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How to use PureComponent method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactPureComponent-test.js

1/**2 * Copyright (c) Facebook, Inc. and its affiliates.3 *4 * This source code is licensed under the MIT license found in the5 * LICENSE file in the root directory of this source tree.6 *7 * @emails react-core8 */9'use strict';10let React;11let ReactDOM;12describe('ReactPureComponent', () => {13  beforeEach(() => {14    React = require('react');15    ReactDOM = require('react-dom');16  });17  it('should render', () => {18    let renders = 0;19    class Component extends React.PureComponent {20      constructor() {21        super();22        this.state = {type: 'mushrooms'};23      }24      render() {25        renders++;26        return <div>{this.props.text[0]}</div>;27      }28    }29    const container = document.createElement('div');30    let text;31    let component;32    text = ['porcini'];33    component = ReactDOM.render(<Component text={text} />, container);34    expect(container.textContent).toBe('porcini');35    expect(renders).toBe(1);36    text = ['morel'];37    component = ReactDOM.render(<Component text={text} />, container);38    expect(container.textContent).toBe('morel');39    expect(renders).toBe(2);40    text[0] = 'portobello';41    component = ReactDOM.render(<Component text={text} />, container);42    expect(container.textContent).toBe('morel');43    expect(renders).toBe(2);44    // Setting state without changing it doesn't cause a rerender.45    component.setState({type: 'mushrooms'});46    expect(container.textContent).toBe('morel');47    expect(renders).toBe(2);48    // But changing state does.49    component.setState({type: 'portobello mushrooms'});50    expect(container.textContent).toBe('portobello');51    expect(renders).toBe(3);52  });53  it('can override shouldComponentUpdate', () => {54    let renders = 0;55    class Component extends React.PureComponent {56      render() {57        renders++;58        return <div />;59      }60      shouldComponentUpdate() {61        return true;62      }63    }64    const container = document.createElement('div');65    expect(() => ReactDOM.render(<Component />, container)).toErrorDev(66      'Warning: ' +67        'Component has a method called shouldComponentUpdate(). ' +68        'shouldComponentUpdate should not be used when extending React.PureComponent. ' +69        'Please extend React.Component if shouldComponentUpdate is used.',70    );71    ReactDOM.render(<Component />, container);72    expect(renders).toBe(2);73  });74  it('extends React.Component', () => {75    let renders = 0;76    class Component extends React.PureComponent {77      render() {78        expect(this instanceof React.Component).toBe(true);79        expect(this instanceof React.PureComponent).toBe(true);80        renders++;81        return <div />;82      }83    }84    ReactDOM.render(<Component />, document.createElement('div'));85    expect(renders).toBe(1);86  });87  it('should warn when shouldComponentUpdate is defined on React.PureComponent', () => {88    class PureComponent extends React.PureComponent {89      shouldComponentUpdate() {90        return true;91      }92      render() {93        return <div />;94      }95    }96    const container = document.createElement('div');97    expect(() => ReactDOM.render(<PureComponent />, container)).toErrorDev(98      'Warning: ' +99        'PureComponent has a method called shouldComponentUpdate(). ' +100        'shouldComponentUpdate should not be used when extending React.PureComponent. ' +101        'Please extend React.Component if shouldComponentUpdate is used.',102    );103  });...

Parentcomp.js

Source: Parentcomp.js

1import React, { Component,PureComponent } from 'react'2import RegularComp from './RegularComp';3import PureComp from './PureComp';4import MemoComp from './MemoComp';5class Parentcomp extends Component // PureComponent then check this component will not update again and also its chlid because praent component is PureComponent it will use propos and string- primitative6 {7    constructor(props) {8        super(props)9        this.state = { name: 'Ansh' }10    }11    componentDidMount() {12        setInterval(() => { this.setState({ name: 'Anshdfds' }) }, 2000)13    }14    render() {15        console.log("####### Parent component render #######")16        return (17            <div>18                <h1>Parent component</h1>19          {/*   <RegularComp name={this.state.name} />20              <PureComp name={this.state.name} /> */}21               {/* <MemoComp name={this.state.name} />   */}22            </div>)23    }24}25export default Parentcomp26// PureComponent is prevent unneccessary render can you give performance in certain scenario ex. you render list 50 items why not it is re-rendeing then use PureComponent27/* keep in mind You should go for React.PureComponent when you can satisfy any of the below conditions.28â¢	State/Props should be an immutable object29â¢	State/Props should not have a hierarchy30â¢	You should call forceUpdate when data changes31 */32/*  In React, we can create a component by extending the PureComponent class. A Pure Component implements the shouldComponentUpdate lifecycle method by performing a shallow comparison on the props and state...

