December 2018
Intermediate to advanced
642 pages
15h 5m
English
Content preview from Modern JavaScript Web Development Cookbook
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Regenerating snapshots
What happens if a component has changed? Just for the sake of it, I made a pretty small change to a component. Upon running the tests, I got a FAIL message, with a comparison, that was produced by the usual diff command:
FAIL src/regionsApp/countryAndRegions.test.js ● App for Regions and Countries › renders correctly expect(value).toMatchSnapshot() Received value does not match stored snapshot 1. - Snapshot + Received @@ -7,11 +7,11 @@ loading={true} onSelect={[Function]} /> </div> <div> - Display: + Displays: <RegionsTable list={Array []} /> </div> </div> at Object.it (src/regionsApp/countryAndRegions.test.js:31:22) at new Promise (<anonymous>) at Promise.resolve.then.el (node_modules/p-map/index.js:46:16)Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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.