Raspberry Pi Technical Test

Setup

1. Install Ruby 4.0.5 and bundler using your preferred method.

2. Run:

$ bundle install

Run Tests

$ rake test

Notes

• I'm storing the prices as an integer number of pennies. This avoids any rounding issues with floats. Other options might be BigDecimal or using the money gem.

• I've implemented the promotions as an overrideable sum proc on each product. This works well but wouldn't really be practical for a user to administer in any way.

• The buy_one_get_one_free promotion proc could probably be refactored to be a buy_x_get_one_free method, but this would make the maths more complicated.

• There is currently no way to remove a product from the checkout. We can implement a #remove method easily enough.

• There are currently no tests for the Promotions module. I would have added some if I'd had more time.

New Requirements

• If you buy a Raspberry Pi 5, and a Zero 2W, you get £5 discount