TripModuleList.js

Source: TripModuleList.js

1import PureComponent from "../../PureComponent";2import TripModuleListTemplate from "./TripModuleList.hbs";3import "./TripModuleList.css";4/**5 * This PureComponent is a TripModuleList PureComponent for entry page.6 */7class TripModuleList extends PureComponent {8	/**9	 * @param {HTMLElement} root This parameter specifies the root PureComponent to render the PureComponent.10	 * @param {Number} index This parameter specifies index number of page.11	 */12	constructor(root) {13		super(root);14		this._elmRoot = super.render(TripModuleListTemplate(), "#cyt_trip_module_root");15		this.DEVICE_HEIGHT = window.innerHeight - 320;16		this.CART_HEIGHT = 152;17		this.LIST_HEIGHT = 95;18	}19	get subRoot() {20		return this._elmRoot;21	}22}...

PureComponent.js

Source: PureComponent.js

1import expandObject from "../expandObject";2import compareDependencies from "../compareDependencies";3import Component from "./Component";4import { RenderSymbol } from "../hooks";5function PureComponent(props) {6	Component.call(this, props);7}8PureComponent.prototype = Object.create(Component.prototype);9PureComponent.prototype.constructor = PureComponent;10const shallowEqual = (a, b) => {11	return compareDependencies(expandObject(a), expandObject(b));12};13PureComponent.prototype.shouldComponentUpdate = function(nextProps, nextState) {14	return (15		!shallowEqual(this.props, nextProps) || !shallowEqual(this.state, nextState)16	);17};18PureComponent[RenderSymbol] = Component[RenderSymbol];19export { PureComponent as default };

CreateBtn.js

Source: CreateBtn.js

1import PureComponent from "../../PureComponent";2import CreateBtnTemplate from "./CreateBtn.hbs";3import "./CreateBtn.css";4/**5 * This PureComponent is a CreateBtn PureComponent for entry page.6 */7class CreateBtn extends PureComponent {8	/**9	 * @param {HTMLElement} root This parameter specifies the root PureComponent to render the PureComponent.10	 * @param {Number} index This parameter specifies index number of page.11	 */12	constructor(root) {13		super(root);14		super.render(CreateBtnTemplate());15		this._init();16	}17	_init() {18		this.btn = document.querySelector("#cyt_entry_create_btn");19	}20	addListener({moveToIntro}) {21		this.btn.addEventListener("click", () => moveToIntro());22	}23}...

TripModuleDescription.js

Source: TripModuleDescription.js

1import PureComponent from "../../PureComponent";2import TripModuleDescriptionTemplate from "./TripModuleDescription.hbs";3import "./TripModuleDescription.css";4/**5 * This PureComponent is a TripModuleDescription PureComponent for entry page.6 */7class TripModuleDescription extends PureComponent {8	/**9	 * @param {HTMLElement} root This parameter specifies the root PureComponent to render the PureComponent.10	 * @param {Number} index This parameter specifies index number of page.11	 */12	constructor(root, {id, day, items}) {13		super(root);14		super.render(TripModuleDescriptionTemplate({15			id,16			day,17			items,18		}));19	}20}...

EmptySlot.js

Source: EmptySlot.js

1import PureComponent from "../../PureComponent";2import EmptySlotTemplate from "./EmptySlot.hbs";3import "./EmptySlot.css";4/**5 * This PureComponent is a EmptySlot PureComponent for entry page.6 */7class EmptySlot extends PureComponent {8	/**9	 * @param {HTMLElement} root This parameter specifies the root PureComponent to render the PureComponent.10	 * @param {Number} index This parameter specifies index number of page.11	 */12	constructor(root) {13		super(root);14		super.render(EmptySlotTemplate());15	}16}...

