KaneAI - World’s First E2E Software Testing Agent.Book a Demo Join TestMu Conference

How to use unstable_shouldYield method in Playwright Internal

Best JavaScript code snippet using playwright-internal

scheduler.profiling.min.js

Source:scheduler.profiling.min.js

...33      this,34      arguments35    );36  }37  function unstable_shouldYield() {38    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_shouldYield.apply(39      this,40      arguments41    );42  }43  function unstable_runWithPriority() {44    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_runWithPriority.apply(45      this,46      arguments47    );48  }49  function unstable_wrapCallback() {50    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_wrapCallback.apply(51      this,...

scheduler.production.min.js

Source:scheduler.production.min.js

...33      this,34      arguments35    );36  }37  function unstable_shouldYield() {38    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_shouldYield.apply(39      this,40      arguments41    );42  }43  function unstable_runWithPriority() {44    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_runWithPriority.apply(45      this,46      arguments47    );48  }49  function unstable_wrapCallback() {50    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_wrapCallback.apply(51      this,...

scheduler.development.js

Source:scheduler.development.js

...32      this,33      arguments34    );35  }36  function unstable_shouldYield() {37    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_shouldYield.apply(38      this,39      arguments40    );41  }42  function unstable_runWithPriority() {43    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_runWithPriority.apply(44      this,45      arguments46    );47  }48  function unstable_wrapCallback() {49    return global.React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED.Scheduler.unstable_wrapCallback.apply(50      this,...

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch({ headless: false });4  const context = await browser.newContext();5  const page = await context.newPage();6  while (page.mainFrame()._internal.unstable_shouldYield()) {7    await page.mainFrame()._internal.unstable_continue();8  }9  await page.waitForLoadState();10  await browser.close();11})();12const { chromium, firefox, webkit } = require('playwright');13(async () => {14  const browser1 = await chromium.launch();15  const browser2 = await firefox.launch();16  const browser3 = await webkit.launch();17})();18const { chromium } = require('playwright');19(async () => {20  const browser = await chromium.launch({ headless: false });21  const context = await browser.newContext({ recordVideo: { dir: 'videos/' } });22  const page = await context.newPage();23  await page.screenshot({ path: `example.png` });24  await browser.close();25})();26const { chromium } = require('playwright');27const { expect } = require('@playwright/test');28(async () => {29  const browser = await chromium.launch({ headless: false });30  const context = await browser.newContext({ recordVideo: { dir: 'videos/' } });31  const page = await context.newPage();32  await expect(page).toHaveText('Playwright');33  await browser.close();34})();

Using AI Code Generation

1const { chromium } = require('playwright');2const path = require('path');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  await page.waitForSelector('input[name="q"]');8  await page.fill('input[name="q"]', 'Playwright');9  await page.keyboard.press('Enter');10  await page.waitForSelector('text=Playwright - Google Search');11  const internalApi = page._delegate;12  const internalFrame = internalApi._mainFrame;13  const internalLoader = internalFrame._loader;14  const internalNetworkManager = internalLoader._networkManager;15  const internalRequest = internalNetworkManager._requestIdToRequest.get('0x2');16  const internalResponse = internalRequest._response;17  const internalResponseBody = internalResponse._body;18  const internalResponseBodyStream = internalResponseBody._stream;19  var result = '';20  internalResponseBodyStream.on('data', function (chunk) {21    result += chunk.toString('utf8');22  });23  await new Promise(resolve => internalResponseBodyStream.on('end', resolve));24  console.log(result);25})();

Using AI Code Generation

1const { Playwright } = require('playwright');2const { chromium } = Playwright;3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  await page.click('text=Get started');8  await page.waitForSelector('text=Example repositories');9  await page.click('text=Example repositories');10  await page.waitForSelector('text=Create a new repository');11  await page.click('text=Create a new repository');12  await page.waitForSelector('text=Name your repository');13  await page.fill('text=Name your repository', 'playwright-test');14  await page.click('text=Create repository');15  await page.waitForSelector('text=README.md');16  await page.click('text=README.md');17  await page.fill('text=README.md', '## Playwright Test');18  await page.click('text=Commit new file');19  await page.waitForSelector('text=README.md');20  await page.click('text=README.md');21  await page.fill('text=README.md', '## Playwright Test');22  await page.click('text=Commit changes');23  await page.waitForSelector('text=README.md');24  await page.click('text=README.md');25  await page.fill('text=README.md', '## Playwright Test');26  await page.click('text=Commit changes');27  await page.waitForSelector('text=README.md');28  await page.click('text=README.md');29  await page.fill('text=README.md', '## Playwright Test');30  await page.click('text=Commit changes');31  await page.waitForSelector('text=README.md');32  await page.click('text=README.md');33  await page.fill('text=README.md', '## Playwright Test');34  await page.click('text=Commit changes');35  await page.waitForSelector('text=README.md');36  await page.click('text=README.md');37  await page.fill('text=README.md', '## Playwright Test');38  await page.click('text=Commit changes');39  await page.waitForSelector('text=README.md');40  await page.click('text=README.md');41  await page.fill('text=README.md', '## Playwright Test');42  await page.click('text=Commit changes');43  await page.waitForSelector('text=README.md');

