Discover AI-native insights at Testμ Conference‘25

How to use modifiersForEvent method in Playwright Internal

Best JavaScript code snippet using playwright-internal

app.js

Source:app.js

...5963    ]5964    window.addEventListener('keydown', this.handleKeyDown.bind(this));5965    window.addEventListener('keyup', this.handleKeyUp.bind(this));5966  }5967  modifiersForEvent(event) {5968    let eventModifiers = KeyboardManager.AllModifiers.filter((modifier) => {5969      // For a modifier like ctrlKey, must check both event.ctrlKey and event.key.5970      // That's because on keyup, event.ctrlKey would be false, but event.key == Control would be true.5971      let matches = (5972        ((event.ctrlKey || event.key == KeyboardManager.KeyModifierCtrl) && modifier === KeyboardManager.KeyModifierCtrl) ||5973        ((event.metaKey || event.key == KeyboardManager.KeyModifierMeta) && modifier === KeyboardManager.KeyModifierMeta) ||5974        ((event.altKey || event.key == KeyboardManager.KeyModifierAlt) && modifier === KeyboardManager.KeyModifierAlt) ||5975        ((event.shiftKey || event.key == KeyboardManager.KeyModifierShift) && modifier === KeyboardManager.KeyModifierShift)5976      )5977      return matches;5978    })5979    return eventModifiers;5980  }5981  eventMatchesKeyAndModifiers(event, key, modifiers = [])  {5982    let eventModifiers = this.modifiersForEvent(event);5983    if(eventModifiers.length != modifiers.length) {5984      return false;5985    }5986    for(let modifier of modifiers) {5987      if(!eventModifiers.includes(modifier)) {5988        return false;5989      }5990    }5991    // Modifers match, check key5992    if(!key) {5993      return true;5994    }5995    // In the browser, shift + f results in key 'f', but in Electron, shift + f results in 'F'5996    // In our case we don't differentiate between the two....

