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React 16 Tooling
book

React 16 Tooling

by Adam Boduch, Christopher Pitt
April 2018
Intermediate to advanced content levelIntermediate to advanced
298 pages
6h 34m
English
Packt Publishing
Content preview from React 16 Tooling

Isolate tests and run in parallel

Jest makes it easy to isolate your unit tests in a sandboxed environment. In other words, side-effects from running one test cannot impact the results of other tests. Each time a test run completes, the global environment is automatically reset for the next. Since tests are standalone and their execution order doesn't matter, Jest runs tests in parallel. This means that even if you have hundreds of unit tests you can run them frequently without the fear of having to wait.

Here's an illustration of how Jest runs tests in parallel, in their own isolated environment:

The best part is that Jest handles scaling ...

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Publisher Resources

ISBN: 9781788835015Supplemental Content