electron/spec/webview-spec.js

const { expect } = require('chai')
const path = require('path')
const http = require('http')
const url = require('url')
const { ipcRenderer } = require('electron')
const { emittedOnce, waitForEvent } = require('./events-helpers')

const features = process.electronBinding('features')
const nativeModulesEnabled = process.env.ELECTRON_SKIP_NATIVE_MODULE_TESTS

/* Most of the APIs here don't use standard callbacks */
/* eslint-disable standard/no-callback-literal */

describe('<webview> tag', function () {
  this.timeout(3 * 60 * 1000)

  const fixtures = path.join(__dirname, 'fixtures')
  let webview = null

  const loadWebView = async (webview, attributes = {}) => {
    for (const [name, value] of Object.entries(attributes)) {
      webview.setAttribute(name, value)
    }
    document.body.appendChild(webview)
    await waitForEvent(webview, 'did-finish-load')
    return webview
  }

  const startLoadingWebViewAndWaitForMessage = async (webview, attributes = {}) => {
    loadWebView(webview, attributes) // Don't wait for load to be finished.
    const event = await waitForEvent(webview, 'console-message')
    return event.message
  }

  beforeEach(() => {
    webview = new WebView()
  })

  afterEach(() => {
    if (!document.body.contains(webview)) {
      document.body.appendChild(webview)
    }
    webview.remove()
  })

  describe('src attribute', () => {
    it('specifies the page to load', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        src: `file://${fixtures}/pages/a.html`
      })
      expect(message).to.equal('a')
    })

    it('navigates to new page when changed', async () => {
      await loadWebView(webview, {
        src: `file://${fixtures}/pages/a.html`
      })

      webview.src = `file://${fixtures}/pages/b.html`

      const { message } = await waitForEvent(webview, 'console-message')
      expect(message).to.equal('b')
    })

    it('resolves relative URLs', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        src: '../fixtures/pages/e.html'
      })
      expect(message).to.equal('Window script is loaded before preload script')
    })

    it('ignores empty values', () => {
      expect(webview.src).to.equal('')

      for (const emptyValue of ['', null, undefined]) {
        webview.src = emptyValue
        expect(webview.src).to.equal('')
      }
    })

    it('does not wait until loadURL is resolved', async () => {
      await loadWebView(webview, { src: 'about:blank' })

      const before = Date.now()
      webview.src = 'https://github.com'
      const now = Date.now()

      // Setting src is essentially sending a sync IPC message, which should
      // not exceed more than a few ms.
      //
      // This is for testing #18638.
      expect(now - before).to.be.below(100)
    })
  })

  describe('nodeintegration attribute', () => {
    it('inserts no node symbols when not set', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        src: `file://${fixtures}/pages/c.html`
      })

      const types = JSON.parse(message)
      expect(types).to.include({
        require: 'undefined',
        module: 'undefined',
        process: 'undefined',
        global: 'undefined'
      })
    })

    it('inserts node symbols when set', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        nodeintegration: 'on',
        src: `file://${fixtures}/pages/d.html`
      })

      const types = JSON.parse(message)
      expect(types).to.include({
        require: 'function',
        module: 'object',
        process: 'object'
      })
    })

    it('loads node symbols after POST navigation when set', async function () {
      // FIXME Figure out why this is timing out on AppVeyor
      if (process.env.APPVEYOR === 'True') {
        this.skip()
        return
      }

      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        nodeintegration: 'on',
        src: `file://${fixtures}/pages/post.html`
      })

      const types = JSON.parse(message)
      expect(types).to.include({
        require: 'function',
        module: 'object',
        process: 'object'
      })
    })

    it('disables node integration on child windows when it is disabled on the webview', async () => {
      const src = url.format({
        pathname: `${fixtures}/pages/webview-opener-no-node-integration.html`,
        protocol: 'file',
        query: {
          p: `${fixtures}/pages/window-opener-node.html`
        },
        slashes: true
      })
      loadWebView(webview, {
        allowpopups: 'on',
        src
      })
      const { message } = await waitForEvent(webview, 'console-message')
      expect(JSON.parse(message).isProcessGlobalUndefined).to.be.true()
    });

