java - 为什么 Powermockito 调用我的模拟方法？

Question

我想模拟私有(private)方法，它从我的测试方法中调用，但 PowerMockito 不是模拟，而是调用 toMockMethod，然后我得到了 NPE。 toMockMethod 位于同一个类中。

@RunWith(PowerMockRunner.class)
public class PaymentServiceImplTest {

    private IPaymentService paymentService;

    @Before
    public void init() {
        paymentService = PowerMockito.spy(Whitebox.newInstance
                (PaymentServiceImpl.class));
        MockitoAnnotations.initMocks(this);
    }

    @Test
    public void test() throws Exception {
        ...
        PowerMockito.doReturn(mockedReturn)
                .when(paymentService,
                      "toMockMethod",
                      arg1, arg2);
    }
}

这是正常情况吗？如果方法已被调用，那么模拟方法有什么意义？

Answer 1

要使用 PowerMock 对类启用静态或非公共(public)模拟，应将该类添加到注释 @PrepareForTest 中。在你的情况下，它应该是:

@RunWith(PowerMockRunner.class)
@PrepareForTest(PaymentServiceImpl.class)
public class PaymentServiceImplTest {

    private IPaymentService paymentService;

    @Before
    public void init() {
        paymentService = PowerMockito.spy(Whitebox.newInstance
                (PaymentServiceImpl.class));
        MockitoAnnotations.initMocks(this);
    }

    @Test
    public void test() throws Exception {
        ...
        PowerMockito.doReturn(mockedReturn)
                .when(paymentService,
                      "toMockMethod",
                      arg1, arg2);
    }
}