###### tags: `TDD` `testing`

# Another precious TDD exercise by Kent Beck


Let's say you interested in TDD but you just can't figure out how to write a test before you write the code.
Here's a foolproof exercise that let's you experience the TDD workflow in spite of that block:

1. Change the code as usual
2. Write a test that only passes after the change
3. Revert to before 1
4. Type the test again (copy/paste is cheating & invalidates the warranty of the exercise)
5. Make it compile by changing the code
6. See it fail
7. Change the code to make it pass

(original tweet: https://twitter.com/KentBeck/status/1421257650113634304?)