    (nativeModulesEnabled ? it : it.skip)('loads native modules when navigation happens', async function () {
      await loadWebView(webview, {
        nodeintegration: 'on',
        src: `file://${fixtures}/pages/native-module.html`
      })

      webview.reload()

      const { message } = await waitForEvent(webview, 'console-message')
      expect(message).to.equal('function')
    })
  })

  describe('preload attribute', () => {
    it('loads the script before other scripts in window', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        preload: `${fixtures}/module/preload.js`,
        src: `file://${fixtures}/pages/e.html`
      })

      expect(message).to.be.a('string')
      expect(message).to.be.not.equal('Window script is loaded before preload script')
    })

    it('preload script can still use "process" and "Buffer" when nodeintegration is off', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        preload: `${fixtures}/module/preload-node-off.js`,
        src: `file://${fixtures}/api/blank.html`
      })

      const types = JSON.parse(message)
      expect(types).to.include({
        process: 'object',
        Buffer: 'function'
      })
    })

    it('runs in the correct scope when sandboxed', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        preload: `${fixtures}/module/preload-context.js`,
        src: `file://${fixtures}/api/blank.html`,
        webpreferences: 'sandbox=yes'
      })

      const types = JSON.parse(message)
      expect(types).to.include({
        require: 'function', // arguments passed to it should be availale
        electron: 'undefined', // objects from the scope it is called from should not be available
        window: 'object', // the window object should be available
        localVar: 'undefined' // but local variables should not be exposed to the window
      })
    })

    it('preload script can require modules that still use "process" and "Buffer" when nodeintegration is off', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        preload: `${fixtures}/module/preload-node-off-wrapper.js`,
        src: `file://${fixtures}/api/blank.html`
      })

      const types = JSON.parse(message)
      expect(types).to.include({
        process: 'object',
        Buffer: 'function'
      })
    })

    it('receives ipc message in preload script', async () => {
      await loadWebView(webview, {
        preload: `${fixtures}/module/preload-ipc.js`,
        src: `file://${fixtures}/pages/e.html`
      })

      const message = 'boom!'
      webview.send('ping', message)

      const { channel, args } = await waitForEvent(webview, 'ipc-message')
      expect(channel).to.equal('pong')
      expect(args).to.deep.equal([message])
    })

    it('works without script tag in page', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        preload: `${fixtures}/module/preload.js`,
        src: `file://${fixtures}pages/base-page.html`
      })

      const types = JSON.parse(message)
      expect(types).to.include({
        require: 'function',
        module: 'object',
        process: 'object',
        Buffer: 'function'
      })
    })

    it('resolves relative URLs', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        preload: '../fixtures/module/preload.js',
        src: `file://${fixtures}/pages/e.html`
      })

      const types = JSON.parse(message)
      expect(types).to.include({
        require: 'function',
        module: 'object',
        process: 'object',
        Buffer: 'function'
      })
    })

    it('ignores empty values', () => {
      expect(webview.preload).to.equal('')

      for (const emptyValue of ['', null, undefined]) {
        webview.preload = emptyValue
        expect(webview.preload).to.equal('')
      }
    })
  })

  describe('httpreferrer attribute', () => {
    it('sets the referrer url', (done) => {
      const referrer = 'http://github.com/'
      const server = http.createServer((req, res) => {
        res.end()
        server.close()
        expect(req.headers.referer).to.equal(referrer)
        done()
      }).listen(0, '127.0.0.1', () => {
        const port = server.address().port
        loadWebView(webview, {
          httpreferrer: referrer,
          src: `http://127.0.0.1:${port}`
        })
      })
    })
  })

  describe('useragent attribute', () => {
    it('sets the user agent', async () => {
      const referrer = 'Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; AS; rv:11.0) like Gecko'
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        src: `file://${fixtures}/pages/useragent.html`,
        useragent: referrer
      })
      expect(message).to.equal(referrer)
    })
  })

  describe('disablewebsecurity attribute', () => {
    it('does not disable web security when not set', async () => {
      const jqueryPath = path.join(__dirname, '/static/jquery-2.0.3.min.js')
      const src = `<script src='file://${jqueryPath}'></script> <script>console.log('ok');</script>`
      const encoded = btoa(unescape(encodeURIComponent(src)))

