May 2018
Intermediate to advanced
470 pages
13h 54m
English
Content preview from Full-Stack React Projects
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Generating a snapshot of the correct Post view
The first time this test is run, we will provide it with the values required to generate the correct snapshot of the Post view. The correct snapshot for this test case will contain the delete button when the user._id of the auth object is equal to the postedBy value of the post object. This snapshot generated when the test is first run will be used for comparison for future test executions.
Snapshot testing in Jest basically records snapshots of rendered component structures to compare them to future renderings. When the recorded snapshot and the current rendering don’t match, the test fails, indicating that something has changed.
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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.