I learn by example - and example practice is a technique of leveling up my skills. It works even better if you invite an expert to Pair-Program with you. Invite @LancerKind

This TDD.Academy video of David catching onto the Reverse TDD of his Legacy App code.
Watch it for your self - then practice - Reverse TDD.

After Reverse TDD <<=======<<<< Before REVERSE TDD - Xcode Diff.