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69060e1da6
* Swap expect(ReactNoop) for expect(Scheduler) In the previous commits, I upgraded our custom Jest matchers for the noop and test renderers to use Scheduler under the hood. Now that all these matchers are using Scheduler, we can drop support for passing ReactNoop and test roots and always pass Scheduler directly. * Externalize Scheduler in noop and test bundles I also noticed we don't need to regenerator runtime in noop anymore.
react-test-renderer
This package provides an experimental React renderer that can be used to render React components to pure JavaScript objects, without depending on the DOM or a native mobile environment.
Essentially, this package makes it easy to grab a snapshot of the "DOM tree" rendered by a React DOM or React Native component without using a browser or jsdom.
Documentation:
https://reactjs.org/docs/test-renderer.html
Usage:
const ReactTestRenderer = require('react-test-renderer');
const renderer = ReactTestRenderer.create(
<Link page="https://www.facebook.com/">Facebook</Link>
);
console.log(renderer.toJSON());
// { type: 'a',
// props: { href: 'https://www.facebook.com/' },
// children: [ 'Facebook' ] }
You can also use Jest's snapshot testing feature to automatically save a copy of the JSON tree to a file and check in your tests that it hasn't changed: https://facebook.github.io/jest/blog/2016/07/27/jest-14.html.