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How to use createWorkInProgress method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactChildFiber.js

...13} from 'shared/ReactWorkTags';14import {REACT_ELEMENT_TYPE} from 'shared/ReactSymbols';15// å¯¹äºåè°åä¸èç¹è¿ç¨ä¸ï¼åå»ºçworkInProgresséè¦å»æä»çsiblingæå16function useFiber(fiber, pendingProps) {17  const clone = createWorkInProgress(fiber, pendingProps);18  clone.sibling = null;19  clone.index = 0;20  return clone;21}22export function cloneChildFibers(current, workInProgress) {23  const currentChild = workInProgress.child;24  if (!currentChild) return;25  let newChild = createWorkInProgress(currentChild, currentChild.pendingProps);26  workInProgress.child = newChild;27  newChild.return = workInProgress;28  while (currentChild.sibling) {29    currentChild = currentChild.sibling;30    newChild = newChild.sibling = createWorkInProgress(currentChild, currentChild.pendingProps);31    newChild.return = workInProgress;32  }33  newChild.sibling = null;34}35// ä¸ºäºå¨2ä¸ªæ¹æ³ä¸å¤ç¨ä¸æ¹å±ç¨æ¹æ³36// shouldTrackSideEffectsæ ç¤ºæ¯å¦æ è®°fiberçeffectTag37// å¯¹äºé¦æ¬¡æ¸²æï¼ä¸éè¦æ è®°effectTagï¼å ä¸ºcompleteWorkæ¶ä¼appendAllChildrenï¼æåä¸æ¬¡æ¸²ææ´æ£µæ 38// å¯¹äºåæ¬¡æ´æ°ï¼éè¦æ è®°æ´æ°fiberçeffectTag39function ChildReconciler(shouldTrackSideEffects) {40  function createChild(returnFiber, newChild, expirationTime) {41    if (typeof newChild === 'number' || typeof newChild === 'string') {42      const created = createFiberFromText(newChild, expirationTime);43      created.return = returnFiber;44      return created;...

ReactFiberBeginWork.js

Source: ReactFiberBeginWork.js

...247  if (workInProgress.child === null) {248    return249  }250  let currentChild = workInProgress.child251  let newChild = createWorkInProgress(currentChild, currentChild.pendingProps)252  workInProgress.child = newChild253  newChild.return = workInProgress254  while (currentChild.sibling !== null) {255    currentChild = currentChild.sibling256    newChild = newChild.sibling = createWorkInProgress(257      currentChild,258      currentChild.pendingProps259    )260    newChild.return = workInProgress261  }262  newChild.sibling = null263}264export function markWorkInProgressReceivedUpdate() {265  didReceiveUpdate = true...

vdom.js

Source: vdom.js

...28}29function workLoop(deadline) {30  if (!Renderer.nextUnitOfWork) {31    //ä¸ä¸ªå¨æååªåå»ºä¸æ¬¡32    Renderer.nextUnitOfWork = createWorkInProgress(Renderer.updateQueue)33  }34  while (Renderer.nextUnitOfWork && deadline.timeRemaining() > EXPIRATION_TIME) {35    Renderer.nextUnitOfWork = performUnitOfWork(Renderer.nextUnitOfWork)36  }37  if (Renderer.pendingCommit) {38    //å½å¨å± Renderer.pendingCommit åéè¢«è´å¼39    commitAllwork(Renderer.pendingCommit)40  }41}42function commitAllwork(topFiber) {43  topFiber.effects.forEach(f => {44    commitWork(f)45  })46  topFiber.stateNode._rootContainerFiber = topFiber...

