Now that you have Node and NPM installed and up-to-date, turn your attention to the application you want to test drive. Due to its constantly increasing popularity, we are choosing to explain and demonstrate Test-Driven Development by testing a React application.

According to the React website, React is A JavaScript library for building user interfaces. We are going to focus on using it for a front-end browser application, but it can be used to create mobile and desktop applications as well.

React was created and is maintained by Facebook. React was created to solve issues that Facebook had in its own user interface, and it is now taking the internet by storm. Facebook has also created a library called Create React App to quickly get a React application going.