img-lazy.spec.js
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import { mount } from '@vue/test-utils'
import { waitNT, waitRAF } from '../../../tests/utils'
import { BImgLazy } from './img-lazy'
const src = 'https://picsum.photos/1024/400/?image=41'
describe('img-lazy', () => {
it('has root element "img"', async () => {
const wrapper = mount(BImgLazy, {
attachTo: document.body,
propsData: {
src
}
})
expect(wrapper.element.tagName).toBe('IMG')
wrapper.destroy()
})
it('is initially shown show prop is set', async () => {
const wrapper = mount(BImgLazy, {
attachTo: document.body,
propsData: {
src,
show: true
}
})
expect(wrapper.element.tagName).toBe('IMG')
expect(wrapper.attributes('src')).toBeDefined()
expect(wrapper.attributes('src')).toBe(src)
wrapper.destroy()
})
it('shows when IntersectionObserver not supported', async () => {
const wrapper = mount(BImgLazy, {
attachTo: document.body,
propsData: {
src,
show: false
}
})
expect(wrapper.element.tagName).toBe('IMG')
await waitNT(wrapper.vm)
await waitRAF()
await waitNT(wrapper.vm)
await waitRAF()
await waitNT(wrapper.vm)
await waitRAF()
expect(wrapper.vm.isShown).toBe(true)
// It appears that vue-test-utils does not run unbind when the directive is
// removed from the element. Only when the component is destroyed... unlike Vue
// Our directive instance should not exist
// let observer = wrapper.element.__bv__visibility_observer
// expect(observer).toBeUndefined()
expect(wrapper.attributes('src')).toBeDefined()
expect(wrapper.attributes('src')).toContain(src)
await wrapper.setProps({
show: true
})
await waitNT(wrapper.vm)
await waitRAF()
await waitNT(wrapper.vm)
await waitRAF()
expect(wrapper.attributes('src')).toBe(src)
expect(wrapper.vm.isShown).toBe(true)
// Our directive instance should not exist
// observer = wrapper.element.__bv__visibility_observer
// expect(observer).toBeUndefined()
await wrapper.setProps({
show: false
})
await waitNT(wrapper.vm)
await waitRAF()
await waitNT(wrapper.vm)
await waitRAF()
expect(wrapper.attributes('src')).toContain(src)
// Our directive instance should not exist
// observer = wrapper.element.__bv__visibility_observer
// expect(observer).toBeUndefined()
wrapper.destroy()
})
})