fast.js

'use strict';
const jsdom = require('jsdom');

jsdom.env({
    url: 'http://fast.com/',
    scripts: ['http://code.jquery.com/jquery.js'],
    userAgent: 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36',
    strictSSL: false,
    features: {
        FetchExternalResources: ['script'],
        ProcessExternalResources: ['script']
    },
    done: (err, window) => {
        if (err) {
            throw err;
        }

        setTimeout(() => {
            console.log('Speed:', window.$('#speed-value').text().trim(), window.$('#speed-units').text().trim());
        }, 5000);
    }
});