      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        src: `data:text/html;base64,${encoded}`
      })
      expect(message).to.be.a('string')
      expect(message).to.contain('Not allowed to load local resource')
    })

    it('disables web security when set', async () => {
      const jqueryPath = path.join(__dirname, '/static/jquery-2.0.3.min.js')
      const src = `<script src='file://${jqueryPath}'></script> <script>console.log('ok');</script>`
      const encoded = btoa(unescape(encodeURIComponent(src)))

      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        disablewebsecurity: '',
        src: `data:text/html;base64,${encoded}`
      })
      expect(message).to.equal('ok')
    })

    it('does not break node integration', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        disablewebsecurity: '',
        nodeintegration: 'on',
        src: `file://${fixtures}/pages/d.html`
      })

      const types = JSON.parse(message)
      expect(types).to.include({
        require: 'function',
        module: 'object',
        process: 'object'
      })
    })

    it('does not break preload script', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        disablewebsecurity: '',
        preload: `${fixtures}/module/preload.js`,
        src: `file://${fixtures}/pages/e.html`
      })

      const types = JSON.parse(message)
      expect(types).to.include({
        require: 'function',
        module: 'object',
        process: 'object',
        Buffer: 'function'
      })
    })
  })

  describe('partition attribute', () => {
    it('inserts no node symbols when not set', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        partition: 'test1',
        src: `file://${fixtures}/pages/c.html`
      })

      const types = JSON.parse(message)
      expect(types).to.include({
        require: 'undefined',
        module: 'undefined',
        process: 'undefined',
        global: 'undefined'
      })
    })

    it('inserts node symbols when set', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        nodeintegration: 'on',
        partition: 'test2',
        src: `file://${fixtures}/pages/d.html`
      })

      const types = JSON.parse(message)
      expect(types).to.include({
        require: 'function',
        module: 'object',
        process: 'object'
      })
    })

    it('isolates storage for different id', async () => {
      window.localStorage.setItem('test', 'one')

      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        partition: 'test3',
        src: `file://${fixtures}/pages/partition/one.html`
      })

      const parsedMessage = JSON.parse(message)
      expect(parsedMessage).to.include({
        numberOfEntries: 0,
        testValue: null
      })
    })

    it('uses current session storage when no id is provided', async () => {
      const testValue = 'one'
      window.localStorage.setItem('test', testValue)

      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        src: `file://${fixtures}/pages/partition/one.html`
      })

      const parsedMessage = JSON.parse(message)
      expect(parsedMessage).to.include({
        numberOfEntries: 1,
        testValue
      })
    })
  })

  describe('allowpopups attribute', () => {
    const generateSpecs = (description, webpreferences = '') => {
      describe(description, () => {
        it('can not open new window when not set', async () => {
          const message = await startLoadingWebViewAndWaitForMessage(webview, {
            webpreferences,
            src: `file://${fixtures}/pages/window-open-hide.html`
          })
          expect(message).to.equal('null')
        })

        it('can open new window when set', async () => {
          const message = await startLoadingWebViewAndWaitForMessage(webview, {
            webpreferences,
            allowpopups: 'on',
            src: `file://${fixtures}/pages/window-open-hide.html`
          })
          expect(message).to.equal('window')
        })
      })
    }

    generateSpecs('without sandbox')
    generateSpecs('with sandbox', 'sandbox=yes')
    generateSpecs('with nativeWindowOpen', 'nativeWindowOpen=yes')
  })

  describe('webpreferences attribute', () => {
    it('can enable nodeintegration', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        src: `file://${fixtures}/pages/d.html`,
        webpreferences: 'nodeIntegration'
      })

      const types = JSON.parse(message)
      expect(types).to.include({
        require: 'function',
        module: 'object',
        process: 'object'
      })
    })

    it('can disable the remote module', async () => {
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        preload: `${fixtures}/module/preload-disable-remote.js`,
        src: `file://${fixtures}/api/blank.html`,
        webpreferences: 'enableRemoteModule=no'
      })

      const typeOfRemote = JSON.parse(message)
      expect(typeOfRemote).to.equal('undefined')
    })

    it('can disables web security and enable nodeintegration', async () => {
      const jqueryPath = path.join(__dirname, '/static/jquery-2.0.3.min.js')
      const src = `<script src='file://${jqueryPath}'></script> <script>console.log(typeof require);</script>`
      const encoded = btoa(unescape(encodeURIComponent(src)))

