/**
 * Copyright 2017 Google Inc. All rights reserved.
 * Modifications copyright (c) Microsoft Corporation.
 *
 * 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;

/**
 * @type {PageTestSuite}
 */
module.exports.describe = function({testRunner, expect, headless, playwright, FFOX, CHROMIUM, WEBKIT}) {
  const {describe, xdescribe, fdescribe} = testRunner;
  const {it, fit, xit, dit} = 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 context.pages', async({context}) => {
      const newPage = await context.newPage();
      expect(await context.pages()).toContain(newPage);
      await newPage.close();
      expect(await context.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 (CHROMIUM)
        expect(dialog.message()).toBe('');
      else if (WEBKIT)
        expect(dialog.message()).toBe('Leave?');
      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);
    });
    it.skip(FFOX)('should terminate network waiters', async({context, server}) => {
      const newPage = await context.newPage();
      const results = await Promise.all([
        newPage.waitForRequest(server.EMPTY_PAGE).catch(e => e),
        newPage.waitForResponse(server.EMPTY_PAGE).catch(e => e),
        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({page, server}) => {
      await Promise.all([
        page.goto('about:blank'),
        utils.waitEvent(page, 'load'),
      ]);
    });
  });

  describe('Async stacks', () => {
    it('should work', async({page, server}) => {
      server.setRoute('/empty.html', (req, res) => {
        req.socket.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.skip(FFOX)('Page.Events.error', function() {
    it('should throw when page crashes', async({page}) => {
      let error = null;
      page.on('error', err => error = err);
      if (CHROMIUM)
        page.goto('chrome://crash').catch(e => {});
      else if (WEBKIT)
        page._delegate._session.send('Page.crash', {}).catch(e => {});
      await waitEvent(page, 'error');
      expect(error.message).toBe('Page crashed!');
    });
  });

  describe('Page.opener', function() {
    it('should provide access to the opener page', async({page}) => {
      const [popup] = await Promise.all([
        new Promise(x => page.once('popup', x)),
        page.evaluate(() => window.open('about:blank')),
      ]);
      const opener = await popup.opener();
      expect(opener).toBe(page);
    });
    it('should return null if parent page has been closed', async({page}) => {
      const [popup] = await Promise.all([
        new Promise(x => page.once('popup', x)),
        page.evaluate(() => window.open('about:blank')),
      ]);
      await page.close();
      const opener = await popup.opener();
      expect(opener).toBe(null);
    });
  });

  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');
      expect(message.type()).toEqual('error');
    });
    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');
      const location = message.location();
      // Engines have different column notion.
      delete location.columnNumber;
      expect(location).toEqual({
        url: server.PREFIX + '/consolelog.html',
        lineNumber: 7,
      });
    });
    // @see https://github.com/GoogleChrome/puppeteer/issues/3865
    it.skip(FFOX)('should not throw when there are console messages in detached iframes', async({page, server}) => {
      await page.goto(server.EMPTY_PAGE);
      await page.evaluate(async() => {
        // 1. Create a popup that Playwright 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');
        while (window.document.readyState !== 'complete')
          await new Promise(f => setTimeout(f, 100));
        // 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');
        while (frame.contentDocument.readyState !== 'complete')
          await new Promise(f => setTimeout(f, 100));
        // 3. After that, remove the iframe.
        frame.remove();
      });
      // 4. Connect to the popup and make sure it doesn't throw.
      await page.context().pages();
    });
  });

  describe('Page.Events.DOMContentLoaded', function() {
    it('should fire when expected', async({page, server}) => {
      const navigatedPromise = page.goto('about:blank');
      await waitEvent(page, 'domcontentloaded');
      await navigatedPromise;
    });
  });

  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.waitForEvent('request', 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.waitForEvent('request', { predicate: () => false, timeout: 1 }).catch(e => error = e);
      expect(error).toBeInstanceOf(playwright.errors.TimeoutError);
    });
    it('should respect default timeout', async({page, server}) => {
      let error = null;
      page.setDefaultTimeout(1);
      await page.waitForEvent('request', () => false).catch(e => error = e);
      expect(error).toBeInstanceOf(playwright.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');
    });
    it('should work with url match', async({page, server}) => {
      await page.goto(server.EMPTY_PAGE);
      const [request] = await Promise.all([
        page.waitForRequest(/digits\/\d\.png/),
        page.evaluate(() => {
          fetch('/digits/1.png');
        })
      ]);
      expect(request.url()).toBe(server.PREFIX + '/digits/1.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.waitForEvent('response', { predicate: () => false, timeout: 1 }).catch(e => error = e);
      expect(error).toBeInstanceOf(playwright.errors.TimeoutError);
    });
    it('should respect default timeout', async({page, server}) => {
      let error = null;
      page.setDefaultTimeout(1);
      await page.waitForEvent('response', () => false).catch(e => error = e);
      expect(error).toBeInstanceOf(playwright.errors.TimeoutError);
    });
    it('should work with predicate', async({page, server}) => {
      await page.goto(server.EMPTY_PAGE);
      const [response] = await Promise.all([
        page.waitForEvent('response', 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);
    });
    it('should work after cross origin navigation', async({page, server}) => {
      await page.goto(server.EMPTY_PAGE);
      await page.exposeFunction('compute', function(a, b) {
        return a * b;
      });