recorder.js

Source:recorder.js

...130      selector: this._hoveredModel.selector,131      position: positionForEvent(event),132      signals: [],133      button: buttonForEvent(event),134      modifiers: modifiersForEvent(event),135      clickCount: event.detail136    });137  }138  _shouldIgnoreMouseEvent(event) {139    const target = this._deepEventTarget(event);140    if (this._mode === 'none') return true;141    if (this._mode === 'inspecting') {142      consumeEvent(event);143      return true;144    }145    const nodeName = target.nodeName;146    if (nodeName === 'SELECT') return true;147    if (nodeName === 'INPUT' && ['date'].includes(target.type)) return true;148    return false;149  }150  _onMouseDown(event) {151    if (this._shouldIgnoreMouseEvent(event)) return;152    if (!this._performingAction) consumeEvent(event);153    this._activeModel = this._hoveredModel;154  }155  _onMouseUp(event) {156    if (this._shouldIgnoreMouseEvent(event)) return;157    if (!this._performingAction) consumeEvent(event);158  }159  _onMouseMove(event) {160    if (this._mode === 'none') return;161    const target = this._deepEventTarget(event);162    if (this._hoveredElement === target) return;163    this._hoveredElement = target;164    this._updateModelForHoveredElement();165  }166  _onMouseLeave(event) {167    // Leaving iframe.168    if (this._deepEventTarget(event).nodeType === Node.DOCUMENT_NODE) {169      this._hoveredElement = null;170      this._updateModelForHoveredElement();171    }172  }173  _onFocus() {174    const activeElement = this._deepActiveElement(document);175    const result = activeElement ? (0, _selectorGenerator.generateSelector)(this._injectedScript, activeElement) : null;176    this._activeModel = result && result.selector ? result : null;177    if (this._params.isUnderTest) console.error('Highlight updated for test: ' + (result ? result.selector : null));178  }179  _updateModelForHoveredElement() {180    if (!this._hoveredElement) {181      this._hoveredModel = null;182      this._updateHighlight();183      return;184    }185    const hoveredElement = this._hoveredElement;186    const {187      selector,188      elements189    } = (0, _selectorGenerator.generateSelector)(this._injectedScript, hoveredElement);190    if (this._hoveredModel && this._hoveredModel.selector === selector || this._hoveredElement !== hoveredElement) return;191    this._hoveredModel = selector ? {192      selector,193      elements194    } : null;195    this._updateHighlight();196    if (this._params.isUnderTest) console.error('Highlight updated for test: ' + selector);197  }198  _updateHighlight() {199    const elements = this._hoveredModel ? this._hoveredModel.elements : [];200    const selector = this._hoveredModel ? this._hoveredModel.selector : '';201    this._highlight.updateHighlight(elements, selector, this._mode === 'recording');202  }203  _onInput(event) {204    if (this._mode !== 'recording') return true;205    const target = this._deepEventTarget(event);206    if (['INPUT', 'TEXTAREA'].includes(target.nodeName)) {207      const inputElement = target;208      const elementType = (inputElement.type || '').toLowerCase();209      if (elementType === 'checkbox') {210        // Checkbox is handled in click, we can't let input trigger on checkbox - that would mean we dispatched click events while recording.211        return;212      }213      if (elementType === 'file') {214        globalThis._playwrightRecorderRecordAction({215          name: 'setInputFiles',216          selector: this._activeModel.selector,217          signals: [],218          files: [...(inputElement.files || [])].map(file => file.name)219        });220        return;221      } // Non-navigating actions are simply recorded by Playwright.222      if (this._consumedDueWrongTarget(event)) return;223      globalThis._playwrightRecorderRecordAction({224        name: 'fill',225        selector: this._activeModel.selector,226        signals: [],227        text: inputElement.value228      });229    }230    if (target.nodeName === 'SELECT') {231      const selectElement = target;232      if (this._actionInProgress(event)) return;233      this._performAction({234        name: 'select',235        selector: this._hoveredModel.selector,236        options: [...selectElement.selectedOptions].map(option => option.value),237        signals: []238      });239    }240  }241  _shouldGenerateKeyPressFor(event) {242    // Backspace, Delete, AltGraph are changing input, will handle it there.243    if (['Backspace', 'Delete', 'AltGraph'].includes(event.key)) return false; // Ignore the QWERTZ shortcut for creating a at sign on MacOS244    if (event.key === '@' && event.code === 'KeyL') return false; // Allow and ignore common used shortcut for pasting.245    if (navigator.platform.includes('Mac')) {246      if (event.key === 'v' && event.metaKey) return false;247    } else {248      if (event.key === 'v' && event.ctrlKey) return false;249      if (event.key === 'Insert' && event.shiftKey) return false;250    }251    if (['Shift', 'Control', 'Meta', 'Alt'].includes(event.key)) return false;252    const hasModifier = event.ctrlKey || event.altKey || event.metaKey;253    if (event.key.length === 1 && !hasModifier) return !!asCheckbox(this._deepEventTarget(event));254    return true;255  }256  _onKeyDown(event) {257    if (this._mode === 'inspecting') {258      consumeEvent(event);259      return;260    }261    if (this._mode !== 'recording') return;262    if (!this._shouldGenerateKeyPressFor(event)) return;263    if (this._actionInProgress(event)) {264      this._expectProgrammaticKeyUp = true;265      return;266    }267    if (this._consumedDueWrongTarget(event)) return; // Similarly to click, trigger checkbox on key event, not input.268    if (event.key === ' ') {269      const checkbox = asCheckbox(this._deepEventTarget(event));270      if (checkbox) {271        this._performAction({272          name: checkbox.checked ? 'uncheck' : 'check',273          selector: this._activeModel.selector,274          signals: []275        });276        return;277      }278    }279    this._performAction({280      name: 'press',281      selector: this._activeModel.selector,282      signals: [],283      key: event.key,284      modifiers: modifiersForEvent(event)285    });286  }287  _onKeyUp(event) {288    if (this._mode === 'none') return;289    if (!this._shouldGenerateKeyPressFor(event)) return; // Only allow programmatic keyups, ignore user input.290    if (!this._expectProgrammaticKeyUp) {291      consumeEvent(event);292      return;293    }294    this._expectProgrammaticKeyUp = false;295  }296  async _performAction(action) {297    this._performingAction = true;298    await globalThis._playwrightRecorderPerformAction(action).catch(() => {});299    this._performingAction = false; // Action could have changed DOM, update hovered model selectors.300    this._updateModelForHoveredElement(); // If that was a keyboard action, it similarly requires new selectors for active model.301    this._onFocus();302    if (this._params.isUnderTest) {303      // Serialize all to string as we cannot attribute console message to isolated world304      // in Firefox.305      console.error('Action performed for test: ' + JSON.stringify({306        hovered: this._hoveredModel ? this._hoveredModel.selector : null,307        active: this._activeModel ? this._activeModel.selector : null308      }));309    }310  }311  _deepEventTarget(event) {312    return event.composedPath()[0];313  }314  _deepActiveElement(document) {315    let activeElement = document.activeElement;316    while (activeElement && activeElement.shadowRoot && activeElement.shadowRoot.activeElement) activeElement = activeElement.shadowRoot.activeElement;317    return activeElement;318  }319}320exports.Recorder = Recorder;321function modifiersForEvent(event) {322  return (event.altKey ? 1 : 0) | (event.ctrlKey ? 2 : 0) | (event.metaKey ? 4 : 0) | (event.shiftKey ? 8 : 0);323}324function buttonForEvent(event) {325  switch (event.which) {326    case 1:327      return 'left';328    case 2:329      return 'middle';330    case 3:331      return 'right';332  }333  return 'left';334}335function positionForEvent(event) {...