      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        src: `data:text/html;base64,${encoded}`,
        webpreferences: 'webSecurity=no, nodeIntegration=yes'
      })

      expect(message).to.equal('function')
    })
  })

  describe('new-window event', () => {
    it('emits when window.open is called', async () => {
      loadWebView(webview, {
        src: `file://${fixtures}/pages/window-open.html`
      })
      const { url, frameName } = await waitForEvent(webview, 'new-window')

      expect(url).to.equal('http://host/')
      expect(frameName).to.equal('host')
    })

    it('emits when link with target is called', async () => {
      loadWebView(webview, {
        src: `file://${fixtures}/pages/target-name.html`
      })
      const { url, frameName } = await waitForEvent(webview, 'new-window')

      expect(url).to.equal('http://host/')
      expect(frameName).to.equal('target')
    })
  })

  describe('ipc-message event', () => {
    it('emits when guest sends an ipc message to browser', async () => {
      loadWebView(webview, {
        nodeintegration: 'on',
        src: `file://${fixtures}/pages/ipc-message.html`
      })
      const { channel, args } = await waitForEvent(webview, 'ipc-message')

      expect(channel).to.equal('channel')
      expect(args).to.deep.equal(['arg1', 'arg2'])
    })
  })

  describe('page-title-set event', () => {
    it('emits when title is set', async () => {
      loadWebView(webview, {
        src: `file://${fixtures}/pages/a.html`
      })
      const { title, explicitSet } = await waitForEvent(webview, 'page-title-set')

      expect(title).to.equal('test')
      expect(explicitSet).to.be.true()
    })
  })

  describe('page-favicon-updated event', () => {
    it('emits when favicon urls are received', async () => {
      loadWebView(webview, {
        src: `file://${fixtures}/pages/a.html`
      })
      const { favicons } = await waitForEvent(webview, 'page-favicon-updated')

      expect(favicons).to.be.an('array').of.length(2)
      if (process.platform === 'win32') {
        expect(favicons[0]).to.match(/^file:\/\/\/[A-Z]:\/favicon.png$/i)
      } else {
        expect(favicons[0]).to.equal('file:///favicon.png')
      }
    })
  })

  describe('will-navigate event', () => {
    it('emits when a url that leads to oustide of the page is clicked', async () => {
      loadWebView(webview, {
        src: `file://${fixtures}/pages/webview-will-navigate.html`
      })
      const { url } = await waitForEvent(webview, 'will-navigate')

      expect(url).to.equal('http://host/')
    })
  })

  describe('did-navigate event', () => {
    let p = path.join(fixtures, 'pages', 'webview-will-navigate.html')
    p = p.replace(/\\/g, '/')
    const pageUrl = url.format({
      protocol: 'file',
      slashes: true,
      pathname: p
    })

    it('emits when a url that leads to outside of the page is clicked', async () => {
      loadWebView(webview, { src: pageUrl })
      const { url } = await waitForEvent(webview, 'did-navigate')

      expect(url).to.equal(pageUrl)
    })
  })

  describe('did-navigate-in-page event', () => {
    it('emits when an anchor link is clicked', async () => {
      let p = path.join(fixtures, 'pages', 'webview-did-navigate-in-page.html')
      p = p.replace(/\\/g, '/')
      const pageUrl = url.format({
        protocol: 'file',
        slashes: true,
        pathname: p
      })
      loadWebView(webview, { src: pageUrl })
      const event = await waitForEvent(webview, 'did-navigate-in-page')
      expect(event.url).to.equal(`${pageUrl}#test_content`)
    })

    it('emits when window.history.replaceState is called', async () => {
      loadWebView(webview, {
        src: `file://${fixtures}/pages/webview-did-navigate-in-page-with-history.html`
      })
      const { url } = await waitForEvent(webview, 'did-navigate-in-page')
      expect(url).to.equal('http://host/')
    })

    it('emits when window.location.hash is changed', async () => {
      let p = path.join(fixtures, 'pages', 'webview-did-navigate-in-page-with-hash.html')
      p = p.replace(/\\/g, '/')
      const pageUrl = url.format({
        protocol: 'file',
        slashes: true,
        pathname: p
      })
      loadWebView(webview, { src: pageUrl })
      const event = await waitForEvent(webview, 'did-navigate-in-page')
      expect(event.url).to.equal(`${pageUrl}#test`)
    })
  })

  describe('close event', () => {
    it('should fire when interior page calls window.close', async () => {
      loadWebView(webview, { src: `file://${fixtures}/pages/close.html` })
      await waitForEvent(webview, 'close')
    })
  })

