September 2024
Intermediate to advanced
174 pages
3h 44m
English
Content preview from Test-Driven React, 2nd EditionBecome 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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Taking Snapshots of Styles
When you think of testing, you probably picture a list of assertions about your code, a sort of checklist of its functionality. Up to this point, all of the tests in this book have fit that description. But sometimes a picture is worth a thousand words. Or in this case, a piece of content generated by your code can be worth a thousand assertions. Seeing a diff of that content can bring your attention to problems you might never have thought to write an assertion for.
That’s the idea behind snapshots. When a test makes a snapshot assertion, it compares the content rendered in that test against a snapshot that was saved from a previous test run. If the assertion fails, you’re presented with a diff and the option to ...
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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.