Visual Regression Testing with PhantomCSS

@jonbellah - jonbellah.com/talks/js-summit Regression Testing with PhantomCSS Visual

@jonbellah - jonbellah.com/talks/js-summit Lead Front End Engineer @jonbellah

@jonbellah - jonbellah.com/talks/js-summit DISCLAIMER

@jonbellah - jonbellah.com/talks/js-summit Regression Testing with my personal favorite tool
Visual

@jonbellah - jonbellah.com/talks/js-summit selenium wraith succss siteeffect huxley dpxdt css
critic shoov snap and compare cactus hardy applitools specter needle

@jonbellah - jonbellah.com/talks/js-summit ? What the heck is Visual Regression
Testing

@jonbellah - jonbellah.com/talks/js-summit visual changes Automated testing of

@jonbellah - jonbellah.com/talks/js-summit

@jonbellah - jonbellah.com/talks/js-summit “But I change CSS because I want
things to look different…”

@jonbellah - jonbellah.com/talks/js-summit ? important So why is this

@jonbellah - jonbellah.com/talks/js-summit projects refactoring

@jonbellah - jonbellah.com/talks/js-summit projects distributed

@jonbellah - jonbellah.com/talks/js-summit projects open source

@jonbellah - jonbellah.com/talks/js-summit helps prevent unintended changes

@jonbellah - jonbellah.com/talks/js-summit automate your workflow

@jonbellah - jonbellah.com/talks/js-summit Manual testing is expensive

@jonbellah - jonbellah.com/talks/js-summit is imperfect Manual testing

@jonbellah - jonbellah.com/talks/js-summit attention to detail” “but I have excellent

@jonbellah - jonbellah.com/talks/js-summit Actually…

@jonbellah - jonbellah.com/talks/js-summit TERRIBLE Humans are at spotting changes

@jonbellah - jonbellah.com/talks/js-summit Whodunnit? (video)

@jonbellah - jonbellah.com/talks/js-summit & McConkie Currie 1996

@jonbellah - jonbellah.com/talks/js-summit Change Blindness

@jonbellah - jonbellah.com/talks/js-summit A perceptual phenomenon that occurs when changes
in a visual stimulus is made without the observer noticing Source: Wikipedia

@jonbellah - jonbellah.com/talks/js-summit 20% of an image can change without
the observer noticing

@jonbellah - jonbellah.com/talks/js-summit The Tools

@jonbellah - jonbellah.com/talks/js-summit PhantomCSS https://github.com/Huddle/PhantomCSS

@jonbellah - jonbellah.com/talks/js-summit PhantomJS or SlimerJS - A headless browser.

CasperJS - Navigation scripting and testing utility.

CasperJS - Navigation scripting and testing utility. ResembleJS - A library for making image comparisons.

@jonbellah - jonbellah.com/talks/js-summit GruntJS

@jonbellah - jonbellah.com/talks/js-summit The Implementation

@jonbellah - jonbellah.com/talks/js-summit Grunt setting up

@jonbellah - jonbellah.com/talks/js-summit $ cd path/to/your-project

@jonbellah - jonbellah.com/talks/js-summit $ npm install @micahgodbolt/grunt-phantomcss --save-dev

@jonbellah - jonbellah.com/talks/js-summit grunt.loadNpmTasks('@micahgodbolt/grunt-phantomcss'); grunt.initConfig({ phantomcss: { desktop: { options:
{ screenshots: 'baselines/desktop', results: 'results/desktop', viewportSize: [1280, 800] }, src: [ 'test/visual/start.js', 'test/visual/*-test.js' ] } } });

@jonbellah - jonbellah.com/talks/js-summit options: { screenshots: 'baselines/desktop', results: 'results/desktop', viewportSize:
[1280, 800], mismatchTolerance: 0.05, rootUrl: 'http://localhost:3000/' // Optional }

@jonbellah - jonbellah.com/talks/js-summit Testing Different Breakpoints

@jonbellah - jonbellah.com/talks/js-summit $mq-breakpoints: ( mobile: 320px, tablet: 740px, desktop:
980px, wide: 1300px ); Sass MQ

@jonbellah - jonbellah.com/talks/js-summit phantomcss: { desktop: { options: { screenshots:
'baselines/desktop', results: 'results/desktop', viewportSize: [1024, 768] } }, mobile: { options: { screenshots: 'baselines/mobile', results: 'results/mobile', viewportSize: [320, 480] } } }

