Setup

Install Ruby 2.4.1 and bundler, OS X instructions below:

brew install rbenv ruby-build

rbenv install # Uses version specified in .ruby-version
gem install bundler

Install the bundled gems and run the specs:

bundle install
bundle exec rspec

Focus: TDD, Refactoring, OOP, Legacy Code, Idiomatic Ruby

Modified version of: Jim Weirich's Gilded Rose Kata, itself a modified version of the orignal Gilded Rose Kata

Story

Hi and welcome to team Gilded Rose. As you know, we are a small inn with a prime location in a prominent city run by a friendly innkeeper named Allison. We also buy and sell only the finest goods. Unfortunately, our goods are constantly degrading in quality as they approach their sell by date. We have a system in place that updates our inventory for us. It was developed by a no-nonsense type named Leeroy, who has moved on to new adventures. Your task is to add the new feature to our system so that we can begin selling a new category of items. First an introduction to our system:

Requirements

• All items have a sell_in value which denotes the number of days we have to sell the item
• All items have a quality value which denotes how valuable the item is
• At the end of each day our system lowers both values for every item

Pretty simple, right? Well this is where it gets interesting:

• Once the sell by date has passed, quality degrades twice as fast
• The quality of an item is never negative
• Aged Brie actually increases in quality the older it gets
• The quality of an item is never more than 50
• Sulfuras, being a legendary item, has no sell by date nor decreases in quality
• Backstage Passes, like Aged Brie, increases in quality as its sell_in value approaches; quality increases by 2 when there are 10 days or less and by 3 when there are 5 days or less but quality drops to 0 after the concert

We have recently signed a supplier of conjured items. This requires an update to our system:

• Conjured items degrade in quality twice as fast as normal items

Feel free to make any changes to the update_quality method and add any new code as long as everything still works correctly. However, do not alter the Item class as it belongs to the goblin in the corner who will insta-rage and one-shot you as he doesn't believe in shared code ownership.

Just for clarification, an item can never have its quality increase above 50, however Sulfuras is a legendary item and as such its quality is 80 and it never alters.

Instructions

• Given the above requirements, update #update_quality in gilded_rose.rb to support Conjured items.
• Focus on refactoring the code
• Hint: Make use of gilded_rose_spec.rb.
• Be prepared to talk about your approach and resulting implementation.