  // FIXME(zcbenz): Disabled because of moving to OOPIF webview.
  xdescribe('setDevToolsWebContents() API', () => {
    it('sets webContents of webview as devtools', async () => {
      const webview2 = new WebView()
      loadWebView(webview2)

      // Setup an event handler for further usage.
      const waitForDomReady = waitForEvent(webview2, 'dom-ready')

      loadWebView(webview, { src: 'about:blank' })
      await waitForEvent(webview, 'dom-ready')
      webview.getWebContents().setDevToolsWebContents(webview2.getWebContents())
      webview.getWebContents().openDevTools()

      await waitForDomReady

      // Its WebContents should be a DevTools.
      const devtools = webview2.getWebContents()
      expect(devtools.getURL().startsWith('devtools://devtools')).to.be.true()

      const name = await devtools.executeJavaScript('InspectorFrontendHost.constructor.name')
      document.body.removeChild(webview2)

      expect(name).to.be.equal('InspectorFrontendHostImpl')
    })
  })

  describe('devtools-opened event', () => {
    it('should fire when webview.openDevTools() is called', async () => {
      loadWebView(webview, {
        src: `file://${fixtures}/pages/base-page.html`
      })
      await waitForEvent(webview, 'dom-ready')

      webview.openDevTools()
      await waitForEvent(webview, 'devtools-opened')

      webview.closeDevTools()
    })
  })

  describe('devtools-closed event', () => {
    it('should fire when webview.closeDevTools() is called', async () => {
      loadWebView(webview, {
        src: `file://${fixtures}/pages/base-page.html`
      })
      await waitForEvent(webview, 'dom-ready')

      webview.openDevTools()
      await waitForEvent(webview, 'devtools-opened')

      webview.closeDevTools()
      await waitForEvent(webview, 'devtools-closed')
    })
  })

  describe('devtools-focused event', () => {
    it('should fire when webview.openDevTools() is called', async () => {
      loadWebView(webview, {
        src: `file://${fixtures}/pages/base-page.html`
      })

      const waitForDevToolsFocused = waitForEvent(webview, 'devtools-focused')

      await waitForEvent(webview, 'dom-ready')
      webview.openDevTools()

      await waitForDevToolsFocused
      webview.closeDevTools()
    })
  })

  describe('<webview>.reload()', () => {
    it('should emit beforeunload handler', async () => {
      await loadWebView(webview, {
        nodeintegration: 'on',
        src: `file://${fixtures}/pages/beforeunload-false.html`
      })

      // Event handler has to be added before reload.
      const waitForOnbeforeunload = waitForEvent(webview, 'ipc-message')

      webview.reload()

      const { channel } = await waitForOnbeforeunload
      expect(channel).to.equal('onbeforeunload')
    })
  })

  describe('<webview>.goForward()', () => {
    it('should work after a replaced history entry', (done) => {
      let loadCount = 1
      const listener = (e) => {
        if (loadCount === 1) {
          expect(e.channel).to.equal('history')
          expect(e.args[0]).to.equal(1)
          expect(webview.canGoBack()).to.be.false()
          expect(webview.canGoForward()).to.be.false()
        } else if (loadCount === 2) {
          expect(e.channel).to.equal('history')
          expect(e.args[0]).to.equal(2)
          expect(webview.canGoBack()).to.be.false()
          expect(webview.canGoForward()).to.be.true()
          webview.removeEventListener('ipc-message', listener)
        }
      }

      const loadListener = () => {
        if (loadCount === 1) {
          webview.src = `file://${fixtures}/pages/base-page.html`
        } else if (loadCount === 2) {
          expect(webview.canGoBack()).to.be.true()
          expect(webview.canGoForward()).to.be.false()

          webview.goBack()
        } else if (loadCount === 3) {
          webview.goForward()
        } else if (loadCount === 4) {
          expect(webview.canGoBack()).to.be.true()
          expect(webview.canGoForward()).to.be.false()

          webview.removeEventListener('did-finish-load', loadListener)
          done()
        }

        loadCount += 1
      }

      webview.addEventListener('ipc-message', listener)
      webview.addEventListener('did-finish-load', loadListener)

      loadWebView(webview, {
        nodeintegration: 'on',
        src: `file://${fixtures}/pages/history-replace.html`
      })
    })
  })

