text: /**
   * Copyright 2017 Google Inc. All rights reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  const fs = require('fs');
  const path = require('path');
  const utils = require('./utils');
  const {waitEvent} = utils;
  
  let asyncawait = true;
  try {
    new Function('async function foo() {await 1}');
  } catch (e) {
    asyncawait = false;
  }
  
  module.exports.addTests = function({testRunner, expect, headless, puppeteer, CHROME}) {
    const {describe, xdescribe, fdescribe, describe_fails_ffox} = testRunner;
    const {it, fit, xit, it_fails_ffox} = testRunner;
    const {beforeAll, beforeEach, afterAll, afterEach} = testRunner;
  
    describe('Page.close', function() {
      it('should reject all promises when page is closed', async({context}) => {
        const newPage = await context.newPage();
        let error = null;
        await Promise.all([
          newPage.evaluate(() => new Promise(r => {})).catch(e => error = e),
          newPage.close(),
        ]);
        expect(error.message).toContain('Protocol error');
      });
      it('should not be visible in browser.pages', async({browser}) => {
        const newPage = await browser.newPage();
        expect(await browser.pages()).toContain(newPage);
        await newPage.close();
        expect(await browser.pages()).not.toContain(newPage);
      });
      it('should run beforeunload if asked for', async({context, server}) => {
        const newPage = await context.newPage();
        await newPage.goto(server.PREFIX + '/beforeunload.html');
        // We have to interact with a page so that 'beforeunload' handlers
        // fire.
        await newPage.click('body');
        const pageClosingPromise = newPage.close({ runBeforeUnload: true });
        const dialog = await waitEvent(newPage, 'dialog');
        expect(dialog.type()).toBe('beforeunload');
        expect(dialog.defaultValue()).toBe('');
        if (CHROME)
          expect(dialog.message()).toBe('');
        else
          expect(dialog.message()).toBe('This page is asking you to confirm that you want to leave - data you have entered may not be saved.');
        await dialog.accept();
        await pageClosingPromise;
      });
      it('should *not* run beforeunload by default', async({context, server}) => {
        const newPage = await context.newPage();
        await newPage.goto(server.PREFIX + '/beforeunload.html');
        // We have to interact with a page so that 'beforeunload' handlers
        // fire.
        await newPage.click('body');
        await newPage.close();
      });
      it('should set the page close state', async({context}) => {
        const newPage = await context.newPage();
        expect(newPage.isClosed()).toBe(false);
        await newPage.close();
        expect(newPage.isClosed()).toBe(true);
      });
    });
  
    describe('Page.Events.Load', function() {
      it('should fire when expected', async({page, server}) => {
        await Promise.all([
          page.goto('about:blank'),
          utils.waitEvent(page, 'load'),
        ]);
      });
    });
  
    (asyncawait ? describe : xdescribe)('Async stacks', () => {
      it('should work', async({page, server}) => {
        server.setRoute('/empty.html', (req, res) => {
          res.statusCode = 204;
          res.end();
        });
        let error = null;
        await page.goto(server.EMPTY_PAGE).catch(e => error = e);
        expect(error).not.toBe(null);
        expect(error.stack).toContain(__filename);
      });
    });
  
    describe_fails_ffox('Page.Events.error', function() {
      it('should throw when page crashes', async({page}) => {
        let error = null;
        page.on('error', err => error = err);
        page.goto('chrome://crash').catch(e => {});
        await waitEvent(page, 'error');
        expect(error.message).toBe('Page crashed!');
      });
    });
  
    describe('Page.Events.Popup', function() {
      it('should work', async({page}) => {
        const [popup] = await Promise.all([
          new Promise(x => page.once('popup', x)),
          page.evaluate(() => window.open('about:blank')),
        ]);
        expect(await page.evaluate(() => !!window.opener)).toBe(false);
        expect(await popup.evaluate(() => !!window.opener)).toBe(true);
      });
      it('should work with noopener', async({page}) => {
        const [popup] = await Promise.all([
          new Promise(x => page.once('popup', x)),
          page.evaluate(() => window.open('about:blank', null, 'noopener')),
        ]);
        expect(await page.evaluate(() => !!window.opener)).toBe(false);
        expect(await popup.evaluate(() => !!window.opener)).toBe(false);
      });
      it('should work with clicking target=_blank', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        await page.setContent('<a target=_blank href="/one-style.html">yo</a>');
        const [popup] = await Promise.all([
          new Promise(x => page.once('popup', x)),
          page.click('a'),
        ]);
        expect(await page.evaluate(() => !!window.opener)).toBe(false);
        expect(await popup.evaluate(() => !!window.opener)).toBe(true);
      });
      it('should work with fake-clicking target=_blank and rel=noopener', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        await page.setContent('<a target=_blank rel=noopener href="/one-style.html">yo</a>');
        const [popup] = await Promise.all([
          new Promise(x => page.once('popup', x)),
          page.$eval('a', a => a.click()),
        ]);
        expect(await page.evaluate(() => !!window.opener)).toBe(false);
        expect(await popup.evaluate(() => !!window.opener)).toBe(false);
      });
      it('should work with clicking target=_blank and rel=noopener', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        await page.setContent('<a target=_blank rel=noopener href="/one-style.html">yo</a>');
        const [popup] = await Promise.all([
          new Promise(x => page.once('popup', x)),
          page.click('a'),
        ]);
        expect(await page.evaluate(() => !!window.opener)).toBe(false);
        expect(await popup.evaluate(() => !!window.opener)).toBe(false);
      });
    });
  
