video-ad-sdk/src/adUnit/helpers/metrics/handlers/__tests__/onVolumeChange.spec.ts

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

import {linearEvents} from '../../../../../tracker'
import {volumeChanged} from '../../../../adUnitEvents'
import {onVolumeChange} from '../onVolumeChange'

const {mute, unmute} = linearEvents

test('onVolumechange must call the callback with mute if the video was unmute and it became mute and the other way around', () => {
  const callback = jest.fn()
  const videoElement = document.createElement('video')

  videoElement.muted = false

  const disconnect = onVolumeChange({videoElement} as any, callback)

  videoElement.muted = true

  expect(callback).toHaveBeenCalledTimes(2)
  expect(callback).toHaveBeenCalledWith(volumeChanged)
  expect(callback).toHaveBeenCalledWith(mute)

  callback.mockClear()
  videoElement.muted = false

  expect(callback).toHaveBeenCalledTimes(2)
  expect(callback).toHaveBeenCalledWith(volumeChanged)
  expect(callback).toHaveBeenCalledWith(unmute)

  callback.mockClear()
  videoElement.volume = 0.6
  expect(callback).toHaveBeenCalledTimes(1)
  expect(callback).toHaveBeenCalledWith(volumeChanged)

  callback.mockClear()
  videoElement.volume = 0
  videoElement.muted = false

  expect(callback).toHaveBeenCalledTimes(2)
  expect(callback).toHaveBeenCalledWith(volumeChanged)
  expect(callback).toHaveBeenCalledWith(mute)

  callback.mockClear()
  videoElement.muted = false
  videoElement.volume = 0.5

  expect(callback).toHaveBeenCalledTimes(2)
  expect(callback).toHaveBeenCalledWith(volumeChanged)
  expect(callback).toHaveBeenCalledWith(unmute)

  disconnect()
  callback.mockClear()
  videoElement.muted = true
  videoElement.volume = 0
  videoElement.dispatchEvent(new Event('volumechange'))
  expect(callback).toHaveBeenCalledTimes(0)
})