Header.js

Source: Header.js

1import PureComponent from "../../PureComponent";2import HeaderTemplate from "./Header.hbs";3import "./Header.css";4/**5 * This PureComponent is a Header PureComponent for entry page.6 */7class Header extends PureComponent {8	/**9	 * @param {HTMLElement} root This parameter specifies the root PureComponent to render the PureComponent.10	 * @param {Number} index This parameter specifies index number of page.11	 */12	constructor(root) {13		super(root);14		super.render(HeaderTemplate());15	}16}...

Using AI Code Generation

1const playwright = require('playwright');2(async () => {3  for (const browserType of BROWSER) {4    const browser = await playwright[browserType].launch();5    const context = await browser.newContext();6    const page = await context.newPage();7    await page.screenshot({ path: `example-${browserType}.png` });8    await browser.close();9  }10})();112) In the above code, if we import playwright as a module, then we get the following error:12const playwright = require('playwright');13(async () => {14  for (const browserType of BROWSER) {15    const browser = await playwright[browserType].launch();16    const context = await browser.newContext();17    const page = await context.newPage();18    await page.screenshot({ path: `example-${browserType}.png` });19    await browser.close();20  }21})();223) In the above code, if we import playwright as a module and use the following code, then we get the following error:23const playwright = require('playwright');24(async () => {25  for (const browserType of BROWSER) {26    const browser = await playwright[browserType].launch();27    const context = await browser.newContext();28    const page = await context.newPage();29    await page.screenshot({ path: `example-${browserType}.png` });30    await browser.close();31  }32})();334) In the above code, if we import playwright as a module and use the following code, then we get the following error:34const playwright = require('playwright');35(async () => {36  for (const browserType of BROWSER) {37    const browser = await playwright[browserType].launch();38    const context = await browser.newContext();39    const page = await context.newPage();

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const context = await browser.newContext();5  const page = await context.newPage();6  await page.screenshot({ path: `google.png` });7  await browser.close();8})();9const { chromium } = require('playwright');10(async () => {11  const browser = await chromium.launch();12  const context = await browser.newContext();13  const page = await context.newPage();14  await page.screenshot({ path: `google.png` });15  await browser.close();16})();17const { chromium } = require('playwright');18(async () => {19  const browser = await chromium.launch();20  const context = await browser.newContext();21  const page = await context.newPage();22  await page.screenshot({ path: `google.png` });23  await browser.close();24})();25const { chromium } = require('playwright');26(async () => {27  const browser = await chromium.launch();28  const context = await browser.newContext();29  const page = await context.newPage();30  await page.screenshot({ path: `google.png` });31  await browser.close();32})();33const { chromium } = require('playwright');34(async () => {35  const browser = await chromium.launch();36  const context = await browser.newContext();37  const page = await context.newPage();38  await page.screenshot({ path: `google.png` });39  await browser.close();40})();41const { chromium } = require('playwright');42(async () => {43  const browser = await chromium.launch();44  const context = await browser.newContext();45  const page = await context.newPage();46  await page.screenshot({ path

Using AI Code Generation

1const { Playwright } = require('@playwright/test');2const { chromium } = Playwright;3const browser = await chromium.launch();4const context = await browser.newContext();5const page = await context.newPage();6await page.screenshot({ path: 'example.png' });7await browser.close();8const playwright = require('playwright-core');9const browser = await playwright.chromium.launch();10const context = await browser.newContext();11const page = await context.newPage();12await page.screenshot({ path: 'example.png' });13await browser.close();14const playwright = require('playwright');15const browser = await playwright.chromium.launch();16const context = await browser.newContext();17const page = await context.newPage();18await page.screenshot({ path: 'example.png' });19await browser.close();20const playwright = require('playwright');21const browser = await playwright.chromium.launch();22const context = await browser.newContext();23const page = await context.newPage();24await page.screenshot({ path: 'example.png' });25await browser.close();26const playwright = require('playwright');27const browser = await playwright.chromium.launch();28const context = await browser.newContext();29const page = await context.newPage();30await page.screenshot({ path: 'example.png' });31await browser.close();32const playwright = require('playwright');33const browser = await playwright.chromium.launch();34const context = await browser.newContext();35const page = await context.newPage();36await page.screenshot({ path: 'example.png' });37await browser.close();38const playwright = require('playwright');39const browser = await playwright.chromium.launch();40const context = await browser.newContext();41const page = await context.newPage();42await page.screenshot({ path: 'example.png' });43await browser.close();

