是否可以有一个可空的ArgumentCaptor？
我正在尝试使用下面的方法

public Win getWin() {
        ArgumentCaptor<Win> winCaptor = ArgumentCaptor
                .forClass(Win.class);
        Mockito.verify(producer, Mockito.atMostOnce()).accept(winCaptor.capture());
        return winCaptor.getValue();
    }

当producer.accept(win)被调用的时候，这个方法很好用，但是我希望它返回null，如果不是的话，这可行吗？
我目前得到这个错误

No argument value was captured!
You might have forgotten to use argument.capture() in verify()...
...or you used capture() in stubbing but stubbed method was not called.
Be aware that it is recommended to use capture() only with verify()