    describe('BrowserContext.overridePermissions', function() {
      function getPermission(page, name) {
        return page.evaluate(name => navigator.permissions.query({name}).then(result => result.state), name);
      }
  
      it('should be prompt by default', async({page, server, context}) => {
        await page.goto(server.EMPTY_PAGE);
        expect(await getPermission(page, 'geolocation')).toBe('prompt');
      });
      it('should deny permission when not listed', async({page, server, context}) => {
        await page.goto(server.EMPTY_PAGE);
        await context.overridePermissions(server.EMPTY_PAGE, []);
        expect(await getPermission(page, 'geolocation')).toBe('denied');
      });
      it('should fail when bad permission is given', async({page, server, context}) => {
        await page.goto(server.EMPTY_PAGE);
        let error = null;
        await context.overridePermissions(server.EMPTY_PAGE, ['foo']).catch(e => error = e);
        expect(error.message).toBe('Unknown permission: foo');
      });
      it('should grant permission when listed', async({page, server, context}) => {
        await page.goto(server.EMPTY_PAGE);
        await context.overridePermissions(server.EMPTY_PAGE, ['geolocation']);
        expect(await getPermission(page, 'geolocation')).toBe('granted');
      });
      it('should reset permissions', async({page, server, context}) => {
        await page.goto(server.EMPTY_PAGE);
        await context.overridePermissions(server.EMPTY_PAGE, ['geolocation']);
        expect(await getPermission(page, 'geolocation')).toBe('granted');
        await context.clearPermissionOverrides();
        expect(await getPermission(page, 'geolocation')).toBe('prompt');
      });
      it('should trigger permission onchange', async({page, server, context}) => {
        await page.goto(server.EMPTY_PAGE);
        await page.evaluate(() => {
          window.events = [];
          return navigator.permissions.query({name: 'geolocation'}).then(function(result) {
            window.events.push(result.state);
            result.onchange = function() {
              window.events.push(result.state);
            };
          });
        });
        expect(await page.evaluate(() => window.events)).toEqual(['prompt']);
        await context.overridePermissions(server.EMPTY_PAGE, []);
        expect(await page.evaluate(() => window.events)).toEqual(['prompt', 'denied']);
        await context.overridePermissions(server.EMPTY_PAGE, ['geolocation']);
        expect(await page.evaluate(() => window.events)).toEqual(['prompt', 'denied', 'granted']);
        await context.clearPermissionOverrides();
        expect(await page.evaluate(() => window.events)).toEqual(['prompt', 'denied', 'granted', 'prompt']);
      });
      it('should isolate permissions between browser contexs', async({page, server, context, browser}) => {
        await page.goto(server.EMPTY_PAGE);
        const otherContext = await browser.createIncognitoBrowserContext();
        const otherPage = await otherContext.newPage();
        await otherPage.goto(server.EMPTY_PAGE);
        expect(await getPermission(page, 'geolocation')).toBe('prompt');
        expect(await getPermission(otherPage, 'geolocation')).toBe('prompt');
  
        await context.overridePermissions(server.EMPTY_PAGE, []);
        await otherContext.overridePermissions(server.EMPTY_PAGE, ['geolocation']);
        expect(await getPermission(page, 'geolocation')).toBe('denied');
        expect(await getPermission(otherPage, 'geolocation')).toBe('granted');
  
        await context.clearPermissionOverrides();
        expect(await getPermission(page, 'geolocation')).toBe('prompt');
        expect(await getPermission(otherPage, 'geolocation')).toBe('granted');
  
        await otherContext.close();
      });
    });
  
    describe_fails_ffox('Page.setGeolocation', function() {
      it('should work', async({page, server, context}) => {
        await context.overridePermissions(server.PREFIX, ['geolocation']);
        await page.goto(server.EMPTY_PAGE);
        await page.setGeolocation({longitude: 10, latitude: 10});
        const geolocation = await page.evaluate(() => new Promise(resolve => navigator.geolocation.getCurrentPosition(position => {
          resolve({latitude: position.coords.latitude, longitude: position.coords.longitude});
        })));
        expect(geolocation).toEqual({
          latitude: 10,
          longitude: 10
        });
      });
      it('should throw when invalid longitude', async({page, server, context}) => {
        let error = null;
        try {
          await page.setGeolocation({longitude: 200, latitude: 10});
        } catch (e) {
          error = e;
        }
        expect(error.message).toContain('Invalid longitude "200"');
      });
    });
  
    describe_fails_ffox('Page.setOfflineMode', function() {
      it('should work', async({page, server}) => {
        await page.setOfflineMode(true);
        let error = null;
        await page.goto(server.EMPTY_PAGE).catch(e => error = e);
        expect(error).toBeTruthy();
        await page.setOfflineMode(false);
        const response = await page.reload();
        expect(response.status()).toBe(200);
      });
      it('should emulate navigator.onLine', async({page, server}) => {
        expect(await page.evaluate(() => window.navigator.onLine)).toBe(true);
        await page.setOfflineMode(true);
        expect(await page.evaluate(() => window.navigator.onLine)).toBe(false);
        await page.setOfflineMode(false);
        expect(await page.evaluate(() => window.navigator.onLine)).toBe(true);
      });
    });
  
