January 2016
Intermediate to advanced
198 pages
3h 55m
English
Content preview from Frontend Architecture for Design Systems
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Chapter 14. Red Hat Testing
Visual Regression in Action
PhantomCSS has been my go-to tool for the past few years because it provides component-based comparison, with a headless browser and scripting library that can be integrated with my current build tools. So let me walk you through the setup of PhantomCSS and how we are currently using it at Red Hat.
The Testing Tools
PhantomCSS is a powerful combination of three different tools:
- PhantomJS is a headless WebKit browser that allows you to quickly render web pages, and most importantly, take screenshots of them.
- CasperJS is a navigation and scripting tool that allows you to interact with the page rendered by PhantomJS. We are able to move the mouse, perform clicks, enter text into fields, and even perform JavaScript functions directly in the DOM.
- ResembleJS is a comparison engine that can compare two images and determine if there are any pixel differences between them.
We also wanted to automate the entire process, so we pulled PhantomCSS into Grunt and set up a few custom Grunt commands to test all, or just part, of our test suite.
Setting Up Grunt
Now before you run off and download the first Grunt PhantomCSS you find on Google, I’ll have to warn you that it is awfully stale. Sadly, someone grabbed the prime namespace and then just totally disappeared. This has led to a few people taking it upon themselves to continue on with the codebase, merging in existing pull requests and keeping things current. One of the better ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.