A toy example checkout machine for certified scrum developer (CSD)

You are a customer at a self-checkout market. You scan the stock keeping unit (SKU) of each product and review the total price you need to pay.

If you have a bonus card, you can scan your bonus card to receive discounts.

Current deals with the bonus card include 1/2 off salsa as well as buy 2, get 1 free chips.

There is a 50 cents surcharge for tobacco products.

All scanned products must make a call to a remote inventory control system that logs the scanned products for inventory control purposes (assume a REST webservice call).

A seperate call is also made to an id verification system that returns whether to prompt for id or not.

The store currently sells the following products:

class SelfCheckoutMachine
  def scan(sku)
    # scans a single item
  end
  
  def total
    # returns the total of all scanned 
    # items with discounts/taxes applied
  end
end

Any tests should live in the /tests folder.

To run tests, use rake test or rake

$ rake
Run options: --seed 51276

# Running:

..........

Finished in 0.001012s, 9884.4314 runs/s, 9884.4314 assertions/s.

10 runs, 10 assertions, 0 failures, 0 errors, 0 skips