tailwindcss/__tests__/containerPlugin.test.js

import _ from 'lodash'
import postcss from 'postcss'
import processPlugins from '../src/util/processPlugins'
import container from '../src/plugins/container'

function css(nodes) {
  return postcss.root({ nodes }).toString()
}

function processPluginsWithValidConfig(config) {
  return processPlugins(
    _.defaultsDeep(config, {
      screens: {
        sm: '576px',
        md: '768px',
        lg: '992px',
        xl: '1200px',
      },
      options: {
        prefix: '',
        important: false,
        separator: ':',
      },
    })
  )
}

test('options are not required', () => {
  const { components } = processPluginsWithValidConfig({
    plugins: [container()],
  })

  expect(css(components)).toMatchCss(`
    .container { width: 100% }
    @media (min-width: 576px) {
      .container { max-width: 576px }
    }
    @media (min-width: 768px) {
      .container { max-width: 768px }
    }
    @media (min-width: 992px) {
      .container { max-width: 992px }
    }
    @media (min-width: 1200px) {
      .container { max-width: 1200px }
    }
  `)
})

test('screens can be specified explicitly', () => {
  const { components } = processPluginsWithValidConfig({
    plugins: [
      container({
        screens: {
          sm: '400px',
          lg: '500px',
        },
      }),
    ],
  })

  expect(css(components)).toMatchCss(`
    .container { width: 100% }
    @media (min-width: 400px) {
      .container { max-width: 400px }
    }
    @media (min-width: 500px) {
      .container { max-width: 500px }
    }
  `)
})

test('screens can be an array', () => {
  const { components } = processPluginsWithValidConfig({
    plugins: [
      container({
        screens: ['400px', '500px'],
      }),
    ],
  })

  expect(css(components)).toMatchCss(`
    .container { width: 100% }
    @media (min-width: 400px) {
      .container { max-width: 400px }
    }
    @media (min-width: 500px) {
      .container { max-width: 500px }
    }
  `)
})

test('the container can be centered by default', () => {
  const { components } = processPluginsWithValidConfig({
    plugins: [
      container({
        center: true,
      }),
    ],
  })

  expect(css(components)).toMatchCss(`
    .container {
      width: 100%;
      margin-right: auto;
      margin-left: auto
    }
    @media (min-width: 576px) {
      .container { max-width: 576px }
    }
    @media (min-width: 768px) {
      .container { max-width: 768px }
    }
    @media (min-width: 992px) {
      .container { max-width: 992px }
    }
    @media (min-width: 1200px) {
      .container { max-width: 1200px }
    }
  `)
})

test('horizontal padding can be included by default', () => {
  const { components } = processPluginsWithValidConfig({
    plugins: [
      container({
        padding: '2rem',
      }),
    ],
  })

  expect(css(components)).toMatchCss(`
    .container {
      width: 100%;
      padding-right: 2rem;
      padding-left: 2rem
    }
    @media (min-width: 576px) {
      .container { max-width: 576px }
    }
    @media (min-width: 768px) {
      .container { max-width: 768px }
    }
    @media (min-width: 992px) {
      .container { max-width: 992px }
    }
    @media (min-width: 1200px) {
      .container { max-width: 1200px }
    }
  `)
})

test('setting all options at once', () => {
  const { components } = processPluginsWithValidConfig({
    plugins: [
      container({
        screens: {
          sm: '400px',
          lg: '500px',
        },
        center: true,
        padding: '2rem',
      }),
    ],
  })

  expect(css(components)).toMatchCss(`
    .container {
      width: 100%;
      margin-right: auto;
      margin-left: auto;
      padding-right: 2rem;
      padding-left: 2rem
    }
    @media (min-width: 400px) {
      .container { max-width: 400px }
    }
    @media (min-width: 500px) {
      .container { max-width: 500px }
    }
  `)
})