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First review. Please please ignore the step_definitions files as I only included them to see how cucumber works, and to make it a heck of a lot easier for me to not repeat myself in steps (RubyMine)
Now that I think about it, the other test about setting product quantity to zero (in the remove items feature) really belongs here. Even though the implicit action of the feature is to remove an action, it uses the same mechanisms and such as the features here.

Otherwise, this feature separation is actually really good.