ltello / checkout

CHECKOUT

This Ruby code implements a checkout system with promotion rules on products.

Here is a sample of some of the products available:

Product code  | Name                   | Price
----------------------------------------------------------
001           | Lavender heart         | £9.25
002           | Personalised cufflinks | £45.00
003           | Kids T-shirt           | £19.95

These are the discount rules to apply:

If you spend over £60, then you get 10% of your purchase.
If you buy 2 or more lavender hearts then the price drops to £8.50.

Implementation

The implementation is based on several Ruby classes:

• Promotion superclass that implements common behaviour to specialized discount classes.

• LavenderPair promotion subclass implements the computation and discount applicable to each pair of Lavander products.

• Over60 promotion subclass implements the computation and discount applicable totals over 60 pounds.

• Item class implements a basic item concept with name and price.

• Checkout class implements the checkout process. Scan of items and computation of total price with promotions applied.

Installation

Clone the code from Checkout

Install Ruby 2.6.4

If Ruby runtime is not installed in your machine, please install it first. Some popular ruby version managers might be helpful: rbenv, rvm

Install dependencies

You will need Bundler gem to install Ruby dependencies. In the root directory where you the code is installed check it is installed and accessible typing:

bundle install

Run the code

irb
require "./co" 
item1 = Item.new(name: "Lavender heart", price: 9.25)
item2 = Item.new(name: "Personalised cufflinks", price: 45.00)
item3 = Item.new(name: "Kids T-shirt", price: 19.95)

Now you try the following checkout example:

co = Checkout.new([LavenderPair, Over60])
co.scan(item1)
co.scan(item2)
co.scan(item3)
co.total

You should get 66.78

Other examples:

Basket: 001,003,001
Total price expected: £36.95

Basket: 001,002,001,003
Total price expected: £73.76

Run the test suite

In the root folder where you installed the code, type:

rspec

You can check test coverage if you type this after running rspec:

open coverage/index.html