How do I prevent my unit tests from requiring knowledge about implementation internals when using mock objects?

I\'m still in the learning stages regarding unit-testing and in particular regarding mocking (I\'m using the PascalMock and DUnit frameworks). One thing I now stumbled over was that I couldn\'t find a

How do I mock a method with an open array parameter in PascalMock?

I\'m currently in the process of getting started with unit testing and mocking for good and I stumbled over the following method that I can\'t seem to fabricate a working mock implementation for:

等着你的开门音乐是什么歌？