int id = storeService.insertOrderDetail(orderDetail);

        Assert.assertEquals(0,id);
    }