video-ad-sdk/src/adContainer/helpers/__tests__/createIframe.spec.ts

VAST/VPAID SDK that allows video ads to be played on top of any player

import {createIframe} from '../createIframe'
import {supportsSrcdoc} from '../supportsSrcdoc'

jest.mock('../supportsSrcdoc')
describe('createIframe', () => {
  beforeEach(() => {
    ;(supportsSrcdoc as jest.Mock).mockReturnValue(false)
  })

  test('must return an empty Iframe element', async () => {
    const iframe = await createIframe(document.body, 'test')

    expect(iframe).toBeInstanceOf(HTMLIFrameElement)
    expect(iframe).toMatchSnapshot()

    iframe.parentElement?.removeChild(iframe)
  })

  test('must post a message to notify that is ready', async () => {
    expect.assertions(1)

    const handleMessage = ({data}: MessageEvent): void => {
      expect(data).toBe('test_iframe_ready')
    }

    window.addEventListener('message', handleMessage, false)
    await createIframe(document.body, 'test_iframe')
  })

  test('must throw (reject) if there is a problem creating the iframe', async () => {
    expect.assertions(1)

    try {
      await createIframe(document.createElement('div'), 'test')
    } catch (error) {
      expect(error).toBeInstanceOf(Error)
    }
  })
})