This is the sample code used in live coding demos for talks I've done around Test Driven Development.
There is more code yet to be used in talks in this repository.
(Christchurch APN, May 2012) http://www.slideshare.net/christensena/tdd-christchurch-apn-may-2012
Look out for RedGreenRefactor in the solution.
(Christchurch APN August 2013 and Christchurch Code Camp 2013) http://www.slideshare.net/christensena/chch-apn-aug-2013
Look out for CollaboratingClasses in the solution.