An after-the-fact test suite is a different beast than one written concurrently with the app. It's not worth trying to force one to be the other. Work from the

An after-the-fact test suite is a different beast than one written concurrently with the app. It's not worth trying to force one to be the other. Work from the outside in, keeping most of the system as a black box. Start with testing the highest-level behaviors that the business/users care about.