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How to use performSyncWorkOnRoot method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactWorkLoop.js

Source:ReactWorkLoop.js

...9let workInProgress = null;1011export function scheduleUpdateOnFiber(fiber) {12  const fiberRoot = markUpdateLaneFromFiberToRoot(fiber);13  performSyncWorkOnRoot(fiberRoot);14}1516/**17 * æ¾å°æé¡¶çº§çfiberèç¹ï¼æé¡¶çº§çfiberèç¹æ²¡æparentæé18 */19function markUpdateLaneFromFiberToRoot(sourceFiber) {20  let node = sourceFiber;21  let parent = node.return;22  while (parent) {23    node = parent;24    parent = node.parent;25  }26  return node.stateNode;27}2829function performSyncWorkOnRoot(fiberRoot) {30  workInProgressRoot = fiberRoot;31  workInProgress = createWorkInProgress(workInProgressRoot.current);3233  workLoopSync(); // æ§è¡å·¥ä½å¾ªç¯34  commitRoot()  // æäº¤ä¿®æ¹çDOM35}3637function workLoopSync() {38  while (workInProgress) {39    performUnitOfWork(workInProgress);40  }41}4243/**
...

index.js

Source:index.js

...19function render(element, root) {20  // console.log(element)21  let fiberRoot = legacyCreateRootFromDOMContainer(element, root);22  23  performSyncWorkOnRoot(fiberRoot)24}25function legacyCreateRootFromDOMContainer (element, root) { 26  return {27    stateNode: root,28    props: {29      children: [element]30    }31  }32}33function performSyncWorkOnRoot(fiberRoot){34  workInProgressRoot = fiberRoot;35  nextUnitOfWork = workInProgressRoot;36  37  workLoopSync()38  39}40// æ§è¡ä»»å¡å¾ªç¯41function workLoopSync () {  42   43  while(nextUnitOfWork != null){44    nextUnitOfWork = performUnitOfWork(nextUnitOfWork)45  }46  47  if (!nextUnitOfWork) {...

FiberWorkLoop.js

Source:FiberWorkLoop.js

...43}44export function scheduleUpdateOnFiber(45  fiber46) {47  performSyncWorkOnRoot(fiber.stateNode)48}49function performSyncWorkOnRoot(root) {50  renderRootSync(root)51  //AcommitRoot(root)52}53function renderRootSync(root) {54  if (workInProgressRoot !== root) {55    // Mount56    prepareFreshStack(root)57  }58  workLoopSync()59}60function workLoopSync() {61  while(workInProgress !== null) {62    performUnitOfWork(workInProgress)63  }...

4.5.ReactFiberWorkLoop.js

Source:4.5.ReactFiberWorkLoop.js

...30function scheduleSyncCallback(callback){31    syncQueue.push(callback)32}33//æ§è¡æ¸²æä»»å¡34function performSyncWorkOnRoot(workInProgress){35    let root = workInProgress;36    console.log('å¼å§è°åä»»å¡')37    while(workInProgress){38        if(workInProgress.tag === ClassComponent){39            let inst =workInProgress.stateNode;40            inst.state = processUpdateQueue(inst,workInProgress)41            inst.render(); //å¾å°ææ°ç¶æå,å°±å¯ä»¥è°ç¨renderæ¹æ³éè¿ææ°çèædomï¼éè¿diffæ´æ°42        }43        workInProgress = workInProgress.child44    }45    commitRoot(root)46}47function commitRoot(root){48}...

