Test It Out Choose an application you built in Intro (such as Roman Numeral, Pig Dice, or Triangle Tracker). Refactor the application to include the following: Complete unit tests with Jest. Aim for 100% test coverage. Complete separation of logic (UI logic in one file, business logic in another). You may even need to refactor some of your logic to make it more testable! If you aren’t able to test UI logic, consider ways that logic could be refactored and moved into your business logic file. Practice with Jest and testing is your top priority!