Web Reference: See React: Function and Class Components. Reminders that with Class components, we expect Jest to be used to test props and not methods directly. Now let's use React's test renderer and Jest's snapshot feature to interact with the component and capture the rendered output and create a snapshot file: Oct 9, 2019 · A complex app often uses react-router, redux, React's Context, third-party libraries (react-select for example). Kent C. Dodds has a complete course on that (and much more) called Testing JavaScript that I really recommend! Create React App uses Jest as its test runner. To prepare for this integration, we did a major revamp of Jest so if you heard bad things about it years ago, give it another try. Jest is a Node-based runner. This means that the tests always run in a Node environment and not in a real browser.
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