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Add snapshot tests for SVG and JSON (#1557)

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These tests should fail if something is accidentally changed that affects the SVG or JSON files. In the case of deliberate changes, we can update the snapshots.
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Paul Melnikow
2018-03-11 09:07:03 -07:00
committed by GitHub
parent d5fc786ad3
commit ae848f38f4
6 changed files with 247 additions and 33 deletions
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README.md
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@@ -132,7 +132,14 @@ badge preview URIs with `maxAge` – run `LONG_CACHE=true npm run build`.
To analyze the frontend bundle, run `npm install webpack-bundle-analyzer` and
then `ANALYZE=true npm start`.
[Snapshot tests][] ensure we don't inadvertently make changes that affect the
SVG or JSON output. When deliberately changing the output, run
`SNAPSHOT_DRY=1 npm run test:js:server` to preview changes to the saved
snapshots, and `SNAPSHOT_UPDATE=1 npm run test:js:server` to update them.
[package manager]: https://nodejs.org/en/download/package-manager/
[snapshot tests]: https://glebbahmutov.com/blog/snapshot-testing/
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