keyinfo.js

Source:keyinfo.js

...8    static forEvent (event)9    {10        var combo, info11        combo = this.comboForEvent(event)12        info = {mod:this.modifiersForEvent(event),key:this.keynameForEvent(event),char:this.characterForEvent(event),combo:combo,short:this.short(combo)}13        return info14    }15    static modifierNames = ['shift','ctrl','alt','command']16    static modifierChars = ['â','â','â¥','â']17    static iconKeyNames = ['shift','ctrl','alt','command','backspace','delete','home','end','page up','page down','return','enter','up','down','left','right','tab','space','click']18    static iconKeyChars = ['â','â','â¥','â','â«','â¦','â','â','â','â','â©','â©','â','â','â','â','â¤ ','â£','â']19    static forCombo (combo)20    {21        var c, char, key, mods22        mods = []23        char = null24        var list = _k_.list(combo.split('+'))25        for (var _34_14_ = 0; _34_14_ < list.length; _34_14_++)26        {27            c = list[_34_14_]28            if (this.isModifier(c))29            {30                mods.push(c)31            }32            else33            {34                key = c35                if (c.length === 1)36                {37                    char = c38                }39            }40        }41        return {mod:mods.join('+'),key:key,combo:combo,char:char}42    }43    static isModifier (keyname)44    {45        return _k_.in(keyname,this.modifierNames)46    }47    static modifiersForEvent (event)48    {49        var mods50        mods = []51        if (event.metaKey || event.key === 'Meta')52        {53            mods.push('command')54        }55        if (event.altKey || event.key === 'Alt')56        {57            mods.push('alt')58        }59        if (event.ctrlKey || event.key === 'Control')60        {61            mods.push('ctrl')62        }63        if (event.shiftKey || event.key === 'Shift')64        {65            mods.push('shift')66        }67        return mods.join('+')68    }69    static comboForEvent (event)70    {71        var join, key72        join = function ()73        {74            args = [].slice.call(arguments,0)75            args = args.filter(function (e)76            {77                return (e != null ? e.length : undefined)78            })79            return args.join('+')80        }81        key = this.keynameForEvent(event)82        if (!(_k_.in(key,this.modifierNames)))83        {84            return join(this.modifiersForEvent(event),key)85        }86        return ''87    }88    static convertCmdCtrl (combo)89    {90        var index91        index = combo.indexOf('cmdctrl')92        if (index >= 0)93        {94            if (os.platform() === 'darwin')95            {96                combo = combo.replace('cmdctrl','command')97                combo = combo.replace('alt+command','command+alt')98            }...

