/**
 * 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;
const expect = require('expect');
const {
  getTestState,
  setupTestBrowserHooks,
  setupTestPageAndContextHooks,
} = require('./mocha-utils');

describe('Page', function () {
  setupTestBrowserHooks();
  setupTestPageAndContextHooks();
  describe('Page.close', function () {
    it('should reject all promises when page is closed', async () => {
      const { context } = getTestState();

      const newPage = await context.newPage();
      let error = null;
      await Promise.all([
        newPage
          .evaluate(() => new Promise((r) => {}))
          .catch((error_) => (error = error_)),
        newPage.close(),
      ]);
      expect(error.message).toContain('Protocol error');
    });
    it('should not be visible in browser.pages', async () => {
      const { browser } = getTestState();

      const newPage = await browser.newPage();
      expect(await browser.pages()).toContain(newPage);
      await newPage.close();
      expect(await browser.pages()).not.toContain(newPage);
    });
    itFailsFirefox('should run beforeunload if asked for', async () => {
      const { context, server, isChrome } = getTestState();

      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 (isChrome) 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;
    });
    itFailsFirefox('should *not* run beforeunload by default', async () => {
      const { context, server } = getTestState();

      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 () => {
      const { context } = getTestState();

      const newPage = await context.newPage();
      expect(newPage.isClosed()).toBe(false);
      await newPage.close();
      expect(newPage.isClosed()).toBe(true);
    });
    itFailsFirefox('should terminate network waiters', async () => {
      const { context, server } = getTestState();

      const newPage = await context.newPage();
      const results = await Promise.all([
        newPage.waitForRequest(server.EMPTY_PAGE).catch((error) => error),
        newPage.waitForResponse(server.EMPTY_PAGE).catch((error) => error),
        newPage.close(),
      ]);
      for (let i = 0; i < 2; i++) {
        const message = results[i].message;
        expect(message).toContain('Target closed');
        expect(message).not.toContain('Timeout');
      }
    });
  });

  describe('Page.Events.Load', function () {
    it('should fire when expected', async () => {
      const { page } = getTestState();

      await Promise.all([
        page.goto('about:blank'),
        utils.waitEvent(page, 'load'),
      ]);
    });
  });

  describeFailsFirefox('Async stacks', () => {
    it('should work', async () => {
      const { page, server } = getTestState();

      server.setRoute('/empty.html', (req, res) => {
        res.statusCode = 204;
        res.end();
      });
      let error = null;
      await page.goto(server.EMPTY_PAGE).catch((error_) => (error = error_));
      expect(error).not.toBe(null);
      expect(error.stack).toContain(__filename);
    });
  });

  describeFailsFirefox('Page.Events.error', function () {
    it('should throw when page crashes', async () => {
      const { page } = getTestState();

      let error = null;
      page.on('error', (err) => (error = err));
      page.goto('chrome://crash').catch((error_) => {});
      await waitEvent(page, 'error');
      expect(error.message).toBe('Page crashed!');
    });
  });

  describeFailsFirefox('Page.Events.Popup', function () {
    it('should work', async () => {
      const { page } = getTestState();

      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 () => {
      const { page } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      await page.goto(server.EMPTY_PAGE);
      expect(await getPermission(page, 'geolocation')).toBe('prompt');
    });
    itFailsFirefox('should deny permission when not listed', async () => {
      const { page, server, context } = getTestState();

      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 () => {
      const { page, server, context } = getTestState();

      await page.goto(server.EMPTY_PAGE);
      let error = null;
      await context
        .overridePermissions(server.EMPTY_PAGE, ['foo'])
        .catch((error_) => (error = error_));
      expect(error.message).toBe('Unknown permission: foo');
    });
    itFailsFirefox('should grant permission when listed', async () => {
      const { page, server, context } = getTestState();

      await page.goto(server.EMPTY_PAGE);
      await context.overridePermissions(server.EMPTY_PAGE, ['geolocation']);
      expect(await getPermission(page, 'geolocation')).toBe('granted');
    });
    itFailsFirefox('should reset permissions', async () => {
      const { page, server, context } = getTestState();

      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');
    });
    itFailsFirefox('should trigger permission onchange', async () => {
      const { page, server, context } = getTestState();

      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',
      ]);
    });
    itFailsFirefox(
      'should isolate permissions between browser contexs',
      async () => {
        const { page, server, context, browser } = getTestState();

        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('Page.setGeolocation', function () {
    itFailsFirefox('should work', async () => {
      const { page, server, context } = getTestState();

