tailwindcss/tests/prefers-contrast.test.js

import { run, html, css, defaults } from './util/run'

it('should be possible to use contrast-more and contrast-less variants', () => {
  let config = {
    content: [
      {
        raw: html`<div class="bg-white contrast-more:bg-pink-500 contrast-less:bg-black"></div>`,
      },
    ],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind base;
    @tailwind components;
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      ${defaults}
      .bg-white {
        --tw-bg-opacity: 1;
        background-color: rgb(255 255 255 / var(--tw-bg-opacity));
      }
      @media (prefers-contrast: more) {
        .contrast-more\:bg-pink-500 {
          --tw-bg-opacity: 1;
          background-color: rgb(236 72 153 / var(--tw-bg-opacity));
        }
      }
      @media (prefers-contrast: less) {
        .contrast-less\:bg-black {
          --tw-bg-opacity: 1;
          background-color: rgb(0 0 0 / var(--tw-bg-opacity));
        }
      }
    `)
  })
})

it('dark mode should appear after the contrast variants', () => {
  let config = {
    content: [{ raw: html`<div class="contrast-more:bg-black dark:bg-white"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind base;
    @tailwind components;
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      ${defaults}
      @media (prefers-contrast: more) {
        .contrast-more\:bg-black {
          --tw-bg-opacity: 1;
          background-color: rgb(0 0 0 / var(--tw-bg-opacity));
        }
      }
      @media (prefers-color-scheme: dark) {
        .dark\:bg-white {
          --tw-bg-opacity: 1;
          background-color: rgb(255 255 255 / var(--tw-bg-opacity));
        }
      }
    `)
  })
})