How does TDD make refactoring easier?

Question

I\'ve heard that projects developed using TDD are easier to refactor because the practice yields a comprehensive set of unit tests, which will (hopefully) fail if any change has

Answer 1

TDD says write a failing test first. The test is written to show that the developer understands what the use case/story/scenario/process is supposed to achieve.

You then write the code to meet the test.

If the requirement changes or has been misunderstood, edit or rewrite the test first.

Red-bar, Green-bar, right?

Fowler's Refactoring is the reference for refactoring, strangely enough.

Scott Ambler's series of articles in Dr. Dobb's ('The Agile Edge??') is a great walkthrough of TDD in practice.