Agreed, I really enjoyed working through this, haven't come across anything giving the the same level of context to, not only the why, but the how you got there

Agreed, I really enjoyed working through this, haven't come across anything giving the the same level of context to, not only the why, but the how you got there side of things as well. I wonder if the author would be interested in writing up something about unit tests / tdd in the same sort of fashion.