June 2019
Intermediate to advanced
192 pages
4h
English
Content preview from Test-Driven ReactBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Introducing Jest
Jest is a test framework developed by Facebook. Thanks to its zippyness and rich feature set, it’s quickly become the de facto standard for testing React apps. It’s catching on outside of the React ecosystem, too.
Unlike its forerunners (notably Jasmine), which expect to run in a browser environment, Jest runs in a Node.js process. That may seem counterintuitive: Shouldn’t code written to be run in the browser be tested in the browser? Short answer: not anymore! It’s become possible to simulate browser APIs in Node.js, thanks to a miraculous library called jsdom.[6] The advantages of using a simulated browser environment in Node are huge: tests can be run much more quickly, code coverage can be calculated easily, and the same ...
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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.