Using AI Code Generation

1const { PlaywrightInternal } = require("playwright-core/lib/server/playwright");2const { BrowserContext } = require("playwright-core/lib/server/browserContext");3const { Page } = require("playwright-core/lib/server/page");4const { ElementHandle } = require("playwright-core/lib/server/elementHandler");5const { JSHandle } = require("playwright-core/lib/server/jsHandle");6const { ConsoleMessage } = require("playwright-core/lib/server/console");7const { Frame } = require("playwright-core/lib/server/frames");8const { Worker } = require("playwright-core/lib/server/worker");9const { Dialog } = require("playwright-core/lib/server/dialog");10const { Download } = require("playwright-core/lib/server/download");11const { Route } = require("playwright-core/lib/server/route");12const { WebSocket } = require("playwright-core/lib/server/webSocket");13const { Connection } = require("playwright-core/lib/server/connection");14const { EventEmitter } = require("events");15const playwrightInternal = new PlaywrightInternal();16const browserContext = new BrowserContext(playwrightInternal, null, {17});18const page = new Page(19  { viewport: null, isMobile: false, hasTouch: false },

Using AI Code Generation

1const { PlaywrightInternal } = require('playwright-core/lib/server/playwright');2const { Page } = require('playwright-core/lib/server/page');3const { Frame } = require('playwright-core/lib/server/frame');4const { ElementHandle } = require('playwright-core/lib/server/dom');5const { JSHandle } = require('playwright-core/lib/server/jsHandle');6const { ElementHandleImpl } = require('playwright-core/lib/server/dom');7const { JSHandleImpl } = require('playwright-core/lib/server/jsHandle');8const { ElementHandleChannel } = require('playwright-core/lib/server/channels');9const { JSHandleChannel } = require('playwright-core/lib/server/channels');10const { isDebugMode } = require('playwright-core/lib/utils/utils');11const { debugError } = require('playwright-core/lib/utils/utils');12const { debug } = require('playwright-core/lib/utils/utils');13const { debugLogger } = require('playwright-core/lib/utils/debugLogger');14const { debugLog } = require('playwright-core/lib/utils/debugLogger');15const { debugAssert } = require('playwright-core/lib/utils/utils');16const { assert } = require('playwright-core/lib/utils/utils');17const { helper } = require('playwright-core/lib/utils/helper');18const { helperLog } = require('playwright-core/lib/utils/helper');19const { helperError } = require('playwright-core/lib/utils/helper');20const { helperAssertion } = require('playwright-core/lib/utils/helper');21const { helperValidation } = require('playwright-core/lib/utils/helper');22const { helperWaitWithTimeout } = require('playwright-core/lib/utils/helper');23const { helperWaitNoTimeout } = require('playwright-core/lib/utils/helper');24const { helperWaitEvent } = require('playwright-core/lib/utils/helper');25const { helperWaitEventWithTimeout } = require('playwright-core/lib/utils/helper');26const { helperWaitEventNoTimeout } = require('playwright-core/lib/utils/helper');27const { helperWaitForFunction } = require('playwright-core/lib/utils/helper');28const { helperWaitForFunctionWithTimeout } = require('playwright-core/lib/utils/helper');29const { helperWaitForFunctionNoTimeout } = require('playwright-core/lib/utils/helper');30const { helperWaitForSelector } = require('playwright-core/lib/utils/helper');31const { helperWaitForSelectorWithTimeout } = require('playwright-core/lib/utils