  // FIXME: https://github.com/electron/electron/issues/19397
  xdescribe('<webview>.clearHistory()', () => {
    it('should clear the navigation history', async () => {
      const message = waitForEvent(webview, 'ipc-message')
      await loadWebView(webview, {
        nodeintegration: 'on',
        src: `file://${fixtures}/pages/history.html`
      })
      const event = await message

      expect(event.channel).to.equal('history')
      expect(event.args[0]).to.equal(2)
      expect(webview.canGoBack()).to.be.true()

      webview.clearHistory()
      expect(webview.canGoBack()).to.be.false()
    })
  })

  describe('basic auth', () => {
    const auth = require('basic-auth')

    it('should authenticate with correct credentials', (done) => {
      const message = 'Authenticated'
      const server = http.createServer((req, res) => {
        const credentials = auth(req)
        if (credentials.name === 'test' && credentials.pass === 'test') {
          res.end(message)
        } else {
          res.end('failed')
        }
        server.close()
      })
      server.listen(0, '127.0.0.1', () => {
        const port = server.address().port
        webview.addEventListener('ipc-message', (e) => {
          expect(e.channel).to.equal(message)
          done()
        })
        loadWebView(webview, {
          nodeintegration: 'on',
          src: `file://${fixtures}/pages/basic-auth.html?port=${port}`
        })
      })
    })
  })

  describe('dom-ready event', () => {
    it('emits when document is loaded', (done) => {
      const server = http.createServer(() => {})
      server.listen(0, '127.0.0.1', () => {
        const port = server.address().port
        webview.addEventListener('dom-ready', () => {
          done()
        })
        loadWebView(webview, {
          src: `file://${fixtures}/pages/dom-ready.html?port=${port}`
        })
      })
    })

    it('throws a custom error when an API method is called before the event is emitted', () => {
      const expectedErrorMessage =
          'The WebView must be attached to the DOM ' +
          'and the dom-ready event emitted before this method can be called.'
      expect(() => { webview.stop() }).to.throw(expectedErrorMessage)
    })
  })

  describe('executeJavaScript', () => {
    it('should support user gesture', async () => {
      await loadWebView(webview, {
        src: `file://${fixtures}/pages/fullscreen.html`
      })

      // Event handler has to be added before js execution.
      const waitForEnterHtmlFullScreen = waitForEvent(webview, 'enter-html-full-screen')

      const jsScript = "document.querySelector('video').webkitRequestFullscreen()"
      webview.executeJavaScript(jsScript, true)

      return waitForEnterHtmlFullScreen
    })

    it('can return the result of the executed script', async () => {
      await loadWebView(webview, {
        src: 'about:blank'
      })

      const jsScript = "'4'+2"
      const expectedResult = '42'

      const result = await webview.executeJavaScript(jsScript)
      expect(result).to.equal(expectedResult)
    })
  })

  it('supports inserting CSS', async () => {
    await loadWebView(webview, { src: `file://${fixtures}/pages/base-page.html` })
    await webview.insertCSS('body { background-repeat: round; }')
    const result = await webview.executeJavaScript('window.getComputedStyle(document.body).getPropertyValue("background-repeat")')
    expect(result).to.equal('round')
  })

  it('supports removing inserted CSS', async () => {
    await loadWebView(webview, { src: `file://${fixtures}/pages/base-page.html` })
    const key = await webview.insertCSS('body { background-repeat: round; }')
    await webview.removeInsertedCSS(key)
    const result = await webview.executeJavaScript('window.getComputedStyle(document.body).getPropertyValue("background-repeat")')
    expect(result).to.equal('repeat')
  })