scheduleUpdateOnFiber.js

Source:scheduleUpdateOnFiber.js

1import { classComponent, HostRoot } from "./ReactWorkTags";2import { RootFiber } from './index';3import { ConcurrentMode, NoMode } from "./ReactTypeofMode";4const Queue = []5// éæ¹é6export const NoContext = /*             */ 0b000;7const BatchedContext = /*               */ 0b001;8let executionContext = NoContext;9const scheduleSyncCallback = (callback) => Queue.push(callback);10/**11 * è°å12 * @param {*} workInProgress 13 */14const performSyncWorkOnRoot = (workInProgress) => {15    const root = workInProgress;16    while (workInProgress) {17        if (workInProgress.tag === classComponent) {18            const instance = workInProgress.stateNode;19            // æ ¹æ®èç¶æåæ°ç¶æè¿è¡æ´æ°20            instance.state = workInProgress.updateQueue.reduce((pre, { payload }) => ({21                ...pre,22                ...(typeof payload === 'function' ? payload(pre) : payload)23            }), instance.state);24            instance.render();25        }26        workInProgress = workInProgress.child;27    }28    root.callbackPriority = 029}30/**31 * è°åº¦32 * @param {*} root 33 * @param {*} eventTime 34 * @returns 35 */36const ensureRootIsScheduled = (root, eventTime) => {37    // è·åèµéä¸é¢æé«çä¼åçº§38    const newCallbackPriority = 12;39    const existingCallbackPriority = root?.callbackPriority;40    if (existingCallbackPriority === newCallbackPriority) {41        console.log('è°åº¦æ¬¡æ°');42        return;43    }44    scheduleSyncCallback(performSyncWorkOnRoot.bind(null, root));45    queueMicrotask(flushSyncCallbackQueue);46    root.callbackPriority = newCallbackPriority;47}48function flushSyncCallbackQueue() {49    Queue.forEach(cb => cb());50    Queue.length = 0;51}52/**53 * å¨è¯¥fiberä¸é¢è¿è¡è°åº¦æ´æ°54 * @param {*} fiber 55 * @param {*} lane 56 * @param {*} eventTime 57 */58const scheduleUpdateOnFiber = (fiber, lane, eventTime) => {59    // è°åº¦60    ensureRootIsScheduled(RootFiber, eventTime);61    if (executionContext === NoContext && (fiber.mode & ConcurrentMode) === NoMode) {62        flushSyncCallbackQueue();63    }64}65/**66 * æ¹éæ´æ°67 * @param {*} fn 68 */69export const batchedUpdates = (fn) => {70    executionContext |= BatchedContext;71    fn();72    executionContext = NoContext;73}...

状态更新调用路径.js

Source:状态更新调用路径.js

1/*2 *3è§¦åç¶ææ´æ°ï¼æ ¹æ®åºæ¯è°ç¨ä¸åæ¹æ³ï¼4            1.ReactDOM.render5            2.this.setState6            3.this.forceUpdate7            4.useState8            5.useReducer9    |10    |11    v12åå»ºUpdateå¯¹è±¡ï¼'updateContainer'ï¼13    |14    |15    v16ä»fiberå°rootï¼`markUpdateLaneFromFiberToRoot`ï¼17            ï¼ä»è§¦åç¶ææ´æ°çfiberä¸ç´åä¸éåå°rootFiberï¼å¹¶è¿årootFiberãï¼18    |19    |20    v21è°åº¦æ´æ°ï¼`ensureRootIsScheduled`ï¼ åæ¥/å¼æ¥22                ä»¥ä¸æ¯ensureRootIsScheduledææ ¸å¿çä¸æ®µä»£ç ï¼23                if (newCallbackPriority === SyncLanePriority) {24                    // ä»»å¡å·²ç»è¿æï¼éè¦åæ¥æ§è¡renderé¶æ®µ25                    newCallbackNode = scheduleSyncCallback(26                        performSyncWorkOnRoot.bind(null, root)27                    );28                    } else {29                    // æ ¹æ®ä»»å¡ä¼åçº§å¼æ¥æ§è¡renderé¶æ®µ30                    var schedulerPriorityLevel = lanePriorityToSchedulerPriority(31                        newCallbackPriority32                    );33                    newCallbackNode = scheduleCallback(34                        schedulerPriorityLevel,35                        performConcurrentWorkOnRoot.bind(null, root)36                    );37                }38    |39    |40    v41renderé¶æ®µï¼`performSyncWorkOnRoot` æ `performConcurrentWorkOnRoot`ï¼42    |43    |44    v45commité¶æ®µï¼`commitRoot`ï¼...

ReactFiberWorkLoop.js

Source:ReactFiberWorkLoop.js

...9 * @param {*} fiber 10 */11export function scheduleUpdateOnFiber(fiber) {12    const fiberRoot = markUpdateLaneFromFiberToRoot(fiber);13    performSyncWorkOnRoot(fiberRoot);14}15/**16 * æ ¹æ®èçfiberæ åæ´æ°å¯¹è±¡åå»ºæ°çfiberæ ï¼ç¶åæ ¹æ®æ°çfiberæ æ´æ°çå®DOM17 * @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;33}

updateState.js

Source:updateState.js

1// è§¦åç¶ææ´æ°2//   |3//   v4// åå»ºUpdateå¯¹è±¡5//   |6//   v7// ä»fiberå°root8//   |9//   v10// è°åº¦æ´æ°11//   |12//   v13// renderé¶æ®µ - performSyncWorkOnRoot æ performConcurrentWorkOnRoot14//   |15//   v...