Using AI Code Generation

1const { Playwright } = require('playwright');2const playwright = new Playwright();3const { webkit } = playwright;4const browser = await webkit.launch();5const context = await browser.newContext();6const page = await context.newPage();7await page.screenshot({ path: 'screenshot.png' });8await browser.close();9const { Playwright } = require('playwright');10const playwright = new Playwright();11const { webkit } = playwright;12const browser = await webkit.launch({ devtools: true });13const context = await browser.newContext();14const page = await context.newPage();15await page.screenshot({ path: 'screenshot.png' });16await browser.close();17const { Playwright } = require('playwright');18const playwright = new Playwright();19const { webkit } = playwright;20const browser = await webkit.launch({ devtools: true });21const context = await browser.newContext();22const page = await context.newPage();23await page.screenshot({ path: 'screenshot.png' });24await browser.close();25const { Playwright } = require('playwright');26const playwright = new Playwright();27const { webkit } = playwright;28const browser = await webkit.launch({ devtools: true });29const context = await browser.newContext();30const page = await context.newPage();

Using AI Code Generation

1const { Page } = require('playwright/lib/server/page');2const { ElementHandle } = require('playwright/lib/server/dom/elementHandle');3const { JSHandle } = require('playwright/lib/server/dom/jsHandle');4const { Frame } = require('playwright/lib/server/frame');5const { helper } = require('playwright/lib/helper');6const { assert } = require('playwright/lib/helper');7const { debugError } = require('playwright/lib/helper');8const { debug } = require('playwright/lib/helper');9const { serializeResult } = require('playwright/lib/helper');10const { serializeError } = require('playwright/lib/helper');11const { debugScope } = require('playwright/lib/helper');12const { debugProtocolCommand } = require('playwright/lib/helper');13const { debugProtocolResponse } = require('playwright/lib/helper');14const { debugLog } = require('playwright/lib/helper');15const { debugServer } = require('playwright/lib/helper');16const { debugServerCommand } = require('playwright/lib/helper');17const { debugServerResponse } = require('playwright/lib/helper');18const { debugServerPlaywright } = require('playwright/lib/helper');19const { debugServerPlaywrightError } = require('playwright/lib/helper');20const { debugServerPlaywrightAction } = require('playwright/lib/helper');21const { debugServerPlaywrightActionDone } = require('playwright/lib/helper');22const { debugServerPlaywrightActionError } = require('playwright/lib/helper');23const { debugServerPlaywrightCommand } = require('playwright/lib/helper');24const { debugServerPlaywrightResponse } = require('playwright/lib/helper');25const { debugServerPlaywrightCommandError } = require('playwright/lib/helper');26const { debugServerPlaywrightResponseError } = require('playwright/lib/helper');27const { debugServerPlaywrightResponseErrorResult } = require('playwright/lib/helper');28const { debugServerPlaywrightResponseErrorData } = require('playwright/lib/helper');29const { debugServerPlaywrightResponseErrorFrame } = require('playwright/lib/helper');30const { debugServerPlaywrightResponseErrorFrameError } = require('playwright/lib/helper');31const { debugServerPlaywrightResponseErrorFrameErrorData } = require('playwright/lib/helper');32const { debugServerPlaywrightResponseErrorFrameErrorResult } = require('playwright/lib/helper');33const { debugServerPlaywrightResponseError

Using AI Code Generation

1const { PlaywrightInternal } = require('playwright');2const { Page } = PlaywrightInternal;3const { Frame } = PlaywrightInternal;4const { ElementHandle } = PlaywrightInternal;5const { PlaywrightInternal } = require('playwright');6const { Page } = PlaywrightInternal;7const { Frame } = PlaywrightInternal;8const { ElementHandle } = PlaywrightInternal;9async function test() {10  const page = await browser.newPage();11  const elementHandle = await page.$('input[name="q"]');12  const pureElementHandle = new ElementHandle(page, elementHandle._guid, elementHandle._initializer);13  const pureFrame = new Frame(page, pureElementHandle._frame._guid, pureElementHandle._frame._initializer);14  const purePage = new Page(pureFrame._session, pureFrame._guid, pureFrame._initializer);15  await purePage.waitForSelector('input[name="q"]');16  const page = await browser.newPage();17  const elementHandle = await page.$('input[name="q"]');18  await elementHandle.waitForSelector('input[name="q"]');19}20test();21@yury-s I have a question. Is there a way to get the pure element handle of the element handle that is returned by the $() method?

