tailwindcss/tests/getClassList.test.js

import resolveConfig from '../src/public/resolve-config'
import { createContext } from '../src/lib/setupContextUtils'

it('should generate every possible class, without variants', () => {
  let config = {}

  let context = createContext(resolveConfig(config))
  let classes = context.getClassList()
  expect(classes).toBeInstanceOf(Array)

  // Verify we have a `container` for the 'components' section.
  expect(classes).toContain('container')

  // Verify we handle the DEFAULT case correctly
  expect(classes).toContain('border')

  // Verify we handle negative values correctly
  expect(classes).toContain('-inset-1/4')
  expect(classes).toContain('-m-0')
  expect(classes).not.toContain('-uppercase')
  expect(classes).not.toContain('-opacity-50')

  config = { theme: { extend: { margin: { DEFAULT: '5px' } } } }
  context = createContext(resolveConfig(config))
  classes = context.getClassList()

  expect(classes).not.toContain('-m-DEFAULT')
})

it('should generate every possible class while handling negatives and prefixes', () => {
  let config = { prefix: 'tw-' }
  let context = createContext(resolveConfig(config))
  let classes = context.getClassList()
  expect(classes).toBeInstanceOf(Array)

  // Verify we have a `container` for the 'components' section.
  expect(classes).toContain('tw-container')

  // Verify we handle the DEFAULT case correctly
  expect(classes).toContain('tw-border')

  // Verify we handle negative values correctly
  expect(classes).toContain('-tw-inset-1/4')
  expect(classes).toContain('-tw-m-0')
  expect(classes).not.toContain('-tw-uppercase')
  expect(classes).not.toContain('-tw-opacity-50')

  // These utilities do work but there's no reason to generate
  // them alongside the `-{prefix}-{utility}` versions
  expect(classes).not.toContain('tw--inset-1/4')
  expect(classes).not.toContain('tw--m-0')

  config = {
    prefix: 'tw-',
    theme: { extend: { margin: { DEFAULT: '5px' } } },
  }
  context = createContext(resolveConfig(config))
  classes = context.getClassList()

  expect(classes).not.toContain('-tw-m-DEFAULT')
})

it('should not generate utilities with opacity by default', () => {
  let config = {}
  let context = createContext(resolveConfig(config))
  let classes = context.getClassList()

  expect(classes).not.toContain('bg-red-500/50')
})

it('should not generate utilities with opacity even if safe-listed', () => {
  let config = {
    safelist: [
      {
        pattern: /^bg-red-(400|500)(\/(40|50))?$/,
      },
    ],
  }

  let context = createContext(resolveConfig(config))
  let classes = context.getClassList()

  expect(classes).not.toContain('bg-red-500/50')
})