Install Jest

This course is all about unit testing with Jest and in this lesson, we'll learn how to install Jest in our project.

To get started, we need a package.json. Go to your project directory and run the following commands in your terminal:

yarn init -y
```
Then we need to install Jest:

yarn add --dev jest

Add support for babel:

yarn add --dev babel-core babel-jest babel-preset-env

Create a babel preset file:

touch .babelrc

And add the current preset, to `.babelrc`:

{ "presets": [ "env" ] }

And voilà, Jest is installed!