element-plus/packages/components/popper/__tests__/arrow.spec.ts

import { ref, nextTick } from 'vue'
import { shallowMount } from '@vue/test-utils'
import ElArrow from '../src/arrow.vue'
import { POPPER_CONTENT_INJECTION_KEY } from '../src/tokens'

const popperContentInjection = {
  arrowRef: ref(null),
  arrowOffset: ref(0),
}

const mountArrow = () =>
  shallowMount(ElArrow, {
    global: {
      provide: {
        [POPPER_CONTENT_INJECTION_KEY as symbol]: popperContentInjection,
      },
    },
  })

describe('<ElPopperArrow />', () => {
  let wrapper

  beforeEach(() => {
    wrapper = mountArrow()
    return nextTick()
  })

  afterEach(() => {
    wrapper?.unmount()
    popperContentInjection.arrowRef.value = null
    popperContentInjection.arrowOffset.value = 0
  })

  it('should set the arrowRef after mounted', async () => {
    expect(popperContentInjection.arrowRef.value).toBe(wrapper.vm.arrowRef)
    expect(popperContentInjection.arrowOffset.value).toBe(0)
  })

  it('should update the offset after props changed', async () => {
    expect(popperContentInjection.arrowOffset.value).toBe(0)

    await wrapper.setProps({
      arrowOffset: 10,
    })

    expect(popperContentInjection.arrowOffset.value).toBe(10)
  })

  it('should unset arrowRef before unmount', async () => {
    expect(popperContentInjection.arrowRef.value).toBe(wrapper.vm.arrowRef)

    wrapper.unmount()
    expect(popperContentInjection.arrowRef.value).toBeNull()
  })
})