Simple script to start up Chrome with Selenium, run an operation, take a screenshot and exit

selenium-js-example.js

const fs = require('fs');
const selenium = require('selenium-standalone');
const webdriver = require('webdriverio');

installSelenium()
.then(startSelenium)
.then(runTest)
.then(stopSelenium);

function installSelenium() {
    return new Promise(resolve => {
        selenium.install({
            logger: msg => console.log(msg)
        }, resolve);
    })
}

function startSelenium() {
    return new Promise((resolve, reject) => {
        console.log('Visual Regression: Starting selenium');
        selenium.start(function (err, child) {
            if (err) return reject(err);
            selenium.child = child;
            resolve();
        });
    });
}

function runTest() {
    return new Promise((resolve, reject) => {
        console.log('Visual Regression: Opening Chrome');
        const browser = webdriver.remote({
            desiredCapabilities: {
                browserName: 'chrome'
            }
        }).init();

        browser.url('http://webdriver.io')
        .then(()=> browser.getTitle())
        .then(title => console.log('Title', title))
        .then(()=> browser.keys('ArrowDown'))
        .then(()=> browser.saveScreenshot())
        .then(image => fs.writeFileSync('./myShot.png', image))
        .then(()=> console.log('Screeny!'))
        .then(browser.end)
        .then(resolve)
        .catch(reject);
    });
}

function stopSelenium() {
    return new Promise(resolve => {
        console.log('Visual Regression: Stopping selenium');
        selenium.child.kill();
        resolve();
    });
}