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How to use handleTopLevel method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactDOMEventListener-test.js

1/**2 * Copyright 2013-present, Facebook, Inc.3 * All rights reserved.4 *5 * This source code is licensed under the BSD-style license found in the6 * LICENSE file in the root directory of this source tree. An additional grant7 * of patent rights can be found in the PATENTS file in the same directory.8 *9 * @emails react-core10 */11'use strict';12var EVENT_TARGET_PARAM = 1;13describe('ReactDOMEventListener', () => {14  var React;15  var ReactDOM;16  var ReactDOMComponentTree;17  var ReactDOMEventListener;18  var ReactTestUtils;19  var handleTopLevel;20  beforeEach(() => {21    jest.resetModules();22    React = require('react');23    ReactDOM = require('react-dom');24    // TODO: can we express this test with only public API?25    ReactDOMComponentTree = require('ReactDOMComponentTree');26    ReactDOMEventListener = require('ReactDOMEventListener');27    ReactTestUtils = require('react-dom/test-utils');28    handleTopLevel = jest.fn();29    ReactDOMEventListener._handleTopLevel = handleTopLevel;30  });31  it('should dispatch events from outside React tree', () => {32    var otherNode = document.createElement('h1');33    var component = ReactDOM.render(<div />, document.createElement('div'));34    expect(handleTopLevel.mock.calls.length).toBe(0);35    ReactDOMEventListener.dispatchEvent('topMouseOut', {36      type: 'mouseout',37      fromElement: otherNode,38      target: otherNode,39      srcElement: otherNode,40      toElement: ReactDOM.findDOMNode(component),41      relatedTarget: ReactDOM.findDOMNode(component),42      view: window,43      path: [otherNode, otherNode],44    });45    expect(handleTopLevel.mock.calls.length).toBe(1);46  });47  describe('Propagation', () => {48    it('should propagate events one level down', () => {49      var childContainer = document.createElement('div');50      var childControl = <div>Child</div>;51      var parentContainer = document.createElement('div');52      var parentControl = <div>Parent</div>;53      childControl = ReactDOM.render(childControl, childContainer);54      parentControl = ReactDOM.render(parentControl, parentContainer);55      ReactDOM.findDOMNode(parentControl).appendChild(childContainer);56      var callback = ReactDOMEventListener.dispatchEvent.bind(null, 'test');57      callback({58        target: ReactDOM.findDOMNode(childControl),59      });60      var calls = handleTopLevel.mock.calls;61      expect(calls.length).toBe(2);62      expect(calls[0][EVENT_TARGET_PARAM]).toBe(63        ReactDOMComponentTree.getInstanceFromNode(childControl),64      );65      expect(calls[1][EVENT_TARGET_PARAM]).toBe(66        ReactDOMComponentTree.getInstanceFromNode(parentControl),67      );68    });69    it('should propagate events two levels down', () => {70      var childContainer = document.createElement('div');71      var childControl = <div>Child</div>;72      var parentContainer = document.createElement('div');73      var parentControl = <div>Parent</div>;74      var grandParentContainer = document.createElement('div');75      var grandParentControl = <div>Parent</div>;76      childControl = ReactDOM.render(childControl, childContainer);77      parentControl = ReactDOM.render(parentControl, parentContainer);78      grandParentControl = ReactDOM.render(79        grandParentControl,80        grandParentContainer,81      );82      ReactDOM.findDOMNode(parentControl).appendChild(childContainer);83      ReactDOM.findDOMNode(grandParentControl).appendChild(parentContainer);84      var callback = ReactDOMEventListener.dispatchEvent.bind(null, 'test');85      callback({86        target: ReactDOM.findDOMNode(childControl),87      });88      var calls = handleTopLevel.mock.calls;89      expect(calls.length).toBe(3);90      expect(calls[0][EVENT_TARGET_PARAM]).toBe(91        ReactDOMComponentTree.getInstanceFromNode(childControl),92      );93      expect(calls[1][EVENT_TARGET_PARAM]).toBe(94        