You'll need to have Node.js installed on your machine. If don't have it, go to the Node.js website and download it to your machine.
Clone this repository on your machine, cd into de folder and run npm install.
Run npm run dev and check it out in your browser using the url http://localhost:8080.
Once you run npm test for the first time, you'll notice a new folder named test is created inside the root directory. Don't modify it manually. Write your tests inside the src directory, in a sibling file named <some_name>.spec.js next to the <some_name>.js file with code you want to test.
To get your tests running on the fly everytime you modify your source or test files, run npm run dev or npm run watch:test.