September 2017
Intermediate to advanced
120 pages
2h 47m
English
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Test Component Boundaries
One common pattern that we have used in the word counter is lifting the state into a parent component and updating its children via props. A good way to test is to instantiate the parent component, trigger some events on it, and check whether the children update correctly.
For this type of test, it’s enough to render a component and its immediate children. Skipping the creation of the whole DOM structure will speed up the tests considerably. To perform this shallow rendering, we’ll use a library called Enzyme.[16] We’ll construct an element and its immediate children, then simulate the user interaction on the parent, and check that the changes propagate correctly to the children.
Start by installing Enzyme and its dependency ...
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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.