    describe_fails_ffox('ExecutionContext.queryObjects', function() {
      it('should work', async({page, server}) => {
        // Instantiate an object
        await page.evaluate(() => window.set = new Set(['hello', 'world']));
        const prototypeHandle = await page.evaluateHandle(() => Set.prototype);
        const objectsHandle = await page.queryObjects(prototypeHandle);
        const count = await page.evaluate(objects => objects.length, objectsHandle);
        expect(count).toBe(1);
        const values = await page.evaluate(objects => Array.from(objects[0].values()), objectsHandle);
        expect(values).toEqual(['hello', 'world']);
      });
      it('should work for non-blank page', async({page, server}) => {
        // Instantiate an object
        await page.goto(server.EMPTY_PAGE);
        await page.evaluate(() => window.set = new Set(['hello', 'world']));
        const prototypeHandle = await page.evaluateHandle(() => Set.prototype);
        const objectsHandle = await page.queryObjects(prototypeHandle);
        const count = await page.evaluate(objects => objects.length, objectsHandle);
        expect(count).toBe(1);
      });
      it('should fail for disposed handles', async({page, server}) => {
        const prototypeHandle = await page.evaluateHandle(() => HTMLBodyElement.prototype);
        await prototypeHandle.dispose();
        let error = null;
        await page.queryObjects(prototypeHandle).catch(e => error = e);
        expect(error.message).toBe('Prototype JSHandle is disposed!');
      });
      it('should fail primitive values as prototypes', async({page, server}) => {
        const prototypeHandle = await page.evaluateHandle(() => 42);
        let error = null;
        await page.queryObjects(prototypeHandle).catch(e => error = e);
        expect(error.message).toBe('Prototype JSHandle must not be referencing primitive value');
      });
    });
  
    describe('Page.Events.Console', function() {
      it('should work', async({page, server}) => {
        let message = null;
        page.once('console', m => message = m);
        await Promise.all([
          page.evaluate(() => console.log('hello', 5, {foo: 'bar'})),
          waitEvent(page, 'console')
        ]);
        expect(message.text()).toEqual('hello 5 JSHandle@object');
        expect(message.type()).toEqual('log');
        expect(await message.args()[0].jsonValue()).toEqual('hello');
        expect(await message.args()[1].jsonValue()).toEqual(5);
        expect(await message.args()[2].jsonValue()).toEqual({foo: 'bar'});
      });
      it('should work for different console API calls', async({page, server}) => {
        const messages = [];
        page.on('console', msg => messages.push(msg));
        // All console events will be reported before `page.evaluate` is finished.
        await page.evaluate(() => {
          // A pair of time/timeEnd generates only one Console API call.
          console.time('calling console.time');
          console.timeEnd('calling console.time');
          console.trace('calling console.trace');
          console.dir('calling console.dir');
          console.warn('calling console.warn');
          console.error('calling console.error');
          console.log(Promise.resolve('should not wait until resolved!'));
        });
        expect(messages.map(msg => msg.type())).toEqual([
          'timeEnd', 'trace', 'dir', 'warning', 'error', 'log'
        ]);
        expect(messages[0].text()).toContain('calling console.time');
        expect(messages.slice(1).map(msg => msg.text())).toEqual([
          'calling console.trace',
          'calling console.dir',
          'calling console.warn',
          'calling console.error',
          'JSHandle@promise',
        ]);
      });
      it('should not fail for window object', async({page, server}) => {
        let message = null;
        page.once('console', msg => message = msg);
        await Promise.all([
          page.evaluate(() => console.error(window)),
          waitEvent(page, 'console')
        ]);
        expect(message.text()).toBe('JSHandle@object');
      });
      it('should trigger correct Log', async({page, server}) => {
        await page.goto('about:blank');
        const [message] = await Promise.all([
          waitEvent(page, 'console'),
          page.evaluate(async url => fetch(url).catch(e => {}), server.EMPTY_PAGE)
        ]);
        expect(message.text()).toContain('Access-Control-Allow-Origin');
        if (CHROME)
          expect(message.type()).toEqual('error');
        else
          expect(message.type()).toEqual('warn');
      });
      it_fails_ffox('should have location when fetch fails', async({page, server}) => {
        // The point of this test is to make sure that we report console messages from
        // Log domain: https://vanilla.aslushnikov.com/?Log.entryAdded
        await page.goto(server.EMPTY_PAGE);
        const [message] = await Promise.all([
          waitEvent(page, 'console'),
          page.setContent(`<script>fetch('http://wat');</script>`),
        ]);
        expect(message.text()).toContain(`ERR_NAME_NOT_RESOLVED`);
        expect(message.type()).toEqual('error');
        expect(message.location()).toEqual({
          url: 'http://wat/',
          lineNumber: undefined
        });
      });
      it('should have location for console API calls', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        const [message] = await Promise.all([
          waitEvent(page, 'console'),
          page.goto(server.PREFIX + '/consolelog.html'),
        ]);
        expect(message.text()).toBe('yellow');
        expect(message.type()).toBe('log');
        expect(message.location()).toEqual({
          url: server.PREFIX + '/consolelog.html',
          lineNumber: 7,
          columnNumber: CHROME ? 14 : 6, // console.|log vs |console.log
        });
      });
      // @see https://github.com/GoogleChrome/puppeteer/issues/3865
      it_fails_ffox('should not throw when there are console messages in detached iframes', async({browser, page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        await page.evaluate(async() => {
          // 1. Create a popup that Puppeteer is not connected to.
          const win = window.open(window.location.href, 'Title', 'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=yes,resizable=yes,width=780,height=200,top=0,left=0');
          await new Promise(x => win.onload = x);
          // 2. In this popup, create an iframe that console.logs a message.
          win.document.body.innerHTML = `<iframe src='/consolelog.html'></iframe>`;
          const frame = win.document.querySelector('iframe');
          await new Promise(x => frame.onload = x);
          // 3. After that, remove the iframe.
          frame.remove();
        });
        const popupTarget = page.browserContext().targets().find(target => target !== page.target());
        // 4. Connect to the popup and make sure it doesn't throw.
        await popupTarget.page();
      });
    });
  