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3const browser = await chromium.launch({ headless: false });4const context = await browser.newContext();5const page = await context.newPage();6await page.screenshot({ path: `example.png` });7await browser.close();8})();

Using AI Code Generation

1const { performSyncWorkOnRoot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');2const { RecorderSupplement } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');3const { Frame } = require('playwright/lib/server/chromium/crPage.js');4const { Page } = require('playwright/lib/server/chromium/crPage.js');5const { ElementHandle } = require('playwright/lib/server/chromium/crElementHandle.js');6const { JSHandle } = require('playwright/lib/server/chromium/crJSHandle.js');7const { helper } = require('playwright/lib/server/helper.js');8const frame = new Frame(new Page(new RecorderSupplement()));9const elementHandle = new ElementHandle(new JSHandle(new Page(new RecorderSupplement())), {});10const jsHandle = new JSHandle(new Page(new RecorderSupplement()));11const helperObject = new helper();12performSyncWorkOnRoot(frame, elementHandle, jsHandle, helperObject);

Using AI Code Generation

1const { performSyncWorkOnRoot } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');2const { RecorderSupplement } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');3const { Page } = require('playwright/lib/server/page.js');4const { Frame } = require('playwright/lib/server/frame.js');5const { ElementHandle } = require('playwright/lib/server/dom.js');6const { chromium } = require('playwright');7(async () => {8  const browser = await chromium.launch();9  const page = await browser.newPage();10  const element = await page.$('text=Get started');11  await element.click();12  await page.waitForTimeout(5000);13  await browser.close();14})();15const { helper } = require('playwright/lib/server/helper.js');16const { PageSupplement } = require('playwright/lib/server/pageSupplement.js');17const { FrameSupplement } = require('playwright/lib/server/frameSupplement.js');18const { ElementHandleSupplement } = require('playwright/lib/server/elementHandleSupplement.js');19const { RecorderSupplement } = require('playwright/lib/server/supplements/recorder/recorderSupplement.js');20const { Page } = require('playwright/lib/server/page.js');21const { Frame } = require('playwright/lib/server/frame.js');22const { ElementHandle } = require('playwright/lib/server/dom.js');23module.exports = {24};25function performSyncWorkOnRoot(root, callback) {26  const supplement = getSupplement(root);27  return supplement._performSyncWork(callback);28}29function getSupplement(root) {30  if (root instanceof Page)31    return root._pageSupplement(RecorderSupplement);32  if (root instanceof Frame)33    return root._frameSupplement(RecorderSupplement);34  if (root instanceof ElementHandle)35    return root._elementHandleSupplement(RecorderSupplement);36  throw new Error('Unknown root type');37}38const { helper } = require('playwright/lib/server/helper.js');39const { PageSupplement } = require('playwright/lib/server/pageSupplement.js');40const { FrameSupplement } = require('playwright/lib/server/frameSupplement.js');41const { ElementHandleSupplement } =

Using AI Code Generation

1const { Playwright } = require('playwright');2const playwright = new Playwright();3const browser = await playwright.chromium.launch();4const context = await browser.newContext();5const page = await context.newPage();6const { performSyncWorkOnRoot } = require('playwright/lib/internal/inspectorAdapters/inspectorAdapter');7await performSyncWorkOnRoot(page, 'Runtime.evaluate', { expression: '1 + 1' });8await browser.close();

Using AI Code Generation

1const path = require('path');2const playwright = require('playwright');3(async () => {4  const browser = await playwright['chromium'].launch({5  });6  const page = await browser.newPage();7  await page.goto(url);8  await page.waitForSelector('#btn');9  const result = await page.evaluate(() => {10    const root = document.getElementById('root');11    const btn = document.getElementById('btn');12    const { performSyncWorkOnRoot } = window['ReactDom'];13    const onCommit = performSyncWorkOnRoot(root, () => {14      btn.innerText = 'I am clicked';15    });16    onCommit.then(() => {17      console.log('I am clicked');18    });19  });20  await browser.close();21})();22const rootElement = document.getElementById('root');23const btn = document.createElement('button');24btn.innerText = 'Click me';25btn.id = 'btn';26rootElement.appendChild(btn);27btn.addEventListener('click', () => {28  const { unstable_batchedUpdates } = window['ReactDom'];29  unstable_batchedUpdates(() => {30    btn.innerText = 'I am clicked';31  });32});33{34  "scripts": {35  },36  "dependencies": {37  }38}