ReactDOMComponentTree.getInstanceFromNode(parentControl),95      );96      expect(calls[2][EVENT_TARGET_PARAM]).toBe(97        ReactDOMComponentTree.getInstanceFromNode(grandParentControl),98      );99    });100    it('should not get confused by disappearing elements', () => {101      var childContainer = document.createElement('div');102      var childControl = <div>Child</div>;103      var parentContainer = document.createElement('div');104      var parentControl = <div>Parent</div>;105      childControl = ReactDOM.render(childControl, childContainer);106      parentControl = ReactDOM.render(parentControl, parentContainer);107      ReactDOM.findDOMNode(parentControl).appendChild(childContainer);108      // ReactBrowserEventEmitter.handleTopLevel might remove the109      // target from the DOM. Here, we have handleTopLevel remove the110      // node when the first event handlers are called; we'll still111      // expect to receive a second call for the parent control.112      var childNode = ReactDOM.findDOMNode(childControl);113      handleTopLevel.mockImplementation(function(114        topLevelType,115        topLevelTarget,116        topLevelTargetID,117        nativeEvent,118      ) {119        if (topLevelTarget === childNode) {120          ReactDOM.unmountComponentAtNode(childContainer);121        }122      });123      var callback = ReactDOMEventListener.dispatchEvent.bind(null, 'test');124      callback({125        target: childNode,126      });127      var calls = handleTopLevel.mock.calls;128      expect(calls.length).toBe(2);129      expect(calls[0][EVENT_TARGET_PARAM]).toBe(130        ReactDOMComponentTree.getInstanceFromNode(childNode),131      );132      expect(calls[1][EVENT_TARGET_PARAM]).toBe(133        ReactDOMComponentTree.getInstanceFromNode(parentControl),134      );135    });136    it('should batch between handlers from different roots', () => {137      var childContainer = document.createElement('div');138      var parentContainer = document.createElement('div');139      var childControl = ReactDOM.render(<div>Child</div>, childContainer);140      var parentControl = ReactDOM.render(<div>Parent</div>, parentContainer);141      ReactDOM.findDOMNode(parentControl).appendChild(childContainer);142      // Suppose an event handler in each root enqueues an update to the143      // childControl element -- the two updates should get batched together.144      var childNode = ReactDOM.findDOMNode(childControl);145      handleTopLevel.mockImplementation(function(146        topLevelType,147        topLevelTarget,148        topLevelTargetID,149        nativeEvent,150      ) {151        ReactDOM.render(152          <div>{topLevelTarget === childNode ? '1' : '2'}</div>,153          childContainer,154        );155        // Since we're batching, neither update should yet have gone through.156        expect(childNode.textContent).toBe('Child');157      });158      var callback = ReactDOMEventListener.dispatchEvent.bind(159        ReactDOMEventListener,160        'test',161      );162      callback({163        target: childNode,164      });165      var calls = handleTopLevel.mock.calls;166      expect(calls.length).toBe(2);167      expect(childNode.textContent).toBe('2');168    });169  });170  it('should not fire duplicate events for a React DOM tree', () => {171    class Wrapper extends React.Component {172      getInner = () => {173        return this.refs.inner;174      };175      render() {176        var inner = <div ref="inner">Inner</div>;177        return <div><div id="outer">{inner}</div></div>;178      }179    }180    var instance = ReactTestUtils.renderIntoDocument(<Wrapper />);181    var callback = ReactDOMEventListener.dispatchEvent.bind(null, 'test');182    callback({183      target: ReactDOM.findDOMNode(instance.getInner()),184    });185    var calls = handleTopLevel.mock.calls;186    expect(calls.length).toBe(1);187    expect(calls[0][EVENT_TARGET_PARAM]).toBe(188      ReactDOMComponentTree.getInstanceFromNode(instance.getInner()),189    );190  });...