    describe('Page.Events.DOMContentLoaded', function() {
      it('should fire when expected', async({page, server}) => {
        page.goto('about:blank');
        await waitEvent(page, 'domcontentloaded');
      });
    });
  
    describe_fails_ffox('Page.metrics', function() {
      it('should get metrics from a page', async({page, server}) => {
        await page.goto('about:blank');
        const metrics = await page.metrics();
        checkMetrics(metrics);
      });
      it('metrics event fired on console.timeStamp', async({page, server}) => {
        const metricsPromise = new Promise(fulfill => page.once('metrics', fulfill));
        await page.evaluate(() => console.timeStamp('test42'));
        const metrics = await metricsPromise;
        expect(metrics.title).toBe('test42');
        checkMetrics(metrics.metrics);
      });
      function checkMetrics(metrics) {
        const metricsToCheck = new Set([
          'Timestamp',
          'Documents',
          'Frames',
          'JSEventListeners',
          'Nodes',
          'LayoutCount',
          'RecalcStyleCount',
          'LayoutDuration',
          'RecalcStyleDuration',
          'ScriptDuration',
          'TaskDuration',
          'JSHeapUsedSize',
          'JSHeapTotalSize',
        ]);
        for (const name in metrics) {
          expect(metricsToCheck.has(name)).toBeTruthy();
          expect(metrics[name]).toBeGreaterThanOrEqual(0);
          metricsToCheck.delete(name);
        }
        expect(metricsToCheck.size).toBe(0);
      }
    });
  
    describe('Page.waitForRequest', function() {
      it('should work', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        const [request] = await Promise.all([
          page.waitForRequest(server.PREFIX + '/digits/2.png'),
          page.evaluate(() => {
            fetch('/digits/1.png');
            fetch('/digits/2.png');
            fetch('/digits/3.png');
          })
        ]);
        expect(request.url()).toBe(server.PREFIX + '/digits/2.png');
      });
      it('should work with predicate', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        const [request] = await Promise.all([
          page.waitForRequest(request => request.url() === server.PREFIX + '/digits/2.png'),
          page.evaluate(() => {
            fetch('/digits/1.png');
            fetch('/digits/2.png');
            fetch('/digits/3.png');
          })
        ]);
        expect(request.url()).toBe(server.PREFIX + '/digits/2.png');
      });
      it('should respect timeout', async({page, server}) => {
        let error = null;
        await page.waitForRequest(() => false, {timeout: 1}).catch(e => error = e);
        expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
      });
      it('should respect default timeout', async({page, server}) => {
        let error = null;
        page.setDefaultTimeout(1);
        await page.waitForRequest(() => false).catch(e => error = e);
        expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
      });
      it('should work with no timeout', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        const [request] = await Promise.all([
          page.waitForRequest(server.PREFIX + '/digits/2.png', {timeout: 0}),
          page.evaluate(() => setTimeout(() => {
            fetch('/digits/1.png');
            fetch('/digits/2.png');
            fetch('/digits/3.png');
          }, 50))
        ]);
        expect(request.url()).toBe(server.PREFIX + '/digits/2.png');
      });
    });
  
    describe('Page.waitForResponse', function() {
      it('should work', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        const [response] = await Promise.all([
          page.waitForResponse(server.PREFIX + '/digits/2.png'),
          page.evaluate(() => {
            fetch('/digits/1.png');
            fetch('/digits/2.png');
            fetch('/digits/3.png');
          })
        ]);
        expect(response.url()).toBe(server.PREFIX + '/digits/2.png');
      });
      it('should respect timeout', async({page, server}) => {
        let error = null;
        await page.waitForResponse(() => false, {timeout: 1}).catch(e => error = e);
        expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
      });
      it('should respect default timeout', async({page, server}) => {
        let error = null;
        page.setDefaultTimeout(1);
        await page.waitForResponse(() => false).catch(e => error = e);
        expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
      });
      it('should work with predicate', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        const [response] = await Promise.all([
          page.waitForResponse(response => response.url() === server.PREFIX + '/digits/2.png'),
          page.evaluate(() => {
            fetch('/digits/1.png');
            fetch('/digits/2.png');
            fetch('/digits/3.png');
          })
        ]);
        expect(response.url()).toBe(server.PREFIX + '/digits/2.png');
      });
      it('should work with no timeout', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        const [response] = await Promise.all([
          page.waitForResponse(server.PREFIX + '/digits/2.png', {timeout: 0}),
          page.evaluate(() => setTimeout(() => {
            fetch('/digits/1.png');
            fetch('/digits/2.png');
            fetch('/digits/3.png');
          }, 50))
        ]);
        expect(response.url()).toBe(server.PREFIX + '/digits/2.png');
      });
    });
  
