April 2018
Intermediate to advanced
298 pages
6h 34m
English
Content preview from React 16 Tooling
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Mock everything except the application code
The last thing you want to spend time on is testing someone else's code. Yet, sometimes you're forced to do exactly that. For example, let's say that you want to test a function that makes a fetch() call to some HTTP API. Another example: your React component uses some library to help set and manipulate its state.
In both of these examples, there's code that you didn't implement that's being run when your unit tests run. You definitely don't want to reach out to an external system over HTTP. You definitely don't want to make sure that the state of your component is being set correctly based on the output of functions from another library. For the code that we don't want to test, Jest provides a ...
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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.