Using AI Code Generation

1const { internal } = 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.click('text=Sign in');7    await page.fill('#identifierId', '

Using AI Code Generation

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

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 internalPage = page._delegate;7internalPage.unstable_shouldYield = () => {8  return true;9};10await browser.close();11const { Playwright } = require('playwright');12const playwright = new Playwright();13const browser = await playwright.chromium.launch();14const context = await browser.newContext();15const page = await context.newPage();16const internalPage = page._delegate;17internalPage.unstable_shouldYield = () => {18  return true;19};20await browser.close();21const { Playwright } = require('playwright');22const playwright = new Playwright();23const browser = await playwright.chromium.launch();24const context = await browser.newContext();25const page = await context.newPage();26const internalPage = page._delegate;27internalPage.unstable_shouldYield = () => {28  return true;29};30await browser.close();31const { Playwright } = require('playwright');32const playwright = new Playwright();33const browser = await playwright.chromium.launch();34const context = await browser.newContext();35const page = await context.newPage();36const internalPage = page._delegate;37internalPage.unstable_shouldYield = () => {38  return true;39};40await browser.close();41const { Playwright } = require('playwright');42const playwright = new Playwright();43const browser = await playwright.chromium.launch();44const context = await browser.newContext();45const page = await context.newPage();46const internalPage = page._delegate;47internalPage.unstable_shouldYield = () => {48  return true;49};50await browser.close();

Using AI Code Generation

1const {InternalAPI} = require('playwright/lib/internal/api');2const api = new InternalAPI();3const {shouldYield} = api.unstable_shouldYield();4if (shouldYield()) {5  console.log('shouldYield returned true');6} else {7  console.log('shouldYield returned false');8}9{10  "scripts": {11  },12  "dependencies": {13  }14}

Using AI Code Generation

1const { PlaywrightInternal } = require('playwright/internal/playwright');2const { Playwright } = require('playwright');3const { chromium } = require('playwright');4(async () => {5  const browser = await chromium.launch();6  const context = await browser.newContext();7  const page = await context.newPage();8  const internal = PlaywrightInternal.from(browser);9  internal.unstable_shouldYield();10  await page.screenshot({ path: 'example.png' });11  await browser.close();12})();13const { chromium } = require('playwright');14(async () => {15  const browser = await chromium.launch();16  const context = await browser.newContext();17  const page = await context.newPage();18  page.unstable_shouldYield();19  await page.screenshot({ path: 'example.png' });20  await browser.close();21})();

Using AI Code Generation

1const playwright = require('playwright');2(async () => {3  const browser = await playwright.chromium.launch();4  const page = await browser.newPage();5  await page.screenshot({ path: 'screenshot.png' });6  await browser.close();7})();8{9  "scripts": {10  },11  "dependencies": {12  }13}

StackOverFlow community discussions

Questions

Discussion

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

firefox browser does not start in playwright

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

firefox browser does not start in playwright

Running Playwright in Azure Function

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

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

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

Blogs

Check out the latest blogs from LambdaTest on this topic:

Top 17 Resources To Learn Test Automation

Lack of training is something that creates a major roadblock for a tester. Often, testers working in an organization are all of a sudden forced to learn a new framework or an automation tool whenever a new project demands it. You may be overwhelmed on how to learn test automation, where to start from and how to master test automation for web applications, and mobile applications on a new technology so soon.

How to Position Your Team for Success in Estimation

Estimates are critical if you want to be successful with projects. If you begin with a bad estimating approach, the project will almost certainly fail. To produce a much more promising estimate, direct each estimation-process issue toward a repeatable standard process. A smart approach reduces the degree of uncertainty. When dealing with presales phases, having the most precise estimation findings can assist you to deal with the project plan. This also helps the process to function more successfully, especially when faced with tight schedules and the danger of deviation.

Three Techniques for Improved Communication and Testing

Anyone who has worked in the software industry for a while can tell you stories about projects that were on the verge of failure. Many initiatives fail even before they reach clients, which is especially disheartening when the failure is fully avoidable.

And the Winner Is: Aggregate Model-based Testing

In my last blog, I investigated both the stateless and the stateful class of model-based testing. Both have some advantages and disadvantages. You can use them for different types of systems, depending on whether a stateful solution is required or a stateless one is enough. However, a better solution is to use an aggregate technique that is appropriate for each system. Currently, the only aggregate solution is action-state testing, introduced in the book Paradigm Shift in Software Testing. This method is implemented in Harmony.

Oct’22 Updates: New Analytics And App Automation Dashboard, Test On Google Pixel 7 Series, And More

Hey everyone! We hope you had a great Hacktober. At LambdaTest, we thrive to bring you the best with each update. Our engineering and tech teams work at lightning speed to deliver you a seamless testing experience.

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.