#About This was built with the following in mind:
Our marketing team want to offer promotions as an incentive for our customers to purchase these items.
If you spend over £60, then you get 10% off your purchase If you buy 2 or more travel card holders then the price drops to £8.50.
Our check-out can scan items in any order, and because our promotions will change, it needs to be flexible regarding our promotional rules.
The checkout test can be run by running:
rspec spec/checkout_spec.rb