12 test-driven programming exercises set by John Cleary over Christmas 2012 / January 2013 - http://www.wiredtothemoon.com/2012/12/12-tdds-of-christmas/

1. Calc Stats
2. Number Names
3. Mine Field
4. Monty Hall
5. Fizz Buzz
6. Recently-Used List
7. Template Engine
8. Range
9. Bowling Game
10. Phone Numbers
11. Poker Hands
12. Harry Potter