Refactoring legacy code driven by tests (II)

We'll work again in the first of Luca Minudel's refactoring legacy code exercises but this time using a dynamic language. See here what we did the last time using Java: http://bit.ly/1BxaaaJ

It's a guided kata. I'll code and explain what I'm doing at the same time. It would be the same exercise that we did last time, except that the techniques used are somehow different in a dynamic language.