Testing Pushkin with Jest

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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.js
 module.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.
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