@jonbellah - jonbellah.com/talks/js-summit Writing Your First Tests

@jonbellah - jonbellah.com/talks/js-summit phantom.casperTest = true; casper.start(); start.js

@jonbellah - jonbellah.com/talks/js-summit phantom.casperTest = true; casper.start(); start.js src: [
'test/visual/start.js', 'test/visual/*-test.js' ] Gruntfile.js

@jonbellah - jonbellah.com/talks/js-summit casper.thenOpen('http://mysite.dev/') .then(function() { phantomcss.screenshot('.site-header', 'site-header'); }); header-test.js

@jonbellah - jonbellah.com/talks/js-summit Test Suite Structure

@jonbellah - jonbellah.com/talks/js-summit focus on components

@jonbellah - jonbellah.com/talks/js-summit Scripting Interactions

@jonbellah - jonbellah.com/talks/js-summit CasperJS

@jonbellah - jonbellah.com/talks/js-summit casper.click(); casper.download(); casper.fill(); casper.scrollTo(); casper.reload(); casper.mouseEvent(); docs.casperjs.org

@jonbellah - jonbellah.com/talks/js-summit casper.then(function() { this.mouse.move('.button'); phantomcss.screenshot('.button'); });

@jonbellah - jonbellah.com/talks/js-summit casper.start('http://mysite.dev/wp-admin/', function() { this.fill('form#loginform', { 'log': 'admin',
'pwd': 'password' }, true); this.click('#wp-submit'); });

@jonbellah - jonbellah.com/talks/js-summit Running Your Tests

@jonbellah - jonbellah.com/talks/js-summit $ grunt phantomcss

@jonbellah - jonbellah.com/talks/js-summit Failing Tests

@jonbellah - jonbellah.com/talks/js-summit visual regression testing tools ARE NOT PERFECT

@jonbellah - jonbellah.com/talks/js-summit Challenges

@jonbellah - jonbellah.com/talks/js-summit 1 content dynamic

@jonbellah - jonbellah.com/talks/js-summit replacement dynamic

@jonbellah - jonbellah.com/talks/js-summit Faker.prototype.home = function( posts ) { var
$ = jQuery, post = posts[5]; var title = post.title, author = post.author.name, date = post.date, excerpt = post.excerpt; // Hero var $hero = $('#hero'); $hero.find('.-text .entry-title').html( title ); $hero.find('.-text .author > a').html( author ); $hero.find('.-text .entry-content p').html( excerpt ); }

@jonbellah - jonbellah.com/talks/js-summit var core = require( './core.js' ), Faker
= require( ‘./faker.js’), posts = core.getData(), faker = new Faker(); casper.thenOpen( core.getSiteURL() ) .thenEvaluate( faker.home, posts ) .then( function() { phantomcss.screenshot( '#hero .-text', 'hero- post' ); });

@jonbellah - jonbellah.com/talks/js-summit guides style

@jonbellah - jonbellah.com/talks/js-summit mdcss

@jonbellah - jonbellah.com/talks/js-summit /*--- title: Buttons section: Base CSS ---
Button styles can be applied to any element. Typically you'll want to use either a `<button>` or an `<a>` element: ```example:html <button class="btn">Click</button> <a class="btn" href="/some-page">Some Page</a> ``` */ .btn { background-color: black; color: white; }

@jonbellah - jonbellah.com/talks/js-summit 2animations & web fonts

@jonbellah - jonbellah.com/talks/js-summit 3 distribution

@jonbellah - jonbellah.com/talks/js-summit LOCAL URL not everyone uses the same

@jonbellah - jonbellah.com/talks/js-summit var localURL = grunt.option( 'url' ); grunt.registerTask(
'test', function() { if ( localURL ) { grunt.log.writeln( 'Local URL: ' + localURL ); grunt.file.write( 'test/visual/.local_url', localURL ); } grunt.task.run(['phantomcss']); });

@jonbellah - jonbellah.com/talks/js-summit var fs = require('fs'), siteURL; try {
siteURL = fs.read( 'test/visual/.local_url' ); } catch(err) { siteURL = (typeof siteURL === 'undefined') ? 'http://local.wordpress.dev' : siteURL; } casper.thenOpen(siteURL + '/path/to/template');

@jonbellah - jonbellah.com/talks/js-summit OPERATING SYSTEM not everyone uses the same

@jonbellah - jonbellah.com/talks/js-summit CAUTION WORK IN PROGRESS

@jonbellah - jonbellah.com/talks/js-summit Questions?

Visual Regression Testing with PhantomCSS

Visual Regression Testing with PhantomCSS

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