What You'll need
You can press the Download button on this page. Or if you have git installed you can run the following in your terminal.
After you have created a copy of this repository from github you will need to download and install Node.js from here
Install the Dependencies
# make sure you are in the project directory npm install
You are all set.
Commands to run the tests
All the prewritten tests can be run by executing the following in your project directory.
Testing in its simplest form is used to ensure your code is working correctly and help remove any potential bugs from your code.
So why is testing used here?
As a learner it will help you have a basis to work from and also aid in problem solving a big part of programming is essentially how to solve a problem, in addition to the above it helps you break down a problem into smaller parts.
All the tests have been created for you so that you can focus on learning.
Some awesome free resources you should check out.
Also Mozilla has a great reference at MDN