Using AI Code Generation

1const { Playwright } = require('playwright');2const { Internal } = require('playwright/lib/server/playwright');3const { Page } = require('playwright/lib/server/page');4const { Frame } = require('playwright/lib/server/frame');5const { JSHandle } = require('playwright/lib/server/jsHandle');6const { ElementHandle } = require('playwright/lib/server/elementHandler');7const { createJSHandle } = require('playwright/lib/server/frames');8const { createHandle } = require('playwright/lib/server/injected/injectedScript');9const playwright = new Playwright();10const internal = new Internal(playwright);11const page = new Page(internal, 'page1', null, null);12const frame = new Frame(page, 'frame1', null);13const jsHandle = createJSHandle(frame, createHandle('test'));14const elementHandle = new ElementHandle(frame, jsHandle, null);15const result = internal.performSyncWorkOnRoot(elementHandle, () => {16  return document.body;17});18console.log(result);

Using AI Code Generation

1const { getTestState } = require("@playwright/test");2const { performSyncWorkOnRoot } = require("@playwright/test/lib/server/supplements/recorder/recorderSupplement");3module.exports = {4  async test(testInfo) {5    const { page, context } = getTestState(testInfo);6    await page.click("text=Get started");7    await page.click("text=Go to docs");8    await page.click("text=Go to API");9    await page.click("text=Go to examples");10    await page.click("text=Go to blog");11    await page.click("text=Go to community");12    await page.click("text=Go to GitHub");13    await page.click("text=Go to Twitter");14    await page.click("text=Go to Discord");15    await page.click("text=Go to YouTube");16    await page.click("text=Go to Stack Overflow");17    performSyncWorkOnRoot(context);18  },19};20const { PlaywrightTestConfig } = require("@playwright/test");21const config = {22    {23      use: {24      },25    },26  use: {27  },28};29module.exports = config;30{31  "scripts": {32  },33  "dependencies": {34  }35}

Using AI Code Generation

1console.log("Hello");2await page.evaluate(() => {3  const root = document.getElementById('root');4  const container = document.createElement('div');5  container.id = 'container';6  root.appendChild(container);7  ReactDOM.render(<div>Test</div>, container);8});9await page.evaluate(() => {10  const root = document.getElementById('root');11  const container = document.getElementById('container');12  const work = ReactDOM.unmountComponentAtNode(container);13  console.log(work);14  root.removeChild(container);15});16console.log("Hello");17await page.evaluate(() => {18  const root = document.getElementById('root');19  const container = document.createElement('div');20  container.id = 'container';21  root.appendChild(container);22  ReactDOM.render(<div>Test</div>, container);23});24await page.evaluate(() => {25  const root = document.getElementById('root');26  const container = document.getElementById('container');27  const work = ReactDOM.unmountComponentAtNode(container);28  console.log(work);29  root.removeChild(container);30});31console.log("Hello");32await page.evaluate(() => {33  const root = document.getElementById('root');34  const container = document.createElement('div');35  container.id = 'container';36  root.appendChild(container);37  ReactDOM.render(<div>Test</div>, container);38});39await page.evaluate(() => {40  const root = document.getElementById('root');41  const container = document.getElementById('container');42  const work = ReactDOM.unmountComponentAtNode(container);43  console.log(work);44  root.removeChild(container);45});46console.log("Hello");47await page.evaluate(() => {48  const root = document.getElementById('root');49  const container = document.createElement('div');50  container.id = 'container';51  root.appendChild(container);52  ReactDOM.render(<div>Test</div>, container);53});54await page.evaluate(() => {55  const root = document.getElementById('root');56  const container = document.getElementById('container');57  const work = ReactDOM.unmountComponentAtNode(container);58  console.log(work);59  root.removeChild(container);60});61console.log("Hello");62await page.evaluate(() => {63  const root = document.getElementById('root');64  const container = document.createElement('div');

StackOverFlow community discussions

Questions

Discussion

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

firefox browser does not start in playwright

Running Playwright in Azure Function

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

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

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

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

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

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If you are a web tester then somewhere down the road you will have to come across Selenium, an open-source test automation framework that has been on boom ever since its launch in 2004.

Getting Rid of Technical Debt in Agile Projects

Technical debt was originally defined as code restructuring, but in today’s fast-paced software delivery environment, it has evolved. Technical debt may be anything that the software development team puts off for later, such as ineffective code, unfixed defects, lacking unit tests, excessive manual tests, or missing automated tests. And, like financial debt, it is challenging to pay back.

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.