    describe('Page.exposeFunction', function() {
      it('should work', async({page, server}) => {
        await page.exposeFunction('compute', function(a, b) {
          return a * b;
        });
        const result = await page.evaluate(async function() {
          return await compute(9, 4);
        });
        expect(result).toBe(36);
      });
      it('should throw exception in page context', async({page, server}) => {
        await page.exposeFunction('woof', function() {
          throw new Error('WOOF WOOF');
        });
        const {message, stack} = await page.evaluate(async() => {
          try {
            await woof();
          } catch (e) {
            return {message: e.message, stack: e.stack};
          }
        });
        expect(message).toBe('WOOF WOOF');
        expect(stack).toContain(__filename);
      });
      it('should support throwing "null"', async({page, server}) => {
        await page.exposeFunction('woof', function() {
          throw null;
        });
        const thrown = await page.evaluate(async() => {
          try {
            await woof();
          } catch (e) {
            return e;
          }
        });
        expect(thrown).toBe(null);
      });
      it('should be callable from-inside evaluateOnNewDocument', async({page, server}) => {
        let called = false;
        await page.exposeFunction('woof', function() {
          called = true;
        });
        await page.evaluateOnNewDocument(() => woof());
        await page.reload();
        expect(called).toBe(true);
      });
      it('should survive navigation', async({page, server}) => {
        await page.exposeFunction('compute', function(a, b) {
          return a * b;
        });
  
        await page.goto(server.EMPTY_PAGE);
        const result = await page.evaluate(async function() {
          return await compute(9, 4);
        });
        expect(result).toBe(36);
      });
      it('should await returned promise', async({page, server}) => {
        await page.exposeFunction('compute', function(a, b) {
          return Promise.resolve(a * b);
        });
  
        const result = await page.evaluate(async function() {
          return await compute(3, 5);
        });
        expect(result).toBe(15);
      });
      it('should work on frames', async({page, server}) => {
        await page.exposeFunction('compute', function(a, b) {
          return Promise.resolve(a * b);
        });
  
        await page.goto(server.PREFIX + '/frames/nested-frames.html');
        const frame = page.frames()[1];
        const result = await frame.evaluate(async function() {
          return await compute(3, 5);
        });
        expect(result).toBe(15);
      });
      it('should work on frames before navigation', async({page, server}) => {
        await page.goto(server.PREFIX + '/frames/nested-frames.html');
        await page.exposeFunction('compute', function(a, b) {
          return Promise.resolve(a * b);
        });
  
        const frame = page.frames()[1];
        const result = await frame.evaluate(async function() {
          return await compute(3, 5);
        });
        expect(result).toBe(15);
      });
    });
  
    describe('Page.Events.PageError', function() {
      it('should fire', async({page, server}) => {
        let error = null;
        page.once('pageerror', e => error = e);
        await Promise.all([
          page.goto(server.PREFIX + '/error.html'),
          waitEvent(page, 'pageerror')
        ]);
        expect(error.message).toContain('Fancy');
      });
    });
  
    describe('Page.setUserAgent', function() {
      it('should work', async({page, server}) => {
        expect(await page.evaluate(() => navigator.userAgent)).toContain('Mozilla');
        await page.setUserAgent('foobar');
        const [request] = await Promise.all([
          server.waitForRequest('/empty.html'),
          page.goto(server.EMPTY_PAGE),
        ]);
        expect(request.headers['user-agent']).toBe('foobar');
      });
      it('should work for subframes', async({page, server}) => {
        expect(await page.evaluate(() => navigator.userAgent)).toContain('Mozilla');
        await page.setUserAgent('foobar');
        const [request] = await Promise.all([
          server.waitForRequest('/empty.html'),
          utils.attachFrame(page, 'frame1', server.EMPTY_PAGE),
        ]);
        expect(request.headers['user-agent']).toBe('foobar');
      });
      it('should emulate device user-agent', async({page, server}) => {
        await page.goto(server.PREFIX + '/mobile.html');
        expect(await page.evaluate(() => navigator.userAgent)).not.toContain('iPhone');
        await page.setUserAgent(puppeteer.devices['iPhone 6'].userAgent);
        expect(await page.evaluate(() => navigator.userAgent)).toContain('iPhone');
      });
    });
  
    describe('Page.setContent', function() {
      const expectedOutput = '<html><head></head><body><div>hello</div></body></html>';
      it('should work', async({page, server}) => {
        await page.setContent('<div>hello</div>');
        const result = await page.content();
        expect(result).toBe(expectedOutput);
      });
      it('should work with doctype', async({page, server}) => {
        const doctype = '<!DOCTYPE html>';
        await page.setContent(`${doctype}<div>hello</div>`);
        const result = await page.content();
        expect(result).toBe(`${doctype}${expectedOutput}`);
      });
      it('should work with HTML 4 doctype', async({page, server}) => {
        const doctype = '<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" ' +
          '"http://www.w3.org/TR/html4/strict.dtd">';
        await page.setContent(`${doctype}<div>hello</div>`);
        const result = await page.content();
        expect(result).toBe(`${doctype}${expectedOutput}`);
      });
      it_fails_ffox('should respect timeout', async({page, server}) => {
        const imgPath = '/img.png';
        // stall for image
        server.setRoute(imgPath, (req, res) => {});
        let error = null;
        await page.setContent(`<img src="${server.PREFIX + imgPath}"></img>`, {timeout: 1}).catch(e => error = e);
        expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
      });
      it_fails_ffox('should respect default navigation timeout', async({page, server}) => {
        page.setDefaultNavigationTimeout(1);
        const imgPath = '/img.png';
        // stall for image
        server.setRoute(imgPath, (req, res) => {});
        let error = null;
        await page.setContent(`<img src="${server.PREFIX + imgPath}"></img>`).catch(e => error = e);
        expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
      });
      it_fails_ffox('should await resources to load', async({page, server}) => {
        const imgPath = '/img.png';
        let imgResponse = null;
        server.setRoute(imgPath, (req, res) => imgResponse = res);
        let loaded = false;
        const contentPromise = page.setContent(`<img src="${server.PREFIX + imgPath}"></img>`).then(() => loaded = true);
        await server.waitForRequest(imgPath);
        expect(loaded).toBe(false);
        imgResponse.end();
        await contentPromise;
      });
      it('should work fast enough', async({page, server}) => {
        for (let i = 0; i < 20; ++i)
          await page.setContent('<div>yo</div>');
      });
      it('should work with tricky content', async({page, server}) => {
        await page.setContent('<div>hello world</div>' + '\x7F');
        expect(await page.$eval('div', div => div.textContent)).toBe('hello world');
      });
    });
  
    describe_fails_ffox('Page.setBypassCSP', function() {
      it('should bypass CSP meta tag', async({page, server}) => {
        // Make sure CSP prohibits addScriptTag.
        await page.goto(server.PREFIX + '/csp.html');
        await page.addScriptTag({content: 'window.__injected = 42;'}).catch(e => void e);
        expect(await page.evaluate(() => window.__injected)).toBe(undefined);
  
