This exercise helps you practice working in an unknown existing / legacy system, something you will be doing often as an engineer! You will learn one way to quickly work with an existing system, and how to safely make changes.

What you will practice:

• Test Driven Development
• Working in an existing codebase
• Refactoring techniques
• Safely making changes in an existing codebase

Set Up:

1. Clone Repo
   • *git clone [<https://github.com/emilybache/GildedRose-Refactoring-Kata.git>](<https://github.com/emilybache/GildedRose-Refactoring-Kata.git>)*
2. Open repo in VSCode, move into a language directory you are familiar with. For folks using JavaScript, use the js-jest directory
   • *cd GildedRose-Refactoring-Kata/js-jest*
3. Follow instructions in README to install dependencies, then run the test suite in watch mode
   • *npm run install*
   • *npm run test:watch*

VSCode Set Up:

1. Please install the Jest Runner VSCode Extension , which provides handy Run/Debug buttons above each jest test.

   

   https://marketplace.visualstudio.com/items?itemName=firsttris.vscode-jest-runner

   • Troubleshooting:

     • If you see the below issue when trying to click the debug button…

       

       • Fix, CMD SHIFT P and type >Shell command: Install 'code' command in PATH

         

       • Then close VSCode and restart the application. *It’s not enough to just “reload” the window.

Prompt:

The Gilded Rose has asked you to add a new feature to their existing Gilded Rose system. How do you plan on making changes while ensuring you don't break any existing functionalities?