keyboardManager.js

Source:keyboardManager.js

...20    ]21    window.addEventListener('keydown', this.handleKeyDown.bind(this));22    window.addEventListener('keyup', this.handleKeyUp.bind(this));23  }24  modifiersForEvent(event) {25    let eventModifiers = KeyboardManager.AllModifiers.filter((modifier) => {26      // For a modifier like ctrlKey, must check both event.ctrlKey and event.key.27      // That's because on keyup, event.ctrlKey would be false, but event.key == Control would be true.28      let matches = (29        ((event.ctrlKey || event.key == KeyboardManager.KeyModifierCtrl) && modifier === KeyboardManager.KeyModifierCtrl) ||30        ((event.metaKey || event.key == KeyboardManager.KeyModifierMeta) && modifier === KeyboardManager.KeyModifierMeta) ||31        ((event.altKey || event.key == KeyboardManager.KeyModifierAlt) && modifier === KeyboardManager.KeyModifierAlt) ||32        ((event.shiftKey || event.key == KeyboardManager.KeyModifierShift) && modifier === KeyboardManager.KeyModifierShift)33      )34      return matches;35    })36    return eventModifiers;37  }38  eventMatchesKeyAndModifiers(event, key, modifiers = [])  {39    let eventModifiers = this.modifiersForEvent(event);40    if(eventModifiers.length != modifiers.length) {41      return false;42    }43    for(let modifier of modifiers) {44      if(!eventModifiers.includes(modifier)) {45        return false;46      }47    }48    // Modifers match, check key49    if(!key) {50      return true;51    }52    // In the browser, shift + f results in key 'f', but in Electron, shift + f results in 'F'53    // In our case we don't differentiate between the two....

Using AI Code Generation

1const { chromium, webkit, firefox } = require('playwright');2(async () => {3  const browser = await chromium.launch({4  });5  const context = await browser.newContext();6  const page = await context.newPage();7  await page.click('text=Get started');8  await page.click('

Using AI Code Generation

1const { modifiersForEvent } = require('playwright/lib/server/keyboard');2const modifiers = modifiersForEvent({ altKey: true, shiftKey: true, ctrlKey: true, metaKey: true });3console.log(modifiers);4const { modifiersForEvent } = require('playwright/lib/server/keyboard');5const modifiers = modifiersForEvent({ altKey: true, shiftKey: true, ctrlKey: true, metaKey: true });6console.log(modifiers);

Using AI Code Generation

1const { InternalAPIs } = require('@playwright/test/lib/server/frames');2const { Page } = require('@playwright/test/lib/server/page');3const { Frame } = require('@playwright/test/lib/server/frame');4const { ElementHandle } = require('@playwright/test/lib/server/dom');5const { Modifier } = require('@playwright/test/lib/server/input');6const page = await browser.newPage();7const frame = page.mainFrame();8const element = await frame.$('button');9const modifiers = InternalAPIs.modifiersForEvent(Modifier.Meta, Modifier.Shift);10await element.dispatchEvent('click', { modifiers: modifiers });11const modifiers = InternalAPIs.modifiersForEvent(Modifier.Meta | Modifier.Shift);12await element.dispatchEvent('click', { modifiers: modifiers });13const modifiers = InternalAPIs.modifiersForEvent(Modifier.Meta, Modifier.Shift, Modifier.Alt);14await element.dispatchEvent('click', { modifiers: modifiers });15const modifiers = InternalAPIs.modifiersForEvent(Modifier.Meta | Modifier.Shift | Modifier.Alt);16await element.dispatchEvent('click', { modifiers: modifiers });17const modifiers = InternalAPIs.modifiersForEvent(Modifier.Meta | Modifier.Shift | Modifier.Alt | Modifier.Control);18await element.dispatchEvent('click', { modifiers: modifiers });19const modifiers = InternalAPIs.modifiersForEvent(Modifier.Meta | Modifier.Shift | Modifier.Alt | Modifier.Control | Modifier.None);20await element.dispatchEvent('click', { modifiers: modifiers });