ReactEventListener-test.js

Source: ReactEventListener-test.js

1/**2 * Copyright 2013-present, Facebook, Inc.3 * All rights reserved.4 *5 * This source code is licensed under the BSD-style license found in the6 * LICENSE file in the root directory of this source tree. An additional grant7 * of patent rights can be found in the PATENTS file in the same directory.8 *9 * @emails react-core10 */11'use strict';12var EVENT_TARGET_PARAM = 1;13describe('ReactEventListener', () => {14  var React;15  var ReactDOM;16  var ReactDOMComponentTree;17  var ReactEventListener;18  var ReactTestUtils;19  var handleTopLevel;20  beforeEach(() => {21    jest.resetModules();22    React = require('React');23    ReactDOM = require('ReactDOM');24    ReactDOMComponentTree = require('ReactDOMComponentTree');25    ReactEventListener = require('ReactEventListener');26    ReactTestUtils = require('ReactTestUtils');27    handleTopLevel = jest.fn();28    ReactEventListener._handleTopLevel = handleTopLevel;29  });30  it('should dispatch events from outside React tree', () => {31    var otherNode = document.createElement('h1');32    var component = ReactDOM.render(<div />, document.createElement('div'));33    expect(handleTopLevel.mock.calls.length).toBe(0);34    ReactEventListener.dispatchEvent(35      'topMouseOut',36      {37        type: 'mouseout',38        fromElement: otherNode,39        target: otherNode,40        srcElement: otherNode,41        toElement: ReactDOM.findDOMNode(component),42        relatedTarget: ReactDOM.findDOMNode(component),43        view: window,44        path: [otherNode, otherNode],45      },46    );47    expect(handleTopLevel.mock.calls.length).toBe(1);48  });49  describe('Propagation', () => {50    it('should propagate events one level down', () => {51      var childContainer = document.createElement('div');52      var childControl = <div>Child</div>;53      var parentContainer = document.createElement('div');54      var parentControl = <div>Parent</div>;55      childControl = ReactDOM.render(childControl, childContainer);56      parentControl =57        ReactDOM.render(parentControl, parentContainer);58      ReactDOM.findDOMNode(parentControl).appendChild(childContainer);59      var callback = ReactEventListener.dispatchEvent.bind(null, 'test');60      callback({61        target: ReactDOM.findDOMNode(childControl),62      });63      var calls = handleTopLevel.mock.calls;64      expect(calls.length).toBe(2);65      expect(calls[0][EVENT_TARGET_PARAM])66        .toBe(ReactDOMComponentTree.getInstanceFromNode(childControl));67      expect(calls[1][EVENT_TARGET_PARAM])68        .toBe(ReactDOMComponentTree.getInstanceFromNode(parentControl));69    });70    it('should propagate events two levels down', () => {71      var childContainer = document.createElement('div');72      var childControl = <div>Child</div>;73      var parentContainer = document.createElement('div');74      var parentControl = <div>Parent</div>;75      var grandParentContainer = document.createElement('div');76      var grandParentControl = <div>Parent</div>;77      childControl = ReactDOM.render(childControl, childContainer);78      parentControl =79        ReactDOM.render(parentControl, parentContainer);80      grandParentControl =81        ReactDOM.render(grandParentControl, grandParentContainer);82      ReactDOM.findDOMNode(parentControl).appendChild(childContainer);83      ReactDOM.findDOMNode(grandParentControl).appendChild(parentContainer);84      var callback = ReactEventListener.dispatchEvent.bind(null, 'test');85      callback({86        target: ReactDOM.findDOMNode(childControl),87      });88      var calls = handleTopLevel.mock.calls;89      expect(calls.length).toBe(3);90      expect(calls[0][EVENT_TARGET_PARAM])91        .toBe(ReactDOMComponentTree.getInstanceFromNode(childControl));92      expect(calls[1][EVENT_TARGET_PARAM])93        .toBe(ReactDOMComponentTree.getInstanceFromNode(parentControl));94      expect(calls[2][EVENT_TARGET_PARAM])95        .toBe(ReactDOMComponentTree.getInstanceFromNode(grandParentControl));96    });97    it('should not get confused by disappearing elements', () => {98      var childContainer = document.createElement('div');99      var childControl = <div>Child</div>;100      var parentContainer = document.createElement('div');101      var parentControl = <div>Parent</div>;102      childControl = ReactDOM.render(childControl, childContainer);103      parentControl =104        ReactDOM.render(parentControl, parentContainer);105      ReactDOM.findDOMNode(parentControl).appendChild(childContainer);106      // ReactBrowserEventEmitter.handleTopLevel might remove the107      // target from the DOM. Here, we have handleTopLevel remove the108      // node when the first event handlers are called; we'll still109      // expect to receive a second call for the parent control.110      var childNode = ReactDOM.findDOMNode(childControl);111      handleTopLevel.mockImplementation(112        function(topLevelType, topLevelTarget, topLevelTargetID, nativeEvent) {113          if (topLevelTarget === childNode) {114            ReactDOM.unmountComponentAtNode(childContainer);115          }116        }117      );118      var callback = ReactEventListener.dispatchEvent.bind(null, 'test');119      callback({120        target: childNode,121      });122      var calls = handleTopLevel.mock.calls;123      expect(calls.length).toBe(2);124      expect(calls[0][EVENT_TARGET_PARAM])125        .toBe(ReactDOMComponentTree.getInstanceFromNode(childNode));126      expect(calls[1][EVENT_TARGET_PARAM])127        .toBe(ReactDOMComponentTree.getInstanceFromNode(parentControl));128    });129    it('should batch between handlers from different roots', () => {130      var childContainer = document.createElement('div');131      var parentContainer = document.createElement('div');132      var childControl = ReactDOM.render(133        <div>Child</div>,134        childContainer135      );136      var parentControl = ReactDOM.render(137        <div>Parent</div>,138        parentContainer139      );140      ReactDOM.findDOMNode(parentControl).appendChild(childContainer);141      // Suppose an event handler in each root enqueues an update to the142      // childControl element -- the two updates should get batched together.143      var childNode = ReactDOM.findDOMNode(childControl);144      handleTopLevel.mockImplementation(145        function(topLevelType, topLevelTarget, topLevelTargetID, nativeEvent) {146          ReactDOM.render(147            <div>{topLevelTarget === childNode ? '1' : '2'}</div>,148            childContainer149          );150          // Since we're batching, neither update should yet have gone through.151          expect(childNode.textContent).toBe('Child');152        }153      );154      var callback =155        ReactEventListener.dispatchEvent.bind(ReactEventListener, 'test');156      callback({157        target: childNode,158      });159      var calls = handleTopLevel.mock.calls;160      expect(calls.length).toBe(2);161      expect(childNode.textContent).toBe('2');162    });163  });164  it('should not fire duplicate events for a React DOM tree', () => {165    class Wrapper extends React.Component {166      getInner = () => {167        return this.refs.inner;168      };169      render() {170        var inner = <div ref="inner">Inner</div>;171        return <div><div id="outer">{inner}</div></div>;172      }173    }174    var instance = ReactTestUtils.renderIntoDocument(<Wrapper />);175    var callback = ReactEventListener.dispatchEvent.bind(null, 'test');176    callback({177      target: ReactDOM.findDOMNode(instance.getInner()),178    });179    var calls = handleTopLevel.mock.calls;180    expect(calls.length).toBe(1);181    expect(calls[0][EVENT_TARGET_PARAM])182      .toBe(ReactDOMComponentTree.getInstanceFromNode(instance.getInner()));183  });...

