无法使用Powermock模拟静态方法(使用EasyMock)

Question

我想模拟静态方法以及类的非静态方法.我的来源看起来像:

    public class XDSUtilityManager
    {

        private static XDSUtilityManager xdsUtilMgr = new XDSUtilityManager();
        private XDSUtilityManager()
        {
            xdsUtilMgrImpl = new XDSUtilityManagerImpl();
        }

        public static XDSUtilityManager getInstance()
        {
            return (xdsUtilMgr == null ) ? new XDSUtilityManager() : xdsUtilMgr;
        }
        public XMLDocument getXMLDocument(final String absoluteKey, final XDSClient xdsClient)
        {
            return getXMLDocument(absoluteKey, xdsClient, false);
        }
    }

I want to mock static method getInstance(). I want getInstance() to return mock object of XDSUtilityManager class. Also I want to mock getXMLDocument() which is not static.

And in my testCase I tried following:

XMLDocument xmlDocument = PowerMock.createMock(XMLDocument.class);

XDSUtilityManager xdsUtilityManager  = PowerMock.createPartialMock(XDSUtilityManager.class,"getXMLDocument");

PowerMock.mockStaticPartial(XDSUtilityManager.class, "getInstance");
expect(XDSUtilityManager.getInstance()).andReturn(xdsUtilityManager).anyTimes();

expect(xdsUtilityManager.getXMLDocument((String)anyObject(), anyObject(XDSClient.class))).andReturn(xmlDocument).anyTimes();

PowerMock.replay(xdsUtilityManager);
PowerMock.replay(xmlDocument);

    public class XDSUtilityManager
    {

        private static XDSUtilityManager xdsUtilMgr = new XDSUtilityManager();
        private XDSUtilityManager()
        {
            xdsUtilMgrImpl = new XDSUtilityManagerImpl();
        }

        public static XDSUtilityManager getInstance()
        {
            return (xdsUtilMgr == null ) ? new XDSUtilityManager() : xdsUtilMgr;
        }
        public XMLDocument getXMLDocument(final String absoluteKey, final XDSClient xdsClient)
        {
            return getXMLDocument(absoluteKey, xdsClient, false);
        }
    }

But things are not working as expected. Please help

Answer 1

我发现这样做的最简单方法是使用PowerMockito.PowerMockito是Mockito和PowerMock的组合,它允许模拟静态对象.

我使用的模式是使用mock你的静态getInstance()来返回非静态模拟的副本,然后你可以正常扩展.使用PowerMockito的一个例子是:

@RunWith(PowerMockRunner.class)
@PrepareForTest({SingletonObject.class})
public class SingletonTester {
  @Mock
  private SingletonObject singleMock;

  @Before
  public void setup(){
      // initialize all the @Mock objects
      MockitoAnnotations.initMocks(this);
      // mock all the statics
      PowerMockito.mockStatic(SingletonObject.class);
  }

  @Test
  public void mockTester(){
      // Mock the static getInstance call to return the non-Static Mock
      Mockito.when(SingletonObject.getInstance()).thenReturn(singleMock);

      // Mock the non static version as normal
      PowerMockito.when(singleMock.nonStaticMethodCall()).thenReturn("Whatever you need.");
      //..........
  }
}

getInstance()获取singleton对象的静态调用将返回您定义的实例化模拟对象.一旦告诉静态返回什么,就可以继续正常模拟非静态调用.