我可以使用doReturn将PowerMockito的退货链接起来吗？

问题描述

我有一个方法调用，它需要在第一次调用valueA时返回，而在第二次调用valueB时返回。我使用的是PowerMockito间谍，因此，如果我只需要返回一个值，它将看起来像这样：

I have a method call that needs to return valueA the first time it is called and valueB the second time it is called. I'm using a PowerMockito spy, so if I were just needing to return one value it would look like this:

PowerMockito.doReturn(valueA).when(mockedObject, "methodName");

看起来我可以像这样进行连锁回报：

It looks like I can do chained returns like this:

PowerMockito.when(mockedObject, "methodName").thenReturn(valueA).thenReturn(valueB);

但是我需要用doReturn指示链接的返回值，这样才不会调用真正的methodName（）我的间谍。

But I need to indicate chained returns with doReturn so that the real methodName() isn't called on my Spy.

我已经尝试过了，但是Eclipse给了我一个错误，说它甚至无法编译：

I've tried this, but Eclipse gives me an error saying that it won't even compile:

PowerMockito.doReturn(valueA).doReturn(valueB).when(mockedObject, "methodName");

是否甚至可以通过doReturn和powermockito链接回报？如果可以，怎么办？

Is it even possible to chain returns with doReturn and powermockito? If so, how?

推荐答案

我不这样认为。相反，您可以使用如下所示的doAnswer和Queue

I don't think so. Rather, You can achieve it with using doAnswer and Queue like below

@Test
public void testReturnChain() throws Exception {
    Example example = new Example() {
        public String getValue() {
            return null;
        }
    };
    Example mockExample = spy(example);
    PowerMockito.doAnswer(new Answer<String>() {
        private final Queue<String> values = new LinkedList<String>(Arrays.asList("firstValue", "secondValue"));

        public String answer(InvocationOnMock invocationOnMock) throws Throwable {
            return values.poll();
        }
    }).when(mockExample, "getValue");

    System.out.println(mockExample.getValue());
    System.out.println(mockExample.getValue());
    System.out.println(mockExample.getValue());
}

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