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  await page.screenshot({ path: 'example.png' });6  await browser.close();7})();8import { Page } from '../page';9import { assert } from '../helper';10import { Keyboard, KeyInput, KeyDefinition, KeyDefinitions, KeyboardModifier, KeyboardLayout } from '../types';11import { ModifierBit } from './input';12import { debugError } from '../utils/debug';13export class KeyboardImpl implements Keyboard {14  private _page: Page;15  private _modifiers: number = 0;16  private _pressedKeys: Set<string> = new Set();17  private _layout: KeyboardLayout;18  constructor(page: Page, layout?: KeyboardLayout) {19    this._page = page;20    this._layout = layout || { ...USKeyboardLayout };21  }22  async down(key: string, options: { text?: string } = {}): Promise<void> {23    await this._page._delegate.handleTopLevel(async (page) => {24      const keyDef = this._resolveKey(key);25      const autoRepeat = this._pressedKeys.has(keyDef.code);26      this._pressedKeys.add(keyDef.code);27      this._modifiers |= keyDef.modifiers;28      await page._delegate.handleKeyboard({29      });30    });31  }32  async up(key: string): Promise<void> {33    await this._page._delegate.handleTopLevel(async (page) => {34      const keyDef = this._resolveKey(key);35      this._pressedKeys.delete(keyDef.code);36      this._modifiers &= ~keyDef.modifiers;37      await page._delegate.handleKeyboard({38      });39    });40  }