Using AI Code Generation

1const playwright = require('playwright');2const { chromium } = playwright;3const { test } = require('@playwright/test');4test.use({ 5});6test('Google test', async ({ page }) => {7    await page.goto('/');8    await page.fill('input[name="q"]', 'Hello World');9    await page.click('input[value="Google Search"]');10    await page.waitForSelector('text=Hello World');11    await page.click('text=Hello World');12    await page.waitForNavigation();13    await page.click('text=Images');14    await page.waitForSelector('img[alt="Hello World"]');15    await page.click('img[alt="Hello World"]');16    await page.waitForSelector('img[alt="Hello World"]');17    await page.click('img[alt="Hello World"]');18    await page.waitForSelector('img[alt="Hello World"]');19    await page.click('text=Images');20    await page.waitForSelector('img[alt="Hello World"]');21    await page.click('img[alt="Hello World"]');22    await page.waitForSelector('img[alt="Hello World"]');23    await page.click('img[alt="Hello World"]');24    await page.waitForSelector('img[alt="Hello World"]');25    await page.click('text=Images');26    await page.waitForSelector('img[alt="Hello World"]');27    await page.click('img[alt="Hello World"]');28    await page.waitForSelector('img[alt="Hello World"]');29    await page.click('img[alt="Hello World"]');30    await page.waitForSelector('img[alt="Hello World"]');31    await page.click('text=Images');32    await page.waitForSelector('img[alt="Hello World"]');33    await page.click('img[alt="Hello World"]');34    await page.waitForSelector('img[alt="Hello World"]');35    await page.click('img[alt="Hello World"]');36    await page.waitForSelector('img[alt="Hello World"]');37    await page.click('text=Images');38    await page.waitForSelector('img[alt="Hello World"]');39    await page.click('img[alt="Hello World"]');40    await page.waitForSelector('img[alt="Hello World"]');41    await page.click('img[alt="Hello World"]');42    await page.waitForSelector('img[alt="Hello World"]');43    await page.click('text=Images');

Using AI Code Generation

1require('playwright/lib/utils/stackTrace.js');2require('playwright/lib/utils/stackTrace.js');3require('playwright/lib/utils/stackTrace.js');4require('playwright/lib/utils/stackTrace.js');5require('playwright/lib/utils/stackTrace.js');6require('playwright/lib/utils/stackTrace.js');7require('playwright/lib/utils/stackTrace.js');8require('playwright/lib/utils/stackTrace.js');9require('playwright/lib/utils/stackTrace.js');10require('playwright/lib/utils/stackTrace.js');11require('playwright/lib/utils/stackTrace.js');12require('playwright/lib/utils/stackTrace.js');13require('playwright/lib/utils/stackTrace.js');14require('playwright/lib/utils/stackTrace.js');15require('playwright/lib/utils/stackTrace.js');16require('playwright/lib/utils/stackTrace.js');17require('playwright/lib/utils/stackTrace.js');18require('playwright/lib/utils/stackTrace.js');19require('playwright/lib/utils/stackTrace.js');20require('playwright/lib/utils/stackTrace.js');21require('playwright/lib/utils/stackTrace.js');22require('playwright/lib/utils/stackTrace.js');23require('playwright/lib/utils/stackTrace.js');24require('playwright/lib/utils/stackTrace.js');25require('playwright/lib/utils/stackTrace.js');26require('playwright/lib/utils/stackTrace.js');27require('playwright

StackOverFlow community discussions

Questions

Discussion

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

Running Playwright in Azure Function

firefox browser does not start in playwright

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firefox browser does not start in playwright

Is it possible to get the selector from a locator object 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

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

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

Blogs

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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.