video-ad-sdk/src/adUnit/helpers/vpaid/__tests__/viewmode.spec.ts

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

import {viewmode} from '../viewmode'

describe('viewmode', () => {
  let origScreen: Screen

  beforeEach(() => {
    origScreen = window.screen

    Object.defineProperty(window, 'screen', {
      value: {
        height: 800,
        width: 1200
      },
      writable: true
    })
  })

  afterEach(() => {
    Object.defineProperty(window, 'screen', {
      value: origScreen,
      writable: true
    })
  })

  test('must return `fullscreen` if the width and the height are about the viewport size', () => {
    expect(viewmode(window.screen.width, window.screen.height)).toBe(
      'fullscreen'
    )
  })

  test('must return `thumbnail` if the width is smaller than 400', () => {
    expect(viewmode(300, 200)).toBe('thumbnail')
  })

  test('must return `normal` if width is bigger 400 and not in fullscreen', () => {
    expect(viewmode(640, 328)).toBe('normal')
  })
})