        // By-pass CSP and try one more time.
        await page.setBypassCSP(true);
        await page.reload();
        await page.addScriptTag({content: 'window.__injected = 42;'});
        expect(await page.evaluate(() => window.__injected)).toBe(42);
      });
  
      it('should bypass CSP header', async({page, server}) => {
        // Make sure CSP prohibits addScriptTag.
        server.setCSP('/empty.html', 'default-src "self"');
        await page.goto(server.EMPTY_PAGE);
        await page.addScriptTag({content: 'window.__injected = 42;'}).catch(e => void e);
        expect(await page.evaluate(() => window.__injected)).toBe(undefined);
  
        // By-pass CSP and try one more time.
        await page.setBypassCSP(true);
        await page.reload();
        await page.addScriptTag({content: 'window.__injected = 42;'});
        expect(await page.evaluate(() => window.__injected)).toBe(42);
      });
  
      it('should bypass after cross-process navigation', async({page, server}) => {
        await page.setBypassCSP(true);
        await page.goto(server.PREFIX + '/csp.html');
        await page.addScriptTag({content: 'window.__injected = 42;'});
        expect(await page.evaluate(() => window.__injected)).toBe(42);
  
        await page.goto(server.CROSS_PROCESS_PREFIX + '/csp.html');
        await page.addScriptTag({content: 'window.__injected = 42;'});
        expect(await page.evaluate(() => window.__injected)).toBe(42);
      });
      it('should bypass CSP in iframes as well', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        {
          // Make sure CSP prohibits addScriptTag in an iframe.
          const frame = await utils.attachFrame(page, 'frame1', server.PREFIX + '/csp.html');
          await frame.addScriptTag({content: 'window.__injected = 42;'}).catch(e => void e);
          expect(await frame.evaluate(() => window.__injected)).toBe(undefined);
        }
  
        // By-pass CSP and try one more time.
        await page.setBypassCSP(true);
        await page.reload();
  
        {
          const frame = await utils.attachFrame(page, 'frame1', server.PREFIX + '/csp.html');
          await frame.addScriptTag({content: 'window.__injected = 42;'}).catch(e => void e);
          expect(await frame.evaluate(() => window.__injected)).toBe(42);
        }
      });
    });
  
    describe('Page.addScriptTag', function() {
      it('should throw an error if no options are provided', async({page, server}) => {
        let error = null;
        try {
          await page.addScriptTag('/injectedfile.js');
        } catch (e) {
          error = e;
        }
        expect(error.message).toBe('Provide an object with a `url`, `path` or `content` property');
      });
  
      it('should work with a url', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        const scriptHandle = await page.addScriptTag({ url: '/injectedfile.js' });
        expect(scriptHandle.asElement()).not.toBeNull();
        expect(await page.evaluate(() => __injected)).toBe(42);
      });
  
      it('should work with a url and type=module', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        await page.addScriptTag({ url: '/es6/es6import.js', type: 'module' });
        expect(await page.evaluate(() => __es6injected)).toBe(42);
      });
  
      it('should work with a path and type=module', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        await page.addScriptTag({ path: path.join(__dirname, 'assets/es6/es6pathimport.js'), type: 'module' });
        await page.waitForFunction('window.__es6injected');
        expect(await page.evaluate(() => __es6injected)).toBe(42);
      });
  
      it('should work with a content and type=module', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        await page.addScriptTag({ content: `import num from '/es6/es6module.js';window.__es6injected = num;`, type: 'module' });
        await page.waitForFunction('window.__es6injected');
        expect(await page.evaluate(() => __es6injected)).toBe(42);
      });
  
      it('should throw an error if loading from url fail', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        let error = null;
        try {
          await page.addScriptTag({ url: '/nonexistfile.js' });
        } catch (e) {
          error = e;
        }
        expect(error.message).toBe('Loading script from /nonexistfile.js failed');
      });
  
      it('should work with a path', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        const scriptHandle = await page.addScriptTag({ path: path.join(__dirname, 'assets/injectedfile.js') });
        expect(scriptHandle.asElement()).not.toBeNull();
        expect(await page.evaluate(() => __injected)).toBe(42);
      });
  
      it('should include sourcemap when path is provided', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        await page.addScriptTag({ path: path.join(__dirname, 'assets/injectedfile.js') });
        const result = await page.evaluate(() => __injectedError.stack);
        expect(result).toContain(path.join('assets', 'injectedfile.js'));
      });
  
      it('should work with content', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        const scriptHandle = await page.addScriptTag({ content: 'window.__injected = 35;' });
        expect(scriptHandle.asElement()).not.toBeNull();
        expect(await page.evaluate(() => __injected)).toBe(35);
      });
  
