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Jest matcher to assert that a string of CSS matches another one

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CSS Matcher for Jest

npm install jest-matcher-css

In your Jest config:

"jest": {
  "setupTestFrameworkScriptFile": "./setup.js"
}

In setup.js:

const cssMatcher = require('jest-matcher-css');

expect.extend({
  toMatchCss: cssMatcher,
});

Written by Adam Wathan for Tailwind CSS. I moved it into its own module to use it in a couple of Tailwind plugins.