CJ Shopping Cart

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)
These examples confuse me a bit. If I add 0, I should have 1 in my cart? If I add five items of $100.00 apiece, there should be five, but my total should still only be $100? What's the deal on these?