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README.md

Visual Regression Tests in WordPress Core

These tests make use of Jest and Puppeteer, with a setup very similar to that of the e2e tests, together with jest-image-snapshot for generating the visual diffs.

How to Run the Tests Locally

  1. Check out trunk.
  2. Run npm run test:visual to generate some base snapshots.
  3. Check out the feature branch to be tested.
  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__.