      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 () => {
      const { page } = getTestState();

      let error = null;
      try {
        await page.setGeolocation({ longitude: 200, latitude: 10 });
      } catch (error_) {
        error = error_;
      }
      expect(error.message).toContain('Invalid longitude "200"');
    });
  });

  describeFailsFirefox('Page.setOfflineMode', function () {
    it('should work', async () => {
      const { page, server } = getTestState();

      await page.setOfflineMode(true);
      let error = null;
      await page.goto(server.EMPTY_PAGE).catch((error_) => (error = error_));
      expect(error).toBeTruthy();
      await page.setOfflineMode(false);
      const response = await page.reload();
      expect(response.status()).toBe(200);
    });
    it('should emulate navigator.onLine', async () => {
      const { page } = getTestState();

      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('ExecutionContext.queryObjects', function () {
    itFailsFirefox('should work', async () => {
      const { page } = getTestState();

      // 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']);
    });
    itFailsFirefox('should work for non-blank page', async () => {
      const { page, server } = getTestState();

      // 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 () => {
      const { page } = getTestState();

      const prototypeHandle = await page.evaluateHandle(
        () => HTMLBodyElement.prototype
      );
      await prototypeHandle.dispose();
      let error = null;
      await page
        .queryObjects(prototypeHandle)
        .catch((error_) => (error = error_));
      expect(error.message).toBe('Prototype JSHandle is disposed!');
    });
    it('should fail primitive values as prototypes', async () => {
      const { page } = getTestState();

      const prototypeHandle = await page.evaluateHandle(() => 42);
      let error = null;
      await page
        .queryObjects(prototypeHandle)
        .catch((error_) => (error = error_));
      expect(error.message).toBe(
        'Prototype JSHandle must not be referencing primitive value'
      );
    });
  });

  describeFailsFirefox('Page.Events.Console', function () {
    it('should work', async () => {
      const { page } = getTestState();

      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 () => {
      const { page } = getTestState();

      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 () => {
      const { page } = getTestState();

      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 () => {
      const { page, server, isChrome } = getTestState();

      await page.goto('about:blank');
      const [message] = await Promise.all([
        waitEvent(page, 'console'),
        page.evaluate(
          async (url) => fetch(url).catch((error) => {}),
          server.EMPTY_PAGE
        ),
      ]);
      expect(message.text()).toContain('Access-Control-Allow-Origin');
      if (isChrome) expect(message.type()).toEqual('error');
      else expect(message.type()).toEqual('warn');
    });
    it('should have location when fetch fails', async () => {
      const { page, server } = getTestState();

      // 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 () => {
      const { page, server, isChrome } = getTestState();

      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: isChrome ? 14 : 6, // console.|log vs |console.log
      });
    });
    // @see https://github.com/puppeteer/puppeteer/issues/3865
    it('should not throw when there are console messages in detached iframes', async () => {
      const { page, server } = getTestState();

      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 () => {
      const { page } = getTestState();

      page.goto('about:blank');
      await waitEvent(page, 'domcontentloaded');
    });
  });

  describeFailsFirefox('Page.metrics', function () {
    it('should get metrics from a page', async () => {
      const { page } = getTestState();

      await page.goto('about:blank');
      const metrics = await page.metrics();
      checkMetrics(metrics);
    });
    it('metrics event fired on console.timeStamp', async () => {
      const { page } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, puppeteer } = getTestState();

      let error = null;
      await page
        .waitForRequest(() => false, { timeout: 1 })
        .catch((error_) => (error = error_));
      expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
    });
    it('should respect default timeout', async () => {
      const { page, puppeteer } = getTestState();

      let error = null;
      page.setDefaultTimeout(1);
      await page
        .waitForRequest(() => false)
        .catch((error_) => (error = error_));
      expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
    });
    it('should work with no timeout', async () => {
      const { page, server } = getTestState();

      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 () {
    itFailsFirefox('should work', async () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, puppeteer } = getTestState();

      let error = null;
      await page
        .waitForResponse(() => false, { timeout: 1 })
        .catch((error_) => (error = error_));
      expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
    });
    it('should respect default timeout', async () => {
      const { page, puppeteer } = getTestState();

      let error = null;
      page.setDefaultTimeout(1);
      await page
        .waitForResponse(() => false)
        .catch((error_) => (error = error_));
      expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
    });
    itFailsFirefox('should work with predicate', async () => {
      const { page, server } = getTestState();

      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');
    });
    itFailsFirefox('should work with no timeout', async () => {
      const { page, server } = getTestState();

      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');
    });
  });

  describeFailsFirefox('Page.exposeFunction', function () {
    it('should work', async () => {
      const { page } = getTestState();