Using AI Code Generation

1const { handleTopLevel } = require('playwright/lib/server/supplements/recorder/recorderSupplement');2const { recorderSupplement } = require('playwright/lib/server/supplements/recorder/recorderSupplement');3const { Page } = require('playwright/lib/server/page');4const { Frame } = require('playwright/lib/server/frames');5const { ElementHandle } = require('playwright/lib/server/dom');6const { JSHandle } = require('playwright/lib/server/jsHandle');7const { serializeResult } = require('playwright/lib/server/serializers');8const { helper } = require('playwright/lib/helper');9const { assert } = require('playwright/lib/helper');10const { debugLogger } = require('playwright/lib/utils/debugLogger');11const { debugError } = require('playwright/lib/utils/debugLogger');12const { debug } = require('playwright/lib/utils/debugLogger');13const { debugProtocol } = require('playwright/lib/utils/debugLogger');14const { debugServer } = require('playwright/lib/utils/debugLogger');15const { debugLog } = require('playwright/lib/utils/debugLogger');16const { debugAssert } = require('playwright/lib/utils/debugLogger');17const { debugErrorLog } = require('playwright/lib/utils/debugLogger');18const { debugErrorLogOnce } = require('playwright/lib/utils/debugLogger');19const { debugLogOnce } = require('playwright/lib/utils/debugLogger');20const { debugTrace } = require('playwright/lib/utils/debugLogger');21const { debugTraceLog } = require('playwright/lib/utils/debugLogger');22const { debugTraceLogOnce } = require('playwright/lib/utils/debugLogger');23const { debugTraceLogApi } = require('playwright/lib/utils/debugLogger');24const { debugTraceLogApiOnce } = require('playwright/lib/utils/debugLogger');25const { debugTraceLogApiCall } = require('playwright/lib/utils/debugLogger');26const { debugTraceLogApiCallOnce } = require('playwright/lib/utils/debugLogger');27const { debugTraceLogApiCallResult } = require('playwright/lib/utils/debugLogger');28const { debugTraceLogApiCallResultOnce } = require('playwright/lib/utils/debugLogger');29const { debugTraceLogApiCallResultError } = require('playwright/lib/utils/debugLogger');30const { debugTraceLogApiCallResultErrorOnce } = require('playwright/lib/utils/debugLogger');31const { debug

Using AI Code Generation

1const playwright = require('playwright');2const { Internal } = require('playwright/lib/server/frames');3async function main() {4    const browser = await playwright['chromium'].launch();5    const page = await browser.newPage();6    const internal = new Internal(page);7    internal.handleTopLevel({method: 'Page.handleJavaScriptDialog', params: {type: 'alert', message: 'Hello world'}});8    await page.waitForTimeout(5000);9    await browser.close();10}11main();