      it_fails_ffox('should throw when added with content to the CSP page', async({page, server}) => {
        await page.goto(server.PREFIX + '/csp.html');
        let error = null;
        await page.addScriptTag({ content: 'window.__injected = 35;' }).catch(e => error = e);
        expect(error).toBeTruthy();
      });
  
      it('should throw when added with URL to the CSP page', async({page, server}) => {
        await page.goto(server.PREFIX + '/csp.html');
        let error = null;
        await page.addScriptTag({ url: server.CROSS_PROCESS_PREFIX + '/injectedfile.js' }).catch(e => error = e);
        expect(error).toBeTruthy();
      });
    });
  
    describe('Page.addStyleTag', function() {
      it('should throw an error if no options are provided', async({page, server}) => {
        let error = null;
        try {
          await page.addStyleTag('/injectedstyle.css');
        } catch (e) {
          error = e;
        }
        expect(error.message).toBe('Provide an object with a `url`, `path` or `content` property');
      });
  
      it('should work with a url', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        const styleHandle = await page.addStyleTag({ url: '/injectedstyle.css' });
        expect(styleHandle.asElement()).not.toBeNull();
        expect(await page.evaluate(`window.getComputedStyle(document.querySelector('body')).getPropertyValue('background-color')`)).toBe('rgb(255, 0, 0)');
      });
  
      it('should throw an error if loading from url fail', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        let error = null;
        try {
          await page.addStyleTag({ url: '/nonexistfile.js' });
        } catch (e) {
          error = e;
        }
        expect(error.message).toBe('Loading style from /nonexistfile.js failed');
      });
  
      it('should work with a path', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        const styleHandle = await page.addStyleTag({ path: path.join(__dirname, 'assets/injectedstyle.css') });
        expect(styleHandle.asElement()).not.toBeNull();
        expect(await page.evaluate(`window.getComputedStyle(document.querySelector('body')).getPropertyValue('background-color')`)).toBe('rgb(255, 0, 0)');
      });
  
      it('should include sourcemap when path is provided', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        await page.addStyleTag({ path: path.join(__dirname, 'assets/injectedstyle.css') });
        const styleHandle = await page.$('style');
        const styleContent = await page.evaluate(style => style.innerHTML, styleHandle);
        expect(styleContent).toContain(path.join('assets', 'injectedstyle.css'));
      });
  
      it('should work with content', async({page, server}) => {
        await page.goto(server.EMPTY_PAGE);
        const styleHandle = await page.addStyleTag({ content: 'body { background-color: green; }' });
        expect(styleHandle.asElement()).not.toBeNull();
        expect(await page.evaluate(`window.getComputedStyle(document.querySelector('body')).getPropertyValue('background-color')`)).toBe('rgb(0, 128, 0)');
      });
  
      it_fails_ffox('should throw when added with content to the CSP page', async({page, server}) => {
        await page.goto(server.PREFIX + '/csp.html');
        let error = null;
        await page.addStyleTag({ content: 'body { background-color: green; }' }).catch(e => error = e);
        expect(error).toBeTruthy();
      });
  
      it('should throw when added with URL to the CSP page', async({page, server}) => {
        await page.goto(server.PREFIX + '/csp.html');
        let error = null;
        await page.addStyleTag({ url: server.CROSS_PROCESS_PREFIX + '/injectedstyle.css' }).catch(e => error = e);
        expect(error).toBeTruthy();
      });
    });
  
    describe('Page.url', function() {
      it('should work', async({page, server}) => {
        expect(page.url()).toBe('about:blank');
        await page.goto(server.EMPTY_PAGE);
        expect(page.url()).toBe(server.EMPTY_PAGE);
      });
    });
  
    describe('Page.setJavaScriptEnabled', function() {
      it('should work', async({page, server}) => {
        await page.setJavaScriptEnabled(false);
        await page.goto('data:text/html, <script>var something = "forbidden"</script>');
        let error = null;
        await page.evaluate('something').catch(e => error = e);
        expect(error.message).toContain('something is not defined');
  
        await page.setJavaScriptEnabled(true);
        await page.goto('data:text/html, <script>var something = "forbidden"</script>');
        expect(await page.evaluate('something')).toBe('forbidden');
      });
    });
  
    describe('Page.setCacheEnabled', function() {
      it('should enable or disable the cache based on the state passed', async({page, server}) => {
        await page.goto(server.PREFIX + '/cached/one-style.html');
        const [cachedRequest] = await Promise.all([
          server.waitForRequest('/cached/one-style.html'),
          page.reload(),
        ]);
        // Rely on "if-modified-since" caching in our test server.
        expect(cachedRequest.headers['if-modified-since']).not.toBe(undefined);
  
        await page.setCacheEnabled(false);
        const [nonCachedRequest] = await Promise.all([
          server.waitForRequest('/cached/one-style.html'),
          page.reload(),
        ]);
        expect(nonCachedRequest.headers['if-modified-since']).toBe(undefined);
      });
      it('should stay disabled when toggling request interception on/off', async({page, server}) => {
        await page.setCacheEnabled(false);
        await page.setRequestInterception(true);
        await page.setRequestInterception(false);
  
        await page.goto(server.PREFIX + '/cached/one-style.html');
        const [nonCachedRequest] = await Promise.all([
          server.waitForRequest('/cached/one-style.html'),
          page.reload(),
        ]);
        expect(nonCachedRequest.headers['if-modified-since']).toBe(undefined);
      });
    });
  
