How to unit test Excel VBA code

Question

Does anyone have any experience with unit testing Excel VBA code? I want to introduce unit tests into some legacy Excel VBA code as painlessly as possible. One idea I had would

Answer 1

I was just looking for the same thing and found: http://accunit.access-codelib.net/ which integrates into the VBA IDE quite nicely.

Note: Viewing the page in German and using the browser translation tools seems to yield more info than the English pages.