rudyyazdi / shopping

assumptions:

• One VGA adapter needs to be scanned per MacBook Pro otherwise there is no discount.
• All the prices are in cents for simplicity.

notes:

• The stipulated pricing rules are implemented in DefaultPricingRule. In case the pricing rules change, another subclass of BasePricingRule can be created and populated with the new default prices and policies.
• Policies are also extensible in a way that new policies can be added the just need to implement the apply method that takes a item_array and modifies the pricings of the items.
• The following test scenarios are implemented as integration test in spec/lib/checkout_spec.rb:
  • SKUs Scanned: atv, atv, atv, vga Total expected: $249.00
  • SKUs Scanned: atv, ipd, ipd, atv, ipd, ipd, ipd Total expected: $2718.95
  • SKUs Scanned: mbp, vga, ipd Total expected: $1949.98