      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 () => {
      const { page } = getTestState();

      await page.exposeFunction('woof', function () {
        throw new Error('WOOF WOOF');
      });
      const { message, stack } = await page.evaluate(async () => {
        try {
          await woof();
        } catch (error) {
          return { message: error.message, stack: error.stack };
        }
      });
      expect(message).toBe('WOOF WOOF');
      expect(stack).toContain(__filename);
    });
    it('should support throwing "null"', async () => {
      const { page } = getTestState();

      await page.exposeFunction('woof', function () {
        throw null;
      });
      const thrown = await page.evaluate(async () => {
        try {
          await woof();
        } catch (error) {
          return error;
        }
      });
      expect(thrown).toBe(null);
    });
    it('should be callable from-inside evaluateOnNewDocument', async () => {
      const { page } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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);
    });
    it('should work with complex objects', async () => {
      const { page } = getTestState();

      await page.exposeFunction('complexObject', function (a, b) {
        return { x: a.x + b.x };
      });
      const result = await page.evaluate(async () =>
        complexObject({ x: 5 }, { x: 2 })
      );
      expect(result.x).toBe(7);
    });
  });

  describeFailsFirefox('Page.Events.PageError', function () {
    it('should fire', async () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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');
    });
    itFailsFirefox('should work for subframes', async () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server, puppeteer } = getTestState();

      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'
      );
    });
  });

  describeFailsFirefox('Page.setContent', function () {
    const expectedOutput =
      '<html><head></head><body><div>hello</div></body></html>';
    it('should work', async () => {
      const { page } = getTestState();

      await page.setContent('<div>hello</div>');
      const result = await page.content();
      expect(result).toBe(expectedOutput);
    });
    it('should work with doctype', async () => {
      const { page } = getTestState();

      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 () => {
      const { page } = getTestState();

      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('should respect timeout', async () => {
      const { page, server, puppeteer } = getTestState();

      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((error_) => (error = error_));
      expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
    });
    it('should respect default navigation timeout', async () => {
      const { page, server, puppeteer } = getTestState();

      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((error_) => (error = error_));
      expect(error).toBeInstanceOf(puppeteer.errors.TimeoutError);
    });
    it('should await resources to load', async () => {
      const { page, server } = getTestState();

      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 () => {
      const { page } = getTestState();

      for (let i = 0; i < 20; ++i) await page.setContent('<div>yo</div>');
    });
    it('should work with tricky content', async () => {
      const { page } = getTestState();

      await page.setContent('<div>hello world</div>' + '\x7F');
      expect(await page.$eval('div', (div) => div.textContent)).toBe(
        'hello world'
      );
    });
    it('should work with accents', async () => {
      const { page } = getTestState();

      await page.setContent('<div>aberración</div>');
      expect(await page.$eval('div', (div) => div.textContent)).toBe(
        'aberración'
      );
    });
    it('should work with emojis', async () => {
      const { page } = getTestState();

      await page.setContent('<div>🐥</div>');
      expect(await page.$eval('div', (div) => div.textContent)).toBe('🐥');
    });
    it('should work with newline', async () => {
      const { page } = getTestState();

      await page.setContent('<div>\n</div>');
      expect(await page.$eval('div', (div) => div.textContent)).toBe('\n');
    });
  });

  describeFailsFirefox('Page.setBypassCSP', function () {
    it('should bypass CSP meta tag', async () => {
      const { page, server } = getTestState();

      // Make sure CSP prohibits addScriptTag.
      await page.goto(server.PREFIX + '/csp.html');
      await page
        .addScriptTag({ content: 'window.__injected = 42;' })
        .catch((error) => void error);
      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 () => {
      const { page, server } = getTestState();

      // 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((error) => void error);
      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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((error) => void error);
        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((error) => void error);
        expect(await frame.evaluate(() => window.__injected)).toBe(42);
      }
    });
  });

  describe('Page.addScriptTag', function () {
    it('should throw an error if no options are provided', async () => {
      const { page } = getTestState();

      let error = null;
      try {
        await page.addScriptTag('/injectedfile.js');
      } catch (error_) {
        error = error_;
      }
      expect(error.message).toBe(
        'Provide an object with a `url`, `path` or `content` property'
      );
    });

    it('should work with a url', async () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      await page.goto(server.EMPTY_PAGE);
      let error = null;
      try {
        await page.addScriptTag({ url: '/nonexistfile.js' });
      } catch (error_) {
        error = error_;
      }
      expect(error.message).toBe('Loading script from /nonexistfile.js failed');
    });

    it('should work with a path', async () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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);
    });

