PowerMockito问题解决一则

when(spy.checkMasterSlaveNumber(Mockito.anyList(), Mockito.anyMap())).thenReturn(appMasterSlaveArrayList);

//用
	doReturn(fooBar).when(bar).getFoo()
    
//代替
	when(bar.getFoo()).thenReturn(fooBar)

Hi,

Well actually the issue in your code resides with the spy.
问题处在你代码中的spy上

Here is the explanation what's happening with your code.
解释下

A spy actually execute the real code by nature, so when calling "out.produce()" the expression is actually executed and return a real Product.
一个spy对象实际上会正常执行真实代码，所以你调用out.product()方法时，表达式是真时执行并且返回了一个真实的Product对象。

The constructor of Product takes the constructor arg "foo" which is a mock and it executes "f.getBar()". This invocation is recorded by mockito because this "foo" instance is a mock.
Then when you want to return "mpoo", mockito raises the exception WrongTypeOfReturnValue saying that the recorded invocation "foo.getBar()" cannot return a Product.
Product类的构造方法的构造参数 foo 是一个模拟对象，他执行了 f.getBar方法。这次调用被mockito记录了因为foo对象实例是一个模拟对象。因此当你想要返回Mpoo对象时，mockito举出WrongTypeOfReturnValue异常来标明被记录的"foo.getBar()"调用不能返回一个Product对象。


If you want to mack a partial mock, which you should avoid if possible. You need to use the following style for spies, this way mockito can tell the spy instance to only record the invocation.
如果你想要部分模拟，虽然你应该尽量避免。你应该使用以下语法，这种方式可以让spy实例只记录调用。

doReturn(mpoo).when(out).produce();

Hope that helps.

-- 
Brice

//原
when(spy.checkMasterSlaveNumber(Mockito.anyList(), Mockito.anyMap())).thenReturn(appMasterSlaveArrayList);
//改后
doReturn(appMasterSlaveArrayList).when(spy).checkMasterSlaveNumber(anyList, anyMap);