如何对与第三方COM对象进行交互并实例化的代码进行单元测试？

One of the biggest issues currently holding me back from diving full steam into unit testing is that a really large percentage of the code I write is heavily dependent on third-party COM objects from different sources that also tend to interact with each other (I'm writing add-ins for Microsoft Office using several helper libraries if you need to know).One of the biggest issues currently holding me