Using AI Code Generation

1const { handleTopLevel } = require('playwright/lib/server/frames');2const { Frame } = require('playwright/lib/server/frames');3const { Page } = require('playwright/lib/server/page');4const { EventEmitter } = require('events');5const page = new Page(new EventEmitter());6const frame = new Frame(page, 'frameId', 'frameName', null);7const event = {8  params: {9    frame: {10    },11  },12};13handleTopLevel(frame, event);14const frame = new Frame(page, 'frameId', 'frameName', null);15const event = {16  params: {17    frame: {18    },19  },20};21handleTopLevel(frame, event);

Using AI Code Generation

1const playwright = require('playwright');2const { Internal } = require('playwright/lib/server/frames');3async function main() {4    const browser = await playwright['chromium'].launch();5    const page = await browser.newPage();6    const internal = new Internal(page);7    internal.handleTopLevel({method: 'Page.handleJavaScriptDialog', params: {type: 'alert', message: 'Hello world'}});8    await page.waitForTimeout(5000);9    await browser.close();10}11main();

Using AI Code Generation

1const { handleTopLevel } = require('playwright/lib/server/frames');2const { Frame } = require('playwright/lib/server/frames');3const { Page } = require('playwright/lib/server/page');4const { EventEmitter } = require('events');5const page = new Page(new EventEmitter());6const frame = new Frame(page, 'frameId', 'frameName', null);7const event = {8  params: {9    frame: {10    },11  },12};13handleTopLevel(frame, event);14const frame = new Frame(page, 'frameId', 'frameName', null);15const event = {16  params: {17    frame: {18    },19  },20};21handleTopLevel(frame, event);

Using AI Code Generation

1const { handleTopLevel } = require('playwright/lib/internal/handlers');2const { Page } = require('playwright/lib/page');3const { ElementHandle } = require('playwright/lib/elementHandle');4const page = new Page();5const elementHandle = new ElementHandle();6const event = {7};

Using AI Code Generation

1const { Internal } = require('playwright/lib/server/chromium/crConnection');2const { Page } = require('playwright/lib/server/chromium/crPage');3const { events } = require('playwright/lib/server/chromium/crProtocolHelper');4const page = new Page({ browser: null, context: null, opener: null, pageOrError: null, targetId: null, viewportSize: null, screencastFrameAckTimeout: null, screencastFrameRate: null, screencastQuality: null, screencastFormat: null, screencastMaxHeight: null, screencastMaxWidth: null, screencastEveryNthFrame: null, viewport: null, emulateMedia: null, deviceScaleFactor: null, isMobile: null, hasTouch: null, colorScheme: null, acceptDownloads: null, javaScriptEnabled: null, bypassCSP: null, locale: null, timezoneId: null, geolocation: null, permissions: null, extraHTTPHeaders: null, offline: null, httpCredentials: null, userAgent: null, viewportSize: null, screencastFrameAckTimeout: null, screencastFrameRate: null, screencastQuality: null, screencastFormat: null, screencastMaxHeight: null, screencastMaxWidth: null, screencastEveryNthFrame: null, viewport: null, emulateMedia: null, deviceScaleFactor: null, isMobile: null, hasTouch: null, colorScheme: null, acceptDownloads: null, javaScriptEnabled: null, bypassCSP: null, locale: null, timezoneId: null, geolocation: null, permissions: null, extraHTTPHeaders: null, offline: null, httpCredentials: null, userAgent: null, viewportSize: null, screencastFrameAckTimeout: null, screencastFrameRate: null, screencastQuality: null, screencastFormat: null, screencastMaxHeight: null, screencastMaxWidth: null, screencastEveryNthFrame: null, viewport: null, emulateMedia: null, deviceScaleFactor: null, isMobile: null, hasTouch: null, colorScheme: null, acceptDownloads: null, javaScriptEnabled: null, bypassCSP: null, locale:5const result = handleTopLevel(event);6console.log(result);