      await page.goto(server.CROSS_PROCESS_PREFIX + '/empty.html');
      const result = await page.evaluate(async function() {
        return await compute(9, 4);
      });
      expect(result).toBe(36);
    });
    it('should work with complex objects', async({page, server}) => {
      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);
    });
  });

  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.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 domcontentloaded', async({page, server}) => {
      await page.setContent('<div>hello</div>', { waitUntil: 'domcontentloaded' });
      const result = await page.content();
      expect(result).toBe(expectedOutput);
    });
    it('should not confuse with previous navigation', async({page, server}) => {
      const imgPath = '/img.png';
      let imgResponse = null;
      server.setRoute(imgPath, (req, res) => imgResponse = res);
      let loaded = false;
      // get the global object to make sure that the main execution context is alive and well.
      await page.evaluate(() => this);
      // Trigger navigation which might resolve next setContent call.
      const evalPromise = page.evaluate(url => window.location.href = url, server.EMPTY_PAGE);
      const contentPromise = page.setContent(`<img src="${server.PREFIX + imgPath}"></img>`).then(() => loaded = true);
      await server.waitForRequest(imgPath);

      expect(loaded).toBe(false);
      for (let i = 0; i < 5; i++)
        await page.evaluate('1');  // Roundtrips to give setContent a chance to resolve.
      expect(loaded).toBe(false);

      imgResponse.end();
      await contentPromise;
      await evalPromise;
    });
    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('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="${server.PREFIX + imgPath}"></img>`, {timeout: 1}).catch(e => error = e);
      expect(error).toBeInstanceOf(playwright.errors.TimeoutError);
    });
    it('should respect default navigation timeout', async({page, server}) => {
      page.setDefaultNavigationTimeout(1);
      const imgPath = '/img.png';
      // stall for image
      server.setRoute(imgPath, (req, res) => {});
      let error = null;
      await page.setContent(`<img src="${server.PREFIX + imgPath}"></img>`).catch(e => error = e);
      expect(error).toBeInstanceOf(playwright.errors.TimeoutError);
    });
    it('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');
    });
    it('should work with accents', async({page, server}) => {
      await page.setContent('<div>aberración</div>');
      expect(await page.$eval('div', div => div.textContent)).toBe('aberración');
    });
    it('should work with emojis', async({page, server}) => {
      await page.setContent('<div>🐥</div>');
      expect(await page.$eval('div', div => div.textContent)).toBe('🐥');
    });
    it('should work with newline', async({page, server}) => {
      await page.setContent('<div>\n</div>');
      expect(await page.$eval('div', div => div.textContent)).toBe('\n');
    });
  });


  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).not.toBe(null);
    });

    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);
    });

    (CHROMIUM || FFOX) && it('should include sourceURL 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);
    });

    // Firefox fires onload for blocked script before it issues the CSP console error.
    it.skip(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).not.toBe(null);
    });

    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 sourceURL 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('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.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');
      // WebKit does r.setCachePolicy(ResourceRequestCachePolicy::ReloadIgnoringCacheData);
      // when navigating to the same url, load empty.html to avoid that.
      await page.goto(server.EMPTY_PAGE);
      const [cachedRequest] = await Promise.all([
        server.waitForRequest('/cached/one-style.html'),
        page.goto(server.PREFIX + '/cached/one-style.html'),
      ]);
      // Rely on "if-modified-since" caching in our test server.
      expect(cachedRequest.headers['if-modified-since']).not.toBe(undefined);

      await page.setCacheEnabled(false);
      await page.goto(server.EMPTY_PAGE);
      const [nonCachedRequest] = await Promise.all([
        server.waitForRequest('/cached/one-style.html'),
        page.goto(server.PREFIX + '/cached/one-style.html'),
      ]);
      expect(nonCachedRequest.headers['if-modified-since']).toBe(undefined);
    });
  });

