core/packages/runtime-dom/__tests__/modules/style.spec.ts

import { patchStyle } from '../../src/modules/style'

describe(`module style`, () => {
  it('string', () => {
    const el = document.createElement('div')
    patchStyle(el, {}, 'color:red')
    expect(el.style.cssText.replace(/\s/g, '')).toBe('color:red;')
  })

  it('plain object', () => {
    const el = document.createElement('div')
    patchStyle(el, {}, { color: 'red' })
    expect(el.style.cssText.replace(/\s/g, '')).toBe('color:red;')
  })

  it('camelCase', () => {
    const el = document.createElement('div')
    patchStyle(el, {}, { marginRight: '10px' })
    expect(el.style.cssText.replace(/\s/g, '')).toBe('margin-right:10px;')
  })

  it('remove if falsy value', () => {
    const el = document.createElement('div')
    patchStyle(el, { color: 'red' }, { color: null })
    expect(el.style.cssText.replace(/\s/g, '')).toBe('')
  })

  it('!important', () => {
    const el = document.createElement('div')
    patchStyle(el, {}, { color: 'red !important' })
    expect(el.style.cssText.replace(/\s/g, '')).toBe('color:red!important;')
  })

  it('camelCase with !important', () => {
    const el = document.createElement('div')
    patchStyle(el, {}, { marginRight: '10px !important' })
    expect(el.style.cssText.replace(/\s/g, '')).toBe(
      'margin-right:10px!important;'
    )
  })

  it('object with multiple entries', () => {
    const el = document.createElement('div')
    patchStyle(el, {}, { color: 'red', marginRight: '10px' })
    expect(el.style.getPropertyValue('color')).toBe('red')
    expect(el.style.getPropertyValue('margin-right')).toBe('10px')
  })
})