tailwindcss/tests/parallel-variants.test.js

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

test('basic parallel variants', async () => {
  let config = {
    content: [
      {
        raw: html`<div
          class="hover:test:font-black test:font-bold test:font-medium font-normal"
        ></div>`,
      },
    ],
    plugins: [
      function test({ addVariant }) {
        addVariant('test', ['& *::test', '&::test'])
      },
    ],
  }

  return run('@tailwind utilities', config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .font-normal {
        font-weight: 400;
      }
      .test\:font-bold ::test {
        font-weight: 700;
      }
      .test\:font-medium ::test {
        font-weight: 500;
      }
      .hover\:test\:font-black ::test:hover {
        font-weight: 900;
      }
      .test\:font-bold::test {
        font-weight: 700;
      }
      .test\:font-medium::test {
        font-weight: 500;
      }
      .hover\:test\:font-black::test:hover {
        font-weight: 900;
      }
    `)
  })
})

test('parallel variants can be generated using a function that returns parallel variants', async () => {
  let config = {
    content: [
      {
        raw: html`<div
          class="hover:test:font-black test:font-bold test:font-medium font-normal"
        ></div>`,
      },
    ],
    plugins: [
      function test({ addVariant }) {
        addVariant('test', () => ['& *::test', '&::test'])
      },
    ],
  }

  return run('@tailwind utilities', config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .font-normal {
        font-weight: 400;
      }
      .test\:font-bold ::test {
        font-weight: 700;
      }
      .test\:font-medium ::test {
        font-weight: 500;
      }
      .test\:font-bold::test {
        font-weight: 700;
      }
      .test\:font-medium::test {
        font-weight: 500;
      }
      .hover\:test\:font-black ::test:hover {
        font-weight: 900;
      }
      .hover\:test\:font-black::test:hover {
        font-weight: 900;
      }
    `)
  })
})

test('a function that returns parallel variants can modify the container', async () => {
  let config = {
    content: [
      {
        raw: html`<div
          class="hover:test:font-black test:font-bold test:font-medium font-normal"
        ></div>`,
      },
    ],
    plugins: [
      function test({ addVariant }) {
        addVariant('test', ({ container }) => {
          container.walkDecls((decl) => {
            decl.value = `calc(0 + ${decl.value})`
          })

          return ['& *::test', '&::test']
        })
      },
    ],
  }

  return run('@tailwind utilities', config).then((result) => {
    expect(result.css).toMatchFormattedCss(css`
      .font-normal {
        font-weight: 400;
      }
      .test\:font-bold ::test {
        font-weight: 700;
      }
      .test\:font-medium ::test {
        font-weight: 500;
      }
      .test\:font-bold::test {
        font-weight: 700;
      }
      .test\:font-medium::test {
        font-weight: 500;
      }
      .hover\:test\:font-black ::test:hover {
        font-weight: 900;
      }
      .hover\:test\:font-black::test:hover {
        font-weight: 900;
      }
    `)
  })
})