  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 single option by value', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/select.html');
      await page.select('select', { value: 'blue' });
      expect(await page.evaluate(() => result.onInput)).toEqual(['blue']);
      expect(await page.evaluate(() => result.onChange)).toEqual(['blue']);
    });
    it('should select single option by label', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/select.html');
      await page.select('select', { label: 'Indigo' });
      expect(await page.evaluate(() => result.onInput)).toEqual(['indigo']);
      expect(await page.evaluate(() => result.onChange)).toEqual(['indigo']);
    });
    it('should select single option by handle', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/select.html');
      await page.select('select', await page.$('[id=whiteOption]'));
      expect(await page.evaluate(() => result.onInput)).toEqual(['white']);
      expect(await page.evaluate(() => result.onChange)).toEqual(['white']);
    });
    it('should select single option by index', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/select.html');
      await page.select('select', { index: 2 });
      expect(await page.evaluate(() => result.onInput)).toEqual(['brown']);
      expect(await page.evaluate(() => result.onChange)).toEqual(['brown']);
    });
    it('should select single option by multiple attributes', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/select.html');
      await page.select('select', { value: 'green', label: 'Green' });
      expect(await page.evaluate(() => result.onInput)).toEqual(['green']);
      expect(await page.evaluate(() => result.onChange)).toEqual(['green']);
    });
    it('should not select single option when some attributes do not match', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/select.html');
      await page.select('select', { value: 'green', label: 'Brown' });
      expect(await page.evaluate(() => document.querySelector('select').value)).toEqual('');
    });
    it('should select only first option', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/select.html');
      await page.select('select', 'blue', 'green', 'red');
      expect(await page.evaluate(() => result.onInput)).toEqual(['blue']);
      expect(await page.evaluate(() => result.onChange)).toEqual(['blue']);
    });
    it('should not throw when select causes navigation', async({page, server}) => { await page.goto(server.PREFIX + '/input/select.html');
      await page.$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({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 select multiple options with attributes', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/select.html');
      await page.evaluate(() => makeMultiple());
      await page.select('select', ['blue', { label: 'Green' }, { index: 4 }]);
      expect(await page.evaluate(() => result.onInput)).toEqual(['blue', 'gray', 'green']);
      expect(await page.evaluate(() => result.onChange)).toEqual(['blue', 'gray', 'green']);
    });
    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 wrong types', async({page, server}) => {
      let error;
      await page.setContent('<select><option value="12"/></select>');

      error = null;
      try {
        await page.select('select', 12);
      } catch (e) {
        error = e;
      }
      expect(error.message).toContain('Values must be strings');

      error = null;
      try {
        await page.select('select', { value: 12 });
      } catch (e) {
        error = e;
      }
      expect(error.message).toContain('Values must be strings');

      error = null;
      try {
        await page.select('select', { label: 12 });
      } catch (e) {
        error = e;
      }
      expect(error.message).toContain('Labels must be strings');

      error = null;
      try {
        await page.select('select', { index: '12' });
      } catch (e) {
        error = e;
      }
      expect(error.message).toContain('Indices must be numbers');
    });
    // @see https://github.com/GoogleChrome/puppeteer/issues/3327
    it('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.fill', function() {
    it('should fill textarea', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/textarea.html');
      await page.fill('textarea', 'some value');
      expect(await page.evaluate(() => result)).toBe('some value');
    });
    it('should fill input', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/textarea.html');
      await page.fill('input', 'some value');
      expect(await page.evaluate(() => result)).toBe('some value');
    });
    it('should throw on unsupported inputs', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/textarea.html');
      for (const type of ['color', 'date']) {
        await page.$eval('input', (input, type) => input.setAttribute('type', type), type);
        let error = null;
        await page.fill('input', '').catch(e => error = e);
        expect(error.message).toContain('Cannot fill input of type');
      }
    });
    it('should fill different input types', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/textarea.html');
      for (const type of ['password', 'search', 'tel', 'text', 'url']) {
        await page.$eval('input', (input, type) => input.setAttribute('type', type), type);
        await page.fill('input', 'text ' + type);
        expect(await page.evaluate(() => result)).toBe('text ' + type);
      }
    });
    it('should fill contenteditable', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/textarea.html');
      await page.fill('div[contenteditable]', 'some value');
      expect(await page.$eval('div[contenteditable]', div => div.textContent)).toBe('some value');
    });
    it('should fill elements with existing value and selection', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/textarea.html');

      await page.$eval('input', input => input.value = 'value one');
      await page.fill('input', 'another value');
      expect(await page.evaluate(() => result)).toBe('another value');

      await page.$eval('input', input => {
        input.selectionStart = 1;
        input.selectionEnd = 2;
      });
      await page.fill('input', 'maybe this one');
      expect(await page.evaluate(() => result)).toBe('maybe this one');