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3    const browser = await chromium.launch({ headless: false, slowMo: 1000 });4    const context = await browser.newContext();5    const page = await context.newPage();6    const response = await page._delegate.handleTopLevel(await page._delegate.mainFrame()._delegate._mainFrameSession._client.send('Page.navigate', {7    }));8    console.log(response);9    await browser.close();10})();

Using AI Code Generation

1const { Playwright } = require('playwright');2const { handleTopLevel } = Playwright._internal;3handleTopLevel(async (event) => {4  console.log(event);5});6const browser = await playwright.chromium.launch();7const page = await browser.newPage();8await browser.close();9{ method: 'Target.targetCreated',10  params: { targetInfo: { targetId: 'CD31A3C2A1F3F3A6F9D0B9B2E0D3BE3C' } } }11{ method: 'Target.targetInfoChanged',12   { targetInfo:13      { targetId: 'CD31A3C2A1F3F3A6F9D0B9B2E0D3BE3C',14        browserContexts: undefined } } }15{ method: 'Target.targetInfoChanged',16   { targetInfo:17      { targetId: 'CD31A3C2A1F3F3A6F9D0B9B2E0D3BE3C',18        browserContexts: undefined } } }19{ method: 'Target.targetInfoChanged',20   { targetInfo:21      { targetId: 'CD31A3C2A1F3F3A6F9D0B9B2E0D3BE3C',22        browserContexts: undefined } } }23{ method: '

StackOverFlow community discussions

Questions

Discussion

Running Playwright in Azure Function

How to run a list of test suites in a single file concurrently in jest?

Is it possible to get the selector from a locator object in playwright?

firefox browser does not start in playwright

Jest + Playwright - Test callbacks of event-based DOM library

I played with your example for a while and I got the same errors. These are the things I found that made my example work:

It must be Linux. I know that you mentioned that you picked a Linux plan. But I found that in VS Code that part is hidden, and on the Web the default is Windows. This is important because only the Linux plan runs npm install on the server.

Make sure that you are building on the server. You can find this option in the VS Code Settings:

Make sure you set the environment variable PLAYWRIGHT_BROWSERS_PATH, before making the publish.

https://stackoverflow.com/questions/63949978/running-playwright-in-azure-function

Assuming you are not running test with the --runinband flag, the simple answer is yes but it depends ????

There is a pretty comprehensive GitHub issue jest#6957 that explains certain cases of when tests are run concurrently or in parallel. But it seems to depend on a lot of edge cases where jest tries its best to determine the fastest way to run the tests given the circumstances.

To my knowledge there is no way to force jest to run in parallel.

Aside

Have you considered using playwright instead of puppeteer with jest? Playwright has their own internally built testing library called @playwright/test that is used in place of jest with a similar API. This library allows for explicitly defining test groups in a single file to run in parallel (i.e. test.describe.parallel) or serially (i.e. test.describe.serial). Or even to run all tests in parallel via a config option.

// parallel
test.describe.parallel('group', () => {
  test('runs in parallel 1', async ({ page }) => {});
  test('runs in parallel 2', async ({ page }) => {});
});

// serial
test.describe.serial('group', () => {
  test('runs first', async ({ page }) => {});
  test('runs second', async ({ page }) => {});
});

https://stackoverflow.com/questions/73497773/how-to-run-a-list-of-test-suites-in-a-single-file-concurrently-in-jest

Well this is one way, but not sure if it will work for all possible locators!.

// Get a selector from a playwright locator
import { Locator } from "@playwright/test";
export function extractSelector(locator: Locator) {
    const selector = locator.toString();
    const parts = selector.split("@");
    if (parts.length !== 2) { throw Error("extractSelector: susupect that this is not a locator"); }
    if (parts[0] !== "Locator") { throw Error("extractSelector: did not find locator"); }
    return parts[1];
}

https://stackoverflow.com/questions/72044959/is-it-possible-to-get-the-selector-from-a-locator-object-in-playwright

I found the error. It was because of some missing libraries need. I discovered this when I downgraded playwright to version 1.9 and ran the the code then this was the error msg:

(node:12876) UnhandledPromiseRejectionWarning: browserType.launch: Host system is missing dependencies!