Using AI Code Generation

1const { modifiersForEvent } = require('playwright/lib/server/keyboard');2async function test() {3  const modifiers = await modifiersForEvent({ shiftKey: true, ctrlKey: true, altKey: true, metaKey: true });4  console.log(modifiers);5}6test();7const { modifiersForEvent } = require('playwright/lib/server/keyboard');8async function test() {9  const modifiers = await modifiersForEvent({ shiftKey: true, ctrlKey: true, altKey: true, metaKey: true, meta: true });10  console.log(modifiers);11}12test();13const { modifiersForEvent } = require('playwright/lib/server/keyboard');14async function test() {15  const modifiers = await modifiersForEvent({ shiftKey: true, ctrlKey: true, altKey: true, metaKey: true, meta: true, alt: true, control: true, shift: true });16  console.log(modifiers);17}18test();19const { modifiersForEvent } = require('playwright/lib/server/keyboard');20async function test() {21  const modifiers = await modifiersForEvent({ shiftKey: true, ctrlKey: true, altKey: true, metaKey: true, meta: true, alt: true, control: true, shift: true, key: 'a' });22  console.log(modifiers);23}24test();25const { modifiersForEvent } = require('playwright/lib/server/keyboard');26async function test() {27  const modifiers = await modifiersForEvent({ shiftKey: true, ctrlKey: true, altKey: true, metaKey: true, meta: true, alt: true, control: true, shift: true, key: 'a', altGraphKey: true

Using AI Code Generation

1const { modifiersForEvent } = require('playwright/lib/server/keyboardLayouts');2const { Keyboard } = require('playwright/lib/server/keyboard');3const keyboard = new Keyboard(null, null);4const modifiers = modifiersForEvent({5}, keyboard._keyForCode);6console.log(modifiers);7const { modifiersForEvent } = require('playwright/lib/server/keyboardLayouts');8const { Keyboard } = require('playwright/lib/server/keyboard');9const keyboard = new Keyboard(null, null);10const modifiers = modifiersForEvent({11}, keyboard._keyForCode);12console.log(modifiers);13const { modifiersForEvent } = require('playwright/lib/server/keyboardLayouts');14const { Keyboard } = require('playwright/lib/server/keyboard');15const keyboard = new Keyboard(null, null);16const modifiers = modifiersForEvent({17}, keyboard._keyForCode);18console.log(modifiers);19const { modifiersForEvent } = require('playwright/lib/server/keyboardLayouts');20const { Keyboard } = require('playwright/lib/server/keyboard');21const keyboard = new Keyboard(null, null);22const modifiers = modifiersForEvent({23}, keyboard._keyForCode);24console.log(modifiers);

Using AI Code Generation

1import { modifiersForEvent } from "playwright-core/lib/server/input";2const modifiers = modifiersForEvent({button: 'left', altKey: true});3import { modifiersForEvent } from "playwright/lib/server/input";4const modifiers = modifiersForEvent({button: 'left', altKey: true});5import { modifiersForEvent } from "playwright/lib/server/input";6const modifiers = modifiersForEvent({button: 'left', altKey: true});7import { modifiersForEvent } from "playwright/lib/server/input";8const modifiers = modifiersForEvent({button: 'left', altKey: true});9import { modifiersForEvent } from "playwright/lib/server/input";10const modifiers = modifiersForEvent({button: 'left', altKey: true});11import { modifiersForEvent } from "playwright/lib/server/input";12const modifiers = modifiersForEvent({button: 'left', altKey: true});13import { modifiersForEvent } from "playwright/lib/server/input";14const modifiers = modifiersForEvent({button: 'left', altKey: true});15import { modifiersForEvent } from "playwright/lib/server/input";16const modifiers = modifiersForEvent({button: 'left', altKey: true});17import { modifiersForEvent } from "playwright/lib/server/input";18const modifiers = modifiersForEvent({button: 'left

StackOverFlow community discussions

Questions

Discussion

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

Running Playwright in Azure Function

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

firefox browser does not start in playwright

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

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

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

Blogs

Check out the latest blogs from LambdaTest on this topic:

Running Tests In Cypress With GitHub Actions [Complete Guide]

In today’s tech world, where speed is the key to modern software development, we should aim to get quick feedback on the impact of any change, and that is where CI/CD comes in place.

