使用 PowerMock 模拟在被测 class 的构造函数中调用的私有方法

Question

我不知道 Powermock 是否可行。我需要使用 Powermock 来模拟在我需要测试的 class 的构造函数中调用的私有方法。所以我有一个这样的测试class：

@RunWith(PowerMockRunner.class)
@PrepareForTest(XMLTransaction.class)
public class CloseSummaryOrCloseTrailerResponseTest {
    public final static String URL="WL_APPSERVER";
    private XMLTransaction xmlTransaction; 

    @Before
    public void initMocks() throws Exception {
        xmlTransaction = PowerMockito.spy(new XMLTransaction(URL)); 
        PowerMockito.doAnswer(new org.mockito.stubbing.Answer<Object>() {
            @Override
            public Object answer(InvocationOnMock invocation) throws Throwable {
                return null; //does nothing
            }
        }).when(xmlTransaction.getClass(), "initialize");
        PowerMockito.doNothing().when(xmlTransaction.getClass(), "initialize");             
    }

    @Test
    public void whenCloseSummaryResponseNoErrorExpectCorrectXmlMsgProduced () throws Exception
    {
    //set the mock object here
        try {                    
            String actualXmlScannerMsg = xmlTransaction.closeSummaryResponseToXMLNoErrors(mockCloseTrailerResponse);
            Assert.assertNotNull(actualXmlScannerMsg);
            Assert.assertEquals(msgNoCarReturnCharCloseSummaryResponse, actualXmlScannerMsg);   
        }
        catch(JsonProcessingException jEx)
        {
            Assert.fail("JsonProcessingException: " + jEx.getMessage());
        }
        catch(Exception ex)
        {
            Assert.fail("Exception occurred: " + ex.getMessage());
        }
    }
}

创建间谍时出现空指针异常。构造函数 new XMLTransaction(URL) 调用 initialize 方法，这是我什么都不做的方法。

有什么办法可以解决这个问题。如果我使用默认构造函数，则不会创建 class。

Answer 1

我想通了... 我创建了一个默认构造函数并将初始化方法中实例化的所有类设置为 null。从 initMock()

中删除了这个

PowerMockito.doAnswer(new org.mockito.stubbing.Answer<Object>() {
            @Override
            public Object answer(InvocationOnMock invocation) throws Throwable {
                return null; //does nothing
            }
        }).when(xmlTransaction.getClass(), "initialize");
        PowerMockito.doNothing().when(xmlTransaction.getClass(), "initialize");

使用 PowerMock 模拟在被测 class 的构造函数中调用的私有方法

Using PowerMock to mock a private method called in the constructor of the class under test

java

junit4

powermockito