    // Printing to pdf is currently only supported in headless
    (headless ? describe_fails_ffox : xdescribe)('Page.pdf', function() {
      it('should be able to save file', async({page, server}) => {
        const outputFile = __dirname + '/assets/output.pdf';
        await page.pdf({path: outputFile});
        expect(fs.readFileSync(outputFile).byteLength).toBeGreaterThan(0);
        fs.unlinkSync(outputFile);
      });
    });
  
    describe('Page.title', function() {
      it('should return the page title', async({page, server}) => {
        await page.goto(server.PREFIX + '/title.html');
        expect(await page.title()).toBe('Woof-Woof');
      });
    });
  
    describe('Page.select', function() {
      it('should select single option', async({page, server}) => {
        await page.goto(server.PREFIX + '/input/select.html');
        await page.select('select', 'blue');
        expect(await page.evaluate(() => result.onInput)).toEqual(['blue']);
        expect(await page.evaluate(() => result.onChange)).toEqual(['blue']);
      });
      it('should select only first option', async({page, server}) => {
        await page.goto(server.PREFIX + '/input/select.html');
        await page.select('select', 'blue', 'green', 'red');
        expect(await page.evaluate(() => result.onInput)).toEqual(['blue']);
        expect(await page.evaluate(() => result.onChange)).toEqual(['blue']);
      });
      it('should select multiple options', async({page, server}) => {
        await page.goto(server.PREFIX + '/input/select.html');
        await page.evaluate(() => makeMultiple());
        await page.select('select', 'blue', 'green', 'red');
        expect(await page.evaluate(() => result.onInput)).toEqual(['blue', 'green', 'red']);
        expect(await page.evaluate(() => result.onChange)).toEqual(['blue', 'green', 'red']);
      });
      it('should respect event bubbling', async({page, server}) => {
        await page.goto(server.PREFIX + '/input/select.html');
        await page.select('select', 'blue');
        expect(await page.evaluate(() => result.onBubblingInput)).toEqual(['blue']);
        expect(await page.evaluate(() => result.onBubblingChange)).toEqual(['blue']);
      });
      it('should throw when element is not a <select>', async({page, server}) => {
        let error = null;
        await page.goto(server.PREFIX + '/input/select.html');
        await page.select('body', '').catch(e => error = e);
        expect(error.message).toContain('Element is not a <select> element.');
      });
      it('should return [] on no matched values', async({page, server}) => {
        await page.goto(server.PREFIX + '/input/select.html');
        const result = await page.select('select','42','abc');
        expect(result).toEqual([]);
      });
      it('should return an array of matched values', async({page, server}) => {
        await page.goto(server.PREFIX + '/input/select.html');
        await page.evaluate(() => makeMultiple());
        const result = await page.select('select','blue','black','magenta');
        expect(result.reduce((accumulator,current) => ['blue', 'black', 'magenta'].includes(current) && accumulator, true)).toEqual(true);
      });
      it('should return an array of one element when multiple is not set', async({page, server}) => {
        await page.goto(server.PREFIX + '/input/select.html');
        const result = await page.select('select','42','blue','black','magenta');
        expect(result.length).toEqual(1);
      });
      it('should return [] on no values',async({page, server}) => {
        await page.goto(server.PREFIX + '/input/select.html');
        const result = await page.select('select');
        expect(result).toEqual([]);
      });
      it('should deselect all options when passed no values for a multiple select',async({page, server}) => {
        await page.goto(server.PREFIX + '/input/select.html');
        await page.evaluate(() => makeMultiple());
        await page.select('select','blue','black','magenta');
        await page.select('select');
        expect(await page.$eval('select', select => Array.from(select.options).every(option => !option.selected))).toEqual(true);
      });
      it('should deselect all options when passed no values for a select without multiple',async({page, server}) => {
        await page.goto(server.PREFIX + '/input/select.html');
        await page.select('select','blue','black','magenta');
        await page.select('select');
        expect(await page.$eval('select', select => Array.from(select.options).every(option => !option.selected))).toEqual(true);
      });
      it('should throw if passed in non-strings', async({page, server}) => {
        await page.setContent('<select><option value="12"/></select>');
        let error = null;
        try {
          await page.select('select', 12);
        } catch (e) {
          error = e;
        }
        expect(error.message).toContain('Values must be strings');
      });
      // @see https://github.com/GoogleChrome/puppeteer/issues/3327
      it_fails_ffox('should work when re-defining top-level Event class', async({page, server}) => {
        await page.goto(server.PREFIX + '/input/select.html');
        await page.evaluate(() => window.Event = null);
        await page.select('select', 'blue');
        expect(await page.evaluate(() => result.onInput)).toEqual(['blue']);
        expect(await page.evaluate(() => result.onChange)).toEqual(['blue']);
      });
    });
  
    describe('Page.Events.Close', function() {
      it('should work with window.close', async function({ page, context, server }) {
        const newPagePromise = new Promise(fulfill => context.once('targetcreated', target => fulfill(target.page())));
        await page.evaluate(() => window['newPage'] = window.open('about:blank'));
        const newPage = await newPagePromise;
        const closedPromise = new Promise(x => newPage.on('close', x));
        await page.evaluate(() => window['newPage'].close());
        await closedPromise;
      });
      it('should work with page.close', async function({ page, context, server }) {
        const newPage = await context.newPage();
        const closedPromise = new Promise(x => newPage.on('close', x));
        await newPage.close();
        await closedPromise;
      });
    });
  
    describe('Page.browser', function() {
      it('should return the correct browser instance', async function({ page, browser }) {
        expect(page.browser()).toBe(browser);
      });
    });
  
    describe('Page.browserContext', function() {
      it('should return the correct browser instance', async function({page, context, browser}) {
        expect(page.browserContext()).toBe(context);
      });
    });
  };
  