  describe('sendInputEvent', () => {
    it('can send keyboard event', async () => {
      loadWebView(webview, {
        nodeintegration: 'on',
        src: `file://${fixtures}/pages/onkeyup.html`
      })
      await waitForEvent(webview, 'dom-ready')

      const waitForIpcMessage = waitForEvent(webview, 'ipc-message')
      webview.sendInputEvent({
        type: 'keyup',
        keyCode: 'c',
        modifiers: ['shift']
      })

      const { channel, args } = await waitForIpcMessage
      expect(channel).to.equal('keyup')
      expect(args).to.deep.equal(['C', 'KeyC', 67, true, false])
    })

    it('can send mouse event', async () => {
      loadWebView(webview, {
        nodeintegration: 'on',
        src: `file://${fixtures}/pages/onmouseup.html`
      })
      await waitForEvent(webview, 'dom-ready')

      const waitForIpcMessage = waitForEvent(webview, 'ipc-message')
      webview.sendInputEvent({
        type: 'mouseup',
        modifiers: ['ctrl'],
        x: 10,
        y: 20
      })

      const { channel, args } = await waitForIpcMessage
      expect(channel).to.equal('mouseup')
      expect(args).to.deep.equal([10, 20, false, true])
    })
  })

  describe('media-started-playing media-paused events', () => {
    it('emits when audio starts and stops playing', async () => {
      await loadWebView(webview, { src: `file://${fixtures}/pages/base-page.html` })

      // With the new autoplay policy, audio elements must be unmuted
      // see https://goo.gl/xX8pDD.
      const source = `
        const audio = document.createElement("audio")
        audio.src = "../assets/tone.wav"
        document.body.appendChild(audio);
        audio.play()
      `
      webview.executeJavaScript(source, true)
      await waitForEvent(webview, 'media-started-playing')

      webview.executeJavaScript('document.querySelector("audio").pause()', true)
      await waitForEvent(webview, 'media-paused')
    })
  })

  describe('found-in-page event', () => {
    it('emits when a request is made', (done) => {
      let requestId = null
      const activeMatchOrdinal = []
      const listener = (e) => {
        expect(e.result.requestId).to.equal(requestId)
        expect(e.result.matches).to.equal(3)
        activeMatchOrdinal.push(e.result.activeMatchOrdinal)
        if (e.result.activeMatchOrdinal === e.result.matches) {
          expect(activeMatchOrdinal).to.deep.equal([1, 2, 3])
          webview.stopFindInPage('clearSelection')
          done()
        } else {
          listener2()
        }
      }
      const listener2 = () => {
        requestId = webview.findInPage('virtual')
      }
      webview.addEventListener('found-in-page', listener)
      webview.addEventListener('did-finish-load', listener2)
      loadWebView(webview, { src: `file://${fixtures}/pages/content.html` })
      // TODO(deepak1556): With https://codereview.chromium.org/2836973002
      // focus of the webContents is required when triggering the api.
      // Remove this workaround after determining the cause for
      // incorrect focus.
      webview.focus()
    })
  })

  describe('did-change-theme-color event', () => {
    it('emits when theme color changes', async () => {
      loadWebView(webview, {
        src: `file://${fixtures}/pages/theme-color.html`
      })
      await waitForEvent(webview, 'did-change-theme-color')
    })
  })

  describe('<webview>.getWebContentsId', () => {
    it('can return the WebContents ID', async () => {
      const src = 'about:blank'
      await loadWebView(webview, { src })

      expect(webview.getWebContentsId()).to.be.a('number')
    })
  })

  describe('<webview>.capturePage()', () => {
    before(function () {
      // TODO(miniak): figure out why this is failing on windows
      if (process.platform === 'win32') {
        this.skip()
      }
    })

    it('returns a Promise with a NativeImage', async () => {
      const src = 'data:text/html,%3Ch1%3EHello%2C%20World!%3C%2Fh1%3E'
      await loadWebView(webview, { src })

      const image = await webview.capturePage()
      const imgBuffer = image.toPNG()

