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frontend/test_support/dom.js

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const jsdom = require('jsdom')

const { JSDOM } = jsdom
const dom = new JSDOM('<!doctype html><html><body></body></html>')

global.document = dom.window.document
global.window = dom.window

// take all properties of the window object and also attach it to the
// mocha global object
propagateToGlobal(dom.window)

// from mocha-jsdom https://github.com/rstacruz/mocha-jsdom/blob/master/index.js#L80
function propagateToGlobal(window) {
  global.HTMLElement = window.HTMLElement
  Object.keys(window).forEach(key => {
    if (key in global) return
    global[key] = window[key]
  })
}

// Metamaps dependencies fixes
global.HowlerGlobal = global.HowlerGlobal || { prototype: {} }
global.Howl = global.Howl || { prototype: {} }
global.Sound = global.Sound || { prototype: {} }