> You write a tiny bit of test, then a tiny bit of implementation to satisfy the test. If you notice something you'd missed previously, you refactor BOTH tests

> You write a tiny bit of test, then a tiny bit of implementation to satisfy the test. If you notice something you'd missed previously, you refactor BOTH tests and implementation. Bingo! Exactly that. Right on the money, especially the part about refactoring both tests and implementation.