      // Check the 25th byte in the PNG.
      // Values can be 0,2,3,4, or 6. We want 6, which is RGB + Alpha
      expect(imgBuffer[25]).to.equal(6)
    })
  })

  describe('<webview>.printToPDF()', () => {
    before(function () {
      if (!features.isPrintingEnabled()) {
        this.skip()
      }
    })

    it('can print to PDF', async () => {
      const src = 'data:text/html,%3Ch1%3EHello%2C%20World!%3C%2Fh1%3E'
      await loadWebView(webview, { src })

      const data = await webview.printToPDF({})
      expect(data).to.be.an.instanceof(Uint8Array).that.is.not.empty()
    })
  })

  describe('will-attach-webview event', () => {
    it('does not emit when src is not changed', (done) => {
      loadWebView(webview)
      setTimeout(() => {
        const expectedErrorMessage =
            'The WebView must be attached to the DOM ' +
            'and the dom-ready event emitted before this method can be called.'
        expect(() => { webview.stop() }).to.throw(expectedErrorMessage)
        done()
      })
    })

    it('supports changing the web preferences', async () => {
      ipcRenderer.send('disable-node-on-next-will-attach-webview')
      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        nodeintegration: 'yes',
        src: `file://${fixtures}/pages/a.html`
      })

      const types = JSON.parse(message)
      expect(types).to.include({
        require: 'undefined',
        module: 'undefined',
        process: 'undefined',
        global: 'undefined'
      })
    })

    it('supports preventing a webview from being created', async () => {
      ipcRenderer.send('prevent-next-will-attach-webview')

      loadWebView(webview, {
        src: `file://${fixtures}/pages/c.html`
      })
      await waitForEvent(webview, 'destroyed')
    })

    it('supports removing the preload script', async () => {
      ipcRenderer.send('disable-preload-on-next-will-attach-webview')

      const message = await startLoadingWebViewAndWaitForMessage(webview, {
        nodeintegration: 'yes',
        preload: path.join(fixtures, 'module', 'preload-set-global.js'),
        src: `file://${fixtures}/pages/a.html`
      })

      expect(message).to.equal('undefined')
    })
  })

  describe('DOM events', () => {
    let div

    beforeEach(() => {
      div = document.createElement('div')
      div.style.width = '100px'
      div.style.height = '10px'
      div.style.overflow = 'hidden'
      webview.style.height = '100%'
      webview.style.width = '100%'
    })

    afterEach(() => {
      if (div != null) div.remove()
    })

    const generateSpecs = (description, sandbox) => {
      describe(description, () => {
        // TODO(nornagon): disabled during chromium roll 2019-06-11 due to a
        // 'ResizeObserver loop limit exceeded' error on Windows
        xit('emits resize events', async () => {
          const firstResizeSignal = waitForEvent(webview, 'resize')
          const domReadySignal = waitForEvent(webview, 'dom-ready')

          webview.src = `file://${fixtures}/pages/a.html`
          webview.webpreferences = `sandbox=${sandbox ? 'yes' : 'no'}`
          div.appendChild(webview)
          document.body.appendChild(div)

          const firstResizeEvent = await firstResizeSignal
          expect(firstResizeEvent.target).to.equal(webview)
          expect(firstResizeEvent.newWidth).to.equal(100)
          expect(firstResizeEvent.newHeight).to.equal(10)

          await domReadySignal

          const secondResizeSignal = waitForEvent(webview, 'resize')

          const newWidth = 1234
          const newHeight = 789
          div.style.width = `${newWidth}px`
          div.style.height = `${newHeight}px`

          const secondResizeEvent = await secondResizeSignal
          expect(secondResizeEvent.target).to.equal(webview)
          expect(secondResizeEvent.newWidth).to.equal(newWidth)
          expect(secondResizeEvent.newHeight).to.equal(newHeight)
        })

        it('emits focus event', async () => {
          const domReadySignal = waitForEvent(webview, 'dom-ready')
          webview.src = `file://${fixtures}/pages/a.html`
          webview.webpreferences = `sandbox=${sandbox ? 'yes' : 'no'}`
          document.body.appendChild(webview)

          await domReadySignal

          // If this test fails, check if webview.focus() still works.
          const focusSignal = waitForEvent(webview, 'focus')
          webview.focus()

          await focusSignal
        })
      })
    }

    generateSpecs('without sandbox', false)
    generateSpecs('with sandbox', true)
  })
})