tailwindcss/tests/dark-mode.test.js

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

it('should be possible to use the darkMode "selector" mode', () => {
  let config = {
    darkMode: 'selector',
    content: [{ raw: html`<div class="dark:font-bold"></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}
      .dark\:font-bold:where(.dark, .dark *) {
        font-weight: 700;
      }
    `)
  })
})

it('should be possible to change the selector', () => {
  let config = {
    darkMode: ['selector', '.test-dark'],
    content: [{ raw: html`<div class="dark:font-bold"></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}
      .dark\:font-bold:where(.test-dark, .test-dark *) {
        font-weight: 700;
      }
    `)
  })
})

it('should be possible to use the darkMode "media" mode', () => {
  let config = {
    darkMode: 'media',
    content: [{ raw: html`<div class="dark:font-bold"></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-color-scheme: dark) {
        .dark\:font-bold {
          font-weight: 700;
        }
      }
    `)
  })
})

it('should default to the `media` mode when no mode is provided', () => {
  let config = {
    content: [{ raw: html`<div class="dark:font-bold"></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-color-scheme: dark) {
        .dark\:font-bold {
          font-weight: 700;
        }
      }
    `)
  })
})

it('should default to the `media` mode when mode is set to `false`', () => {
  let config = {
    darkMode: false,
    content: [{ raw: html`<div class="dark:font-bold"></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-color-scheme: dark) {
        .dark\:font-bold {
          font-weight: 700;
        }
      }
    `)
  })
})

it('should support the deprecated `class` dark mode behavior', () => {
  let config = {
    darkMode: 'class',
    content: [{ raw: html`<div class="dark:font-bold"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      :is(.dark .dark\:font-bold) {
        font-weight: 700;
      }
    `)
  })
})

it('should support custom classes with  deprecated `class` dark mode', () => {
  let config = {
    darkMode: ['class', '.my-dark'],
    content: [{ raw: html`<div class="dark:font-bold"></div>` }],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      :is(.my-dark .dark\:font-bold) {
        font-weight: 700;
      }
    `)
  })
})

it('should use legacy sorting when using `darkMode: class`', () => {
  let config = {
    darkMode: 'class',
    content: [
      {
        raw: html`<div class="dark:text-green-100  hover:text-green-200 lg:text-green-300"></div>`,
      },
    ],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .hover\:text-green-200:hover {
        --tw-text-opacity: 1;
        color: rgb(187 247 208 / var(--tw-text-opacity));
      }
      :is(.dark .dark\:text-green-100) {
        --tw-text-opacity: 1;
        color: rgb(220 252 231 / var(--tw-text-opacity));
      }
      @media (min-width: 1024px) {
        .lg\:text-green-300 {
          --tw-text-opacity: 1;
          color: rgb(134 239 172 / var(--tw-text-opacity));
        }
      }
    `)
  })
})

it('should use modern sorting otherwise', () => {
  let config = {
    darkMode: 'selector',
    content: [
      {
        raw: html`<div class="dark:text-green-100  hover:text-green-200 lg:text-green-300"></div>`,
      },
    ],
    corePlugins: { preflight: false },
  }

  let input = css`
    @tailwind utilities;
  `

  return run(input, config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .hover\:text-green-200:hover {
        --tw-text-opacity: 1;
        color: rgb(187 247 208 / var(--tw-text-opacity));
      }
      @media (min-width: 1024px) {
        .lg\:text-green-300 {
          --tw-text-opacity: 1;
          color: rgb(134 239 172 / var(--tw-text-opacity));
        }
      }
      .dark\:text-green-100:where(.dark, .dark *) {
        --tw-text-opacity: 1;
        color: rgb(220 252 231 / var(--tw-text-opacity));
      }
    `)
  })
})