Some of the Universal C Runtime files cannot be found on the system. You can fix
that by installing Microsoft Visual C++ Redistributable for Visual Studio from:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

Full list of missing libraries:
    vcruntime140.dll
    msvcp140.dll
Error
    at Object.captureStackTrace (D:\Projects\snkrs-play\node_modules\playwright\lib\utils\stackTrace.js:48:19)
    at Connection.sendMessageToServer (D:\Projects\snkrs-play\node_modules\playwright\lib\client\connection.js:69:48)
    at Proxy.<anonymous> (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:64:61)
    at D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:64:67
    at BrowserType._wrapApiCall (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:77:34)
    at BrowserType.launch (D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:55:21)
    at D:\Projects\snkrs-play\index.js:4:35
    at Object.<anonymous> (D:\Projects\snkrs-play\index.js:7:3)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:12876) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12876) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

A list of missing libraries was provided. After successful installments, firefox ran fine. I upgraded again to version 1.10 and firefox still works.

https://stackoverflow.com/questions/66984974/firefox-browser-does-not-start-in-playwright

I found the error. It was because of some missing libraries need. I discovered this when I downgraded playwright to version 1.9 and ran the the code then this was the error msg:

(node:12876) UnhandledPromiseRejectionWarning: browserType.launch: Host system is missing dependencies!

Some of the Universal C Runtime files cannot be found on the system. You can fix
that by installing Microsoft Visual C++ Redistributable for Visual Studio from:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

Full list of missing libraries:
    vcruntime140.dll
    msvcp140.dll
Error
    at Object.captureStackTrace (D:\Projects\snkrs-play\node_modules\playwright\lib\utils\stackTrace.js:48:19)
    at Connection.sendMessageToServer (D:\Projects\snkrs-play\node_modules\playwright\lib\client\connection.js:69:48)
    at Proxy.<anonymous> (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:64:61)
    at D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:64:67
    at BrowserType._wrapApiCall (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:77:34)
    at BrowserType.launch (D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:55:21)
    at D:\Projects\snkrs-play\index.js:4:35
    at Object.<anonymous> (D:\Projects\snkrs-play\index.js:7:3)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:12876) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12876) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

A list of missing libraries was provided. After successful installments, firefox ran fine. I upgraded again to version 1.10 and firefox still works.

https://stackoverflow.com/questions/66984974/firefox-browser-does-not-start-in-playwright

This question is quite close to a "need more focus" question. But let's try to give it some focus:

Does Playwright has access to the cPicker object on the page? Does it has access to the window object?

Yes, you can access both cPicker and the window object inside an evaluate call.

Should I trigger the events from the HTML file itself, and in the callbacks, print in the DOM the result, in some dummy-element, and then infer from that dummy element text that the callbacks fired?

Exactly, or you can assign values to a javascript variable:

const cPicker = new ColorPicker({
  onClickOutside(e){
  },
  onInput(color){
    window['color'] = color;
  },
  onChange(color){
    window['result'] = color;
  }
})

And then

it('Should call all callbacks with correct arguments', async() => {
    await page.goto(`http://localhost:5000/tests/visual/basic.html`, {waitUntil:'load'})

    // Wait until the next frame
    await page.evaluate(() => new Promise(requestAnimationFrame))

    // Act
   
    // Assert
    const result = await page.evaluate(() => window['color']);
    // Check the value
})

https://stackoverflow.com/questions/65477895/jest-playwright-test-callbacks-of-event-based-dom-library

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What is Playwright : Playwright is comparatively new but has gained good popularity. Get to know some history of the Playwright with some interesting facts connected with it.
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Functions and Selectors in Playwright: Learn how to launch the Chromium browser with Playwright. Also, gain a better understanding of some important functions like “BrowserContext,” which allows you to run multiple browser sessions, and “newPage” which interacts with a page.
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