checkout-machine
A toy example checkout machine for certified scrum developer (CSD)
Problem
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.
Products
The store currently sells the following products:
| Name | SKU | Price (in cents) |
|---|---|---|
| Chips | 123 | 200 |
| Salsa | 456 | 100 |
| Wine | 1000 | 1000 |
| Cigarettes | 111 | 500 |
Design
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
Running Tests
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