    // @see https://github.com/puppeteer/puppeteer/issues/4840
    xit('should throw when added with content to the CSP page', async () => {
      const { page, server } = getTestState();

      await page.goto(server.PREFIX + '/csp.html');
      let error = null;
      await page
        .addScriptTag({ content: 'window.__injected = 35;' })
        .catch((error_) => (error = error_));
      expect(error).toBeTruthy();
    });

    it('should throw when added with URL to the CSP page', async () => {
      const { page, server } = getTestState();

      await page.goto(server.PREFIX + '/csp.html');
      let error = null;
      await page
        .addScriptTag({ url: server.CROSS_PROCESS_PREFIX + '/injectedfile.js' })
        .catch((error_) => (error = error_));
      expect(error).toBeTruthy();
    });
  });

  describe('Page.addStyleTag', function () {
    it('should throw an error if no options are provided', async () => {
      const { page } = getTestState();

      let error = null;
      try {
        await page.addStyleTag('/injectedstyle.css');
      } catch (error_) {
        error = error_;
      }
      expect(error.message).toBe(
        'Provide an object with a `url`, `path` or `content` property'
      );
    });

    it('should work with a url', async () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      await page.goto(server.EMPTY_PAGE);
      let error = null;
      try {
        await page.addStyleTag({ url: '/nonexistfile.js' });
      } catch (error_) {
        error = error_;
      }
      expect(error.message).toBe('Loading style from /nonexistfile.js failed');
    });

    it('should work with a path', async () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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'));
    });

    itFailsFirefox('should work with content', async () => {
      const { page, server } = getTestState();

      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)');
    });

    itFailsFirefox(
      'should throw when added with content to the CSP page',
      async () => {
        const { page, server } = getTestState();

        await page.goto(server.PREFIX + '/csp.html');
        let error = null;
        await page
          .addStyleTag({ content: 'body { background-color: green; }' })
          .catch((error_) => (error = error_));
        expect(error).toBeTruthy();
      }
    );

    it('should throw when added with URL to the CSP page', async () => {
      const { page, server } = getTestState();

      await page.goto(server.PREFIX + '/csp.html');
      let error = null;
      await page
        .addStyleTag({
          url: server.CROSS_PROCESS_PREFIX + '/injectedstyle.css',
        })
        .catch((error_) => (error = error_));
      expect(error).toBeTruthy();
    });
  });

  describe('Page.url', function () {
    it('should work', async () => {
      const { page, server } = getTestState();

      expect(page.url()).toBe('about:blank');
      await page.goto(server.EMPTY_PAGE);
      expect(page.url()).toBe(server.EMPTY_PAGE);
    });
  });

  describeFailsFirefox('Page.setJavaScriptEnabled', function () {
    it('should work', async () => {
      const { page } = getTestState();

      await page.setJavaScriptEnabled(false);
      await page.goto(
        'data:text/html, <script>var something = "forbidden"</script>'
      );
      let error = null;
      await page.evaluate('something').catch((error_) => (error = error_));
      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 () => {
      const { page, server } = getTestState();

      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);
    });
    itFailsFirefox(
      'should stay disabled when toggling request interception on/off',
      async () => {
        const { page, server } = getTestState();

        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);
      }
    );
  });

  describe('printing to PDF', function () {
    itFailsFirefox('can print to PDF and save to file', async () => {
      // Printing to pdf is currently only supported in headless
      const { isHeadless, page } = getTestState();

      if (!isHeadless) return;

      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 () => {
      const { page, server } = getTestState();

      await page.goto(server.PREFIX + '/title.html');
      expect(await page.title()).toBe('Woof-Woof');
    });
  });

  describe('Page.select', function () {
    it('should select single option', async () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 not throw when select causes navigation', async () => {
      const { page, server } = getTestState();

      await page.goto(server.PREFIX + '/input/select.html');
      await page.$eval('select', (select) =>
        select.addEventListener(
          'input',
          () => (window.location = '/empty.html')
        )
      );
      await Promise.all([
        page.select('select', 'blue'),
        page.waitForNavigation(),
      ]);
      expect(page.url()).toContain('empty.html');
    });
    it('should select multiple options', async () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      let error = null;
      await page.goto(server.PREFIX + '/input/select.html');
      await page.select('body', '').catch((error_) => (error = error_));
      expect(error.message).toContain('Element is not a <select> element.');
    });
    it('should return [] on no matched values', async () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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 () => {
      const { page, server } = getTestState();

      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);
    });
    itFailsFirefox('should throw if passed in non-strings', async () => {
      const { page } = getTestState();

      await page.setContent('<select><option value="12"/></select>');
      let error = null;
      try {
        await page.select('select', 12);
      } catch (error_) {
        error = error_;
      }
      expect(error.message).toContain('Values must be strings');
    });
    // @see https://github.com/puppeteer/puppeteer/issues/3327
    itFailsFirefox(
      'should work when re-defining top-level Event class',
      async () => {
        const { page, server } = getTestState();

        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 () {
    itFailsFirefox('should work with window.close', async () => {
      const { page, context } = getTestState();

      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 () => {
      const { context } = getTestState();

      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 () => {
      const { page, browser } = getTestState();

      expect(page.browser()).toBe(browser);
    });
  });

  describe('Page.browserContext', function () {
    it('should return the correct browser instance', async () => {
      const { page, context } = getTestState();

      expect(page.browserContext()).toBe(context);
    });
  });
});