element-plus/packages/components/icon/__tests__/icon.spec.ts

import { mount } from '@vue/test-utils'
import Icon from '../src/index.vue'

describe('Icon.vue', () => {
  test('render', () => {
    const wrapper = mount(Icon, {
      props: {
        color: '#000000',
        size: 18,
      },
    })
    expect(wrapper.element.getAttribute('style')).toContain(
      `--color: #000000`,
    )
    expect(wrapper.element.getAttribute('style')).toContain(
      `--font-size: 18px`,
    )
  })
})