react-dom.js

Source: react-dom.js

...32}33function createFiber(){34    return new FiberNode();35}36function createWorkInProgress(current,pendingProps){37    let workInProgress = current.alternate;//å¤ç¨current.alternate38    if(!workInProgress){39        workInProgress = createFiber(current.tag,pendingProps,current.key);40        workInProgress.type = current.type;41        workInProgress.stateNode = current.stateNode;42        workInProgress.alternate = current;43        current.alternate = workInProgress;44    } else {45        workInProgress.pendingProps = pendingProps;46        workInProgress.effectTag = NoWork;47        workInProgress.firstEffect = null;48        workInProgress.lastEffect = null;49        workInProgress.nextEffect = null;50    }51    //ä¿è¯ currentåcurrent.alternateçupdatequeueæ¯åæ¥ç52    workInProgress.updateQueue = current.updateQueue;53    workInProgress.child = current.child;54    workInProgress.memoizedProps = current.memoizedProps;55    workInProgress.memoizedState  = current.memoizedState;56    workInProgress.sibling = current.sibling;57    workInProgress.index = current.index;58    return workInProgress;59}60class ReactRoot{61    constructor(container){62        this._internalRoot = this._createRoot(container);63    }64    _createRoot(container){65        let uninitialFiber = this._createUninitialFiber(HostRoot,null,null);66        let root = {67            container,68            current: uninitialFiber,69            finishedWork:null70        };71        uninitialFiber.stateNode = root;72        return root;73    }74    _createUninitialFiber(tag,key,pendingProps){75        return createFiber(tag,key,pendingProps);76    }77    render(reactElement,callback){78        let root = this._internalRoot;79        let workInProgress = createWorkInProgress(root.current,null,);80    }81}82const ReactDOM = {83    render(reactElement,container,callback){84        isFirstRender = true;85        let root = new ReactRoot(container)86        container._reactRootContainer = root;87        isFirstRender = false;88    }89}...

ReactFiber.dev.js

Source: ReactFiber.dev.js

...28 * æ ¹æ®èfiberåå»ºæ°çfiber29 * @param {*} current 30 * @param {*} pendingProps 31 */32function createWorkInProgress(current, pendingProps) {33  var workInProgress = current.alternate;34  if (!workInProgress) {35    workInProgress = createFiber(current.tag, pendingProps, current.key);36    workInProgress.type = current.type;37    workInProgress.stateNode = current.stateNode;38    workInProgress.alternate = current;39    current.alternate = workInProgress;40  } else {41    workInProgress.pendingProps = pendingProps;42  }43  workInProgress.flags = _ReactFiberFlags.NoFlags;44  workInProgress.child = null;45  workInProgress.sibling = null;46  workInProgress.updateQueue = current.updateQueue; //å¨dom diffçè¿ç¨ä¼ç»fiberæ·»å å¯ä½ç¨...

ReactFiber.js

Source: ReactFiber.js

...21 * æ ¹æ®èfiberåå»ºæ°çfiber22 * @param {*} current 23 * @param {*} pendingProps 24 */25export function createWorkInProgress(current, pendingProps) {26    let workInProgress = current.alternate;27    if (!workInProgress) {28        workInProgress = createFiber(current.tag, pendingProps, current.key);29        workInProgress.type = current.type;30        workInProgress.stateNode = current.stateNode;31        workInProgress.alternate = current;32        current.alternate = workInProgress;33    } else {34        workInProgress.pendingProps = pendingProps;35    }36    workInProgress.flags = NoFlags;37    workInProgress.child = null;38    workInProgress.sibling = null;39    workInProgress.updateQueue = current.updateQueue;...