Website Testing: A Detailed Guide

Websites and web apps are growing in number day by day, and so are the expectations of people for a pleasant web experience. Even though the World Wide Web (WWW) was invented only in 1989 (32 years back), this technology has revolutionized the world we know back then. The best part is that it has made life easier for us. You no longer have to stand in long queues to pay your bills. You can get that done within a few minutes by visiting their website, web app, or mobile app.

A Comprehensive Guide On JUnit 5 Extensions

JUnit is one of the most popular unit testing frameworks in the Java ecosystem. The JUnit 5 version (also known as Jupiter) contains many exciting innovations, including support for new features in Java 8 and above. However, many developers still prefer to use the JUnit 4 framework since certain features like parallel execution with JUnit 5 are still in the experimental phase.

What exactly do Scrum Masters perform throughout the course of a typical day

Many theoretical descriptions explain the role of the Scrum Master as a vital member of the Scrum team. However, these descriptions do not provide an honest answer to the fundamental question: “What are the day-to-day activities of a Scrum Master?”

What will come after “agile”?

I think that probably most development teams describe themselves as being “agile” and probably most development teams have standups, and meetings called retrospectives.There is also a lot of discussion about “agile”, much written about “agile”, and there are many presentations about “agile”. A question that is often asked is what comes after “agile”? Many testers work in “agile” teams so this question matters to us.

Playwright tutorial

LambdaTest’s Playwright tutorial will give you a broader idea about the Playwright automation framework, its unique features, and use cases with examples to exceed your understanding of Playwright testing. This tutorial will give A to Z guidance, from installing the Playwright framework to some best practices and advanced concepts.

Chapters:

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.
How To Install Playwright : Learn in detail about what basic configuration and dependencies are required for installing Playwright and run a test. Get a step-by-step direction for installing the Playwright automation framework.
Playwright Futuristic Features: Launched in 2020, Playwright gained huge popularity quickly because of some obliging features such as Playwright Test Generator and Inspector, Playwright Reporter, Playwright auto-waiting mechanism and etc. Read up on those features to master Playwright testing.
What is Component Testing: Component testing in Playwright is a unique feature that allows a tester to test a single component of a web application without integrating them with other elements. Learn how to perform Component testing on the Playwright automation framework.
Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
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.
Handling Alerts and Dropdowns in Playwright : Playwright interact with different types of alerts and pop-ups, such as simple, confirmation, and prompt, and different types of dropdowns, such as single selector and multi-selector get your hands-on with handling alerts and dropdown in Playright testing.
Playwright vs Puppeteer: Get to know about the difference between two testing frameworks and how they are different than one another, which browsers they support, and what features they provide.
Run Playwright Tests on LambdaTest: Playwright testing with LambdaTest leverages test performance to the utmost. You can run multiple Playwright tests in Parallel with the LammbdaTest test cloud. Get a step-by-step guide to run your Playwright test on the LambdaTest platform.
Playwright Python Tutorial: Playwright automation framework support all major languages such as Python, JavaScript, TypeScript, .NET and etc. However, there are various advantages to Python end-to-end testing with Playwright because of its versatile utility. Get the hang of Playwright python testing with this chapter.
Playwright End To End Testing Tutorial: Get your hands on with Playwright end-to-end testing and learn to use some exciting features such as TraceViewer, Debugging, Networking, Component testing, Visual testing, and many more.
Playwright Video Tutorial: Watch the video tutorials on Playwright testing from experts and get a consecutive in-depth explanation of Playwright automation testing.