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5da7a6f923
Adds the ability to ''locally'' run visual regression testing for wp-admin pages via `npm run test:visual`. Snapshots are stored on contributors' local machines. Note: Wiring to the CI is not included. Why? The challenges for the CI are storage of the artifacts and unreliability of testing these across different environments. This commit is a first step towards visual regression testing. Running it locally provides a learning opportunity which could help to craft how to build it into the automated CI process. Props isabel_brison, andraganescu, azaozz, danfarrow, desrosj, hellofromTonya, justinahinon, netweb, talldanwp. Fixes #49606. git-svn-id: https://develop.svn.wordpress.org/trunk@51989 602fd350-edb4-49c9-b593-d223f7449a82
12 lines
585 B
Markdown
12 lines
585 B
Markdown
# Visual Regression Tests in WordPress Core
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These tests make use of Jest and Puppeteer, with a setup very similar to that of the e2e tests, together with [jest-image-snapshot](https://github.com/americanexpress/jest-image-snapshot) for generating the visual diffs.
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## How to Run the Tests Locally
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1. Check out trunk.
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2. Run `npm run test:visual` to generate some base snapshots.
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3. Check out the feature branch to be tested.
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4. Run `npm run test:visual` again. If any tests fail, the diff images can be found in `tests/visual-regression/specs/__image_snapshots__/__diff_output__`.
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