      await page.$eval('div[contenteditable]', div => {
        div.innerHTML = 'some text <span>some more text<span> and even more text';
        const range = document.createRange();
        range.selectNodeContents(div.querySelector('span'));
        const selection = window.getSelection();
        selection.removeAllRanges();
        selection.addRange(range);
      });
      await page.fill('div[contenteditable]', 'replace with this');
      expect(await page.$eval('div[contenteditable]', div => div.textContent)).toBe('replace with this');
    });
    it('should throw when element is not an <input>, <textarea> or [contenteditable]', async({page, server}) => {
      let error = null;
      await page.goto(server.PREFIX + '/input/textarea.html');
      await page.fill('body', '').catch(e => error = e);
      expect(error.message).toContain('Element is not an <input>');
    });
    it('should throw if passed a non-string value', async({page, server}) => {
      let error = null;
      await page.goto(server.PREFIX + '/input/textarea.html');
      await page.fill('textarea', 123).catch(e => error = e);
      expect(error.message).toContain('Value must be string.');
    });
    it('should wait for visible visibilty', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/textarea.html');
      await page.fill('input', 'some value');
      expect(await page.evaluate(() => result)).toBe('some value');

      await page.goto(server.PREFIX + '/input/textarea.html');
      await page.$eval('input', i => i.style.display = 'none');
      await Promise.all([
        page.fill('input', 'some value'),
        page.$eval('input', i => i.style.display = 'block'),
      ]);
      expect(await page.evaluate(() => result)).toBe('some value');
    });
    it('should throw on disabled and readonly elements', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/textarea.html');
      await page.$eval('input', i => i.disabled = true);
      const disabledError = await page.fill('input', 'some value').catch(e => e);
      expect(disabledError.message).toBe('Cannot fill a disabled input.');

      await page.goto(server.PREFIX + '/input/textarea.html');
      await page.$eval('textarea', i => i.readOnly = true);
      const readonlyError = await page.fill('textarea', 'some value').catch(e => e);
      expect(readonlyError.message).toBe('Cannot fill a readonly textarea.');
    });
    it('should throw on hidden and invisible elements', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/textarea.html');
      await page.$eval('input', i => i.style.display = 'none');
      const invisibleError = await page.fill('input', 'some value', { waitFor: 'nowait' }).catch(e => e);
      expect(invisibleError.message).toBe('Element is not visible');

      await page.goto(server.PREFIX + '/input/textarea.html');
      await page.$eval('input', i => i.style.visibility = 'hidden');
      const hiddenError = await page.fill('input', 'some value', { waitFor: 'nowait' }).catch(e => e);
      expect(hiddenError.message).toBe('Element is hidden');
    });
    it('should be able to fill the body', async({page}) => {
      await page.setContent(`<body contentEditable="true"></body>`);
      await page.fill('body', 'some value');
      expect(await page.evaluate(() => document.body.textContent)).toBe('some value');
    });
    it('should be able to fill when focus is in the wrong frame', async({page}) => {
      await page.setContent(`
        <div contentEditable="true"></div>
        <iframe></iframe>
      `);
      await page.focus('iframe');
      await page.fill('div', 'some value');
      expect(await page.$eval('div', d => d.textContent)).toBe('some value');
    });
    it('should be able to fill the input[type=number]', async({page}) => {
      await page.setContent(`<input id="input" type="number"></input>`);
      await page.fill('input', '42');
      expect(await page.evaluate(() => input.value)).toBe('42');
    });
    it('should be able to fill exponent into the input[type=number]', async({page}) => {
      await page.setContent(`<input id="input" type="number"></input>`);
      await page.fill('input', '-10e5');
      expect(await page.evaluate(() => input.value)).toBe('-10e5');
    });
    it('should not be able to fill input[type=number] with empty string', async({page}) => {
      await page.setContent(`<input id="input" type="number"></input>`);
      let error = null;
      await page.fill('input', '').catch(e => error = e);
      expect(error.message).toContain('Cannot type text into input[type=number].');
    });
    it('should not be able to fill text into the input[type=number]', async({page}) => {
      await page.setContent(`<input id="input" type="number"></input>`);
      let error = null;
      await page.fill('input', '').catch(e => error = e);
      expect(error.message).toContain('Cannot type text into input[type=number].');
    });
    it('should be able to clear', async({page, server}) => {
      await page.goto(server.PREFIX + '/input/textarea.html');
      await page.fill('input', 'some value');
      expect(await page.evaluate(() => result)).toBe('some value');
      await page.fill('input', '');
      expect(await page.evaluate(() => result)).toBe('');
    });
  });

  describe('Page.Events.Close', function() {
    it('should work with window.close', async function({ page, context, server }) {
      const newPagePromise = new Promise(f => page.once('popup', f));
      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.browserContext', function() {
    it('should return the correct browser instance', async function({page, context}) {
      expect(page.context()).toBe(context);
    });
  });
};