tailwindcss/tests/dark-mode.test.js

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

crosscheck(() => {
  it('should be possible to use the darkMode "class" mode', () => {
    let config = {
      darkMode: 'class',
      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}
        :is(.dark .dark\:font-bold) {
          font-weight: 700;
        }
      `)
    })
  })

  it('should be possible to change the class name', () => {
    let config = {
      darkMode: ['class', '.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}
        :is(.test-dark .dark\:font-bold) {
          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;
          }
        }
      `)
    })
  })
})