What We Just Learned
It might seem like the system we’ve been building here is just a toy. There aren’t any concrete components that a user could interact with yet: our CashSlot is just a plain old Ruby class, and there aren’t any buttons for the user to push. What we do have, though, are the beginnings of a domain model and a greater understanding of the problem. Outside-in doesn’t always mean starting with the user interface; it means starting with the outside of whatever you want to discover.
We know it is not always possible to work like this. You will often be adding tests to a legacy system or working on a project where the user interface is already well-defined by the time you are asked to develop the code. Even in these situations, ...
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