ReactFiberWorkLoop.js

Source: ReactFiberWorkLoop.js

...17 * @param {*} fiberRoot 18 */19function performSyncWorkOnRoot(fiberRoot) {20    workInProgressRoot = fiberRoot;21    workInProgress = createWorkInProgress(workInProgressRoot.current);22    console.log(workInProgress);23}24function markUpdateLaneFromFiberToRoot(sourceFiber) {25    let node = sourceFiber;26    let parent = node.return;27    while (parent) {28        node = parent;29        parent = parent.parent;30    }31    //nodeå¶å®è¯å®fiberæ çæ ¹èç¹ï¼å¶å®å°±æ¯ hostRootFiber .stateNode div#root32    return node.stateNode;...

createWorkInProgress.js

Source: createWorkInProgress.js

...3//   from: HOST_ROOT,4//   stateNode: Container,5//   props: { children: Vnode }6// }7export function createWorkInProgress(updateQueue) {8  const updateTask = updateQueue.shift()9  if (!updateTask) return10  if (updateTask.partialState) {11    // è¯æè¿æ¯ä¸ä¸ªsetStateæä½12    updateTask.stateNode._internalfiber.partialState = updateTask.partialState13  }14  const rootFiber =15    updateTask.fromTag === tag.HOST_ROOT16      ? updateTask.stateNode._rootContainerFiber17      : getRoot(updateTask.stateNode._internalfiber)18  return {19    tag: tag.HOST_ROOT,20    stateNode: updateTask.stateNode,21    props: updateTask.props || rootFiber.props,...

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  const context = page.context();6  const workInProgress = context.createWorkInProgress();7  console.log(workInProgress);8  await browser.close();9})();

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  const context = page.context();6  const newPage = context.createWorkInProgress(page);7  await newPage.screenshot({ path: 'work-in-progress.png' });8  await browser.close();9})();10module.exports = {11  use: {12  },13};14    at BrowserContext.newContext (/Users/username/Projects/playwright-test/node_modules/playwright/lib/client/browserContext.js:94:15)15    at Browser.newContext (/Users/username/Projects/playwright-test/node_modules/playwright/lib/client/browser.js:77:29)16    at BrowserContext.createWorkInProgress (/Users/username/Projects/playwright-test/node_modules/playwright/lib/client/browserContext.js:167:23)17    at Object.<anonymous> (/Users/username/Projects/playwright-test/test.js:9:27)18    at Module._compile (internal/modules/cjs/loader.js:1137:30)19    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1157:10)20    at Module.load (internal/modules/cjs/loader.js:985:32)21    at Function.Module._load (internal/modules/cjs/loader.js:878:14)22    at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)

Using AI Code Generation

1const playwright = require('playwright');2const { createWorkInProgress } = require('playwright/lib/server/browserContext');3(async () => {4  const browser = await playwright.chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  const workInProgressContext = createWorkInProgress(context);8  const workInProgressPage = await workInProgressContext.newPage();9  await page.screenshot({ path: 'google.png' });10  await workInProgressPage.screenshot({ path: 'youtube.png' });11  await browser.close();12})();13{14  "scripts": {15  },16  "dependencies": {17  }18}

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  const context = page.context();6  const page2 = context.createWorkInProgress(page);7  await page2.screenshot({ path: 'page2.png' });8  await browser.close();9})();10const { chromium } = require('playwright');11(async () => {12  const browser = await chromium.launch();13  const context = await browser.newContext();14  const page = await context.newPage();15  const page2 = context.createWorkInProgress(page);16  await page2.screenshot({ path: 'page2.png' });17  await browser.close();18})();

