Unfortunately, this is not possible in the current version of JustMock. It is impossible to arrange the base method of an overriden virtual method right now. I've logged an issue aboout this and it should be fixed in one of our upcoming releases. Please note, however, that intercepting base virtual methods (like Class1.Method1 in your example) will require the profiler to be enabled - it will not work with JustMock Lite.
Unfortunately, I cannot provide you with a workaround. I suggest you test this specific behavior by means other than JustMock.
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