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Visual E2E Testing

🧠You will learn

✅What is visual E2E testing?

✅How to implement visual e2e using WebdriverIO + Screener

How do we check to make sure that the app looks as expected on web and mobile?

What is visual testing?

A bit about webdriverIO

Set up a visual test

  1. Create a new file my-react-app/test/specs/exercise.spec.js
  2. Paste the following code
describe('My React application', () => {
    it('should look correct', () => {
        browser.url(`/`);
        browser.execute('/*@visual.init*/', 'My React App');
        browser.execute('/*@visual.snapshot*/', 'Home Page');
    });
});
  1. npm run test:visual
  2. View your results in Screener.io

🏋️‍♀️ Expand the config to cover iOS and Android

In today's day and age, everything must be responsive, so let's make sure that our app looks good on iOS web. Hint, use these capabilities in wdio.conf.js:

        //iphone X
        {
            browserName: 'safari',
            platformName: 'macOS 10.15',
            browserVersion: 'latest',
            'sauce:options': {
                ...sauceOptions,
            },
            'sauce:visual': {
                ...visualOptions,
                viewportSize: '375x812'
            }
        }

🏋️‍♀️❓ Let's change our image, what tests should that break❓

We're going to update the React image to something better. What tests should break?

  • Drag n drop a new image to the /src
  • Fix the path to be correct here import logo from './mia.jpg'; in App.js
  • Save all files
  • Stop the app ctrl + C
  • Restart the app with npm start
  • Rerun the visual tests with npm run test:visual
  • Analyze the results in Screener dashboard

❓Is our app fully tested now❓

Expected Behavior Tested? Test Type Technologies
Application renders ✅ Component React testing library, Jest
Learn React link goes to correct location ✅ Component React testing library, Jest
Learn React link opens in new tab ✅ Component React testing library, Jest
App looks as expected on web and mobile ✅ Visual Screener,WebdriverIO
Front-end performance is at least a B 🙅‍♂️
App is secure 🙅‍♂️

📝Summary

✅Visual e2e testing is a simple and efficient way to test your web app cross-platform

✅We used WebdriverIO + Screener.io to write our visual e2e tests

Wouldn't it be great to have this tested automatically through CI?

Let's setup up CI