import { mount } from '@vue/test-utils'
import BackTop from '..'

describe('BackTop', () => {
  it('should scroll to top after click it', async () => {
    const wrapper = mount(BackTop, {
      propsData: {
        visibilityHeight: -1,
      },
    })
    document.documentElement.scrollTop = 400
    // trigger scroll manually
    wrapper.vm.handleScroll()
    await new Promise(resolve => setTimeout(resolve, 0))
    wrapper.find('.ant-back-top').trigger('click')
    await new Promise(resolve => setTimeout(resolve, 1000))
    expect(Math.abs(Math.round(document.documentElement.scrollTop))).toBe(0)
  })
})