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​Jest is a JavaScript library for creating, running, and structuring tests.
Install Jest using yarn
:
$ yarn add --dev jest
To use Babel, install required dependencies via yarn
:
$ yarn add --dev babel-jest @babel/core @babel/preset-env
Configure Babel to target your current version of Node by creating a babel.config.js
file in the root of your project:
// babel.config.jsmodule.exports = {presets: [['@babel/preset-env',{targets: {node: 'current',},},],],};
The ideal configuration for Babel will depend on your project. See Babel’s docs for more details.
To learn more about testing, go to Jest official documentation.