Using AI Code Generation

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

Using AI Code Generation

1const { createWorkInProgress } = require('playwright/lib/server/browserContext');2const { BrowserContext } = require('playwright/lib/server/browserContext');3const { Page } = require('playwright/lib/server/page');4const { BrowserServer } = require('playwright/lib/server/browserServer');5const { Browser } = require('playwright/lib/server/browser');6const { helper } = require('playwright/lib/server/helper');7const { BrowserType } = require('playwright/lib/server/browserType');8const { BrowserContextDispatcher } = require('playwright/lib/server/browserContextDispatcher');9const { PageDispatcher } = require('playwright/lib/server/pageDispatcher');10const { DispatcherConnection } = require('playwright/lib/server/dispatcher');11const { BrowserTypeDispatcher } = require('playwright/lib/server/browserTypeDispatcher');12const { BrowserServerDispatcher } = require('playwright/lib/server/browserServerDispatcher');13const { BrowserDispatcher } = require('playwright/lib/server/browserDispatcher');14const { BrowserContextChannel } = require('playwright/lib/channels');15const { PageChannel } = require('playwright/lib/channels');16const { BrowserServerChannel } = require('playwright/lib/channels');17const { BrowserTypeChannel } = require('playwright/lib/channels');18const { BrowserChannel } = require('playwright/lib/channels');19const { BrowserContextBase } = require('playwright/lib/server/browserContextBase');20const { Playwright } = require('playwright/lib/server/playwright');21const { PlaywrightDispatcher } = require('playwright/lib/server/playwrightDispatcher');22const { PlaywrightChannel } = require('playwright/lib/channels');23const { Transport } = require('playwright/lib/server/transport');24const { Connection } = require('playwright/lib/server/connection');25const { Events } = require('playwright/lib/server/events');26const { chromium } = require('playwright');27(async () => {28  const browser = await chromium.launch();29  const context = await browser.newContext();30  const page = await context.newPage();31  const wipContext = createWorkInProgress(context);32  const wipPage = createWorkInProgress(page);33})();34const { BrowserContextBase } = require('./browserContextBase');35const { Page } = require('./page');36const { helper } = require('./helper');37const { assert } = require('./helper

Using AI Code Generation

1const { chromium } = require('playwright');2const { createWorkInProgress } = require('playwright/lib/server/browserContext');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  const wip = createWorkInProgress(context);8  const wipPage = await wip.newPage();9  const cookies = await wipPage.context().cookies();10  console.log(cookies);11  await wip.close();12  await browser.close();13})();

Using AI Code Generation

1const playwright = require('playwright');2const { createWorkInProgress } = require('playwright/lib/server/browserType');3const browser = await playwright.chromium.launch();4const page = await browser.newPage();5const wip = createWorkInProgress(page);6await wip.waitForSelector('title');7await wip.waitForSelector('input[name="q"]');8await wip.fill('input[name="q"]', 'Playwright');9await wip.waitForSelector('input[name="btnK"]');10await wip.click('input[name="btnK"]');11await wip.waitForNavigation();12await wip.waitForSelector('h3');13await wip.screenshot({ path: 'google.png' });14await wip.close();15await browser.close();16{17  "scripts": {18  },19  "dependencies": {20  }21}22import { chromium } from 'playwright';23import { createWorkInProgress } from 'playwright/lib/server/browserType';24(async () => {25  const browser = await chromium.launch();26  const page = await browser.newPage();27  const wip = createWorkInProgress(page);28  await wip.waitForSelector('title');29  await wip.waitForSelector('input[name="q"]');30  await wip.fill('input[name="q"]', 'Playwright');31  await wip.waitForSelector('input[name="btnK"]');32  await wip.click('input[name="btnK"]');33  await wip.waitForNavigation();34  await wip.waitForSelector('h3');35  await wip.screenshot({ path: 'google.png' });36  await wip.close();37  await browser.close();38})();39{40  "compilerOptions": {

Using AI Code Generation

1const { createWorkInProgress } = require('playwright/lib/server/browserContext');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  const workInProgress = createWorkInProgress(context);8  const newPage = await workInProgress.newPage();9  await browser.close();10})();11const { chromium } = require('playwright');12(async () => {13  const browser = await chromium.launch();14  const context = await browser.newContext();15  const page = await context.newPage();16  const workInProgress = createWorkInProgress(context);17  const newContext = await workInProgress.newContext();18  const newPage = await newContext.newPage();19  await browser.close();20})();

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

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

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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Sometimes, in our test code, we need to handle actions that apparently could not be done automatically. For example, some mouse actions such as context click, double click, drag and drop, mouse movements, and some special key down and key up actions. These specific actions could be crucial depending on the project context.

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.