“You’re going to have to rewrite code. All the time. You have to be ok with it. You have to be willing. This is the secret of the great programmers, and the great stumbling block of those new to refactoring and TDD.

The bad news: Refactorings like extract object will require you to test drive a new class from scratch. All the time.
The good news: It’s much easier to rewrite when you have tests. You just haven’t noticed yet.