Switch语句中的PowerMockito枚举引发NPE

Question

我正在使用PowerMockRunner测试一个类，它从一个助手类的静态方法中检索一个value枚举。将此value枚举传递到classUnderTest中的SWITCH语句中时，将抛出空指针。

我已经调试过了，可以看到ENUM设置正确(名称、类型、序号都是预期的)，所以我不确定为什么会抛出NPE。有谁遇到过类似的问题吗？

注意:由于classUnderTest包含对私有方法的调用，因此PowerMockito是必需的。下面是删除了大量代码(与问题无关)的完整示例。在设置ENUM并抛出NPE时添加的注释

ClassUnderTest：

public class TestService extends BaseXAServiceBean
{

@Override
public ValueObject runExecute(ValueObject param) throws RemoteException, ServiceException
{
    try
    {
        ValueEnum value = ValueServiceHelper.getValueType(param1(),
                    param2());
        // value populated successfully with ENUM at this point         


        // NPE thrown when value is passed into below switch
        switch (value)
        {
            case VALUE1:
            {                       
                // logic here...
                break;
            }

            case VALUE2:
            {                       
                // logic here...
                break;
            }

            case VALUE3:
            {                       
                // logic here...
                break;
            }
        }
    }
    catch (ServiceException e)
    {
        throw e;
    }
    catch (Exception e)
    {
        throw new ServiceException(e, AppErrorCodes.INT.SL06, AppErrorCodes.SL06.E04);
    } finally {
        // clean up
    }
}
}

具有静态方法的Helper类：

public class ValueServiceHelper
{
public static ValueEnum getValueType(String param1, String param2) throws ServiceException
    {
        ValueEnum retVal = ValueEnum.VALUE3;

        // proxy is mocked
        ProductProxy proxy = ProxyFactory.createFactory("1").getProductProxy();

        try
        {
            if (proxy.isValue1(param2))
            {
                retVal = ValueEnum.VALUE1;
            }
            else if (proxy.isValue2(param2))
            {
                retVal = ValueEnum.VALUE2;
            }

        }
        return retVal;
    }
}

测试类：

@RunWith(PowerMockRunner.class)
@PrepareForTest({ProxyFactory.class})
public class ValueTest {

@Spy
@InjectMocks
private TestService service = new TestService();

@Mock
private ProxyFactory proxyFactory;

@Mock
private Proxy proxy;

@Before
public void setUp() throws Exception {
    MockitoAnnotations.initMocks(this);

    PowerMockito.mockStatic(ProxyFactory.class);
}

@Test
public void testSuccess() throws Exception {
    // given

    // when
PowerMockito.when(ProxyFactory.createFactory("1")).thenReturn(proxyFactory);
PowerMockito.when(proxyFactory.getProductProxy()).thenReturn(proxy);
    PowerMockito.when(proxy.isValue1(param2)).thenReturn(true);
    PowerMockito.when(proxy.isValue2(param2)).thenReturn(true);
    service.runExecute(request);        

    // then

}
}

Answer 1

这是已经存在的since at least 2015的PowerMock的问题。据我所知，修复它的唯一方法是使用if语句而不是switch。