Testing VSTO Applications?

Question

I'm developing a Word 2007 VSTO application in VS2008. The part of the application that interacts with VSTO is difficult to test. VSTO objects behave differently than most class libraries. Their state and behaviors depend on how the user is interacting with Word, where they clicked, what's around the insertion point, etc. Mock objects could work in some scenarios, but they don't capture many of the subtleties of the VSTO objects.

Anyone have any experience with testing a VSTO based application they can share?

Answer 1

Use encapsulation to separate your logic from the API code. It is a very similar to how you unit test code that interacts with your database. Generally you can trust the API will work, like the database, but it is your logic that needs to be isolated so you can test it properly.