Testing your upgrade path

Hi all,

I wrote a blog post about testing contributed modules' upgrade and update paths:

http://www.koumbit.org/en/articles/automatic-testing-your-drupal-update-...

As I haven't found a lot of information about this on the web, any comments and suggestions would be greatly appreciated. I'd also like to know if any of you do this, and how you go about it.

Cheers,

Albert