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How to use _stopScreencast method in Playwright Internal

Best JavaScript code snippet using playwright-internal

AnimationModel.js

...699    this._requests = this._requests.filter(isAnimating);700    for (var request of this._requests)701      request.screenshots.push(base64Data);702  }703  _stopScreencast() {704    if (!this._capturing)705      return;706    delete this._stopTimer;707    delete this._endTime;708    this._requests = [];709    this._capturing = false;710    this._screenCaptureModel.stopScreencast();711  }712};713/** @typedef {{ endTime: number, screenshots: !Array.<string>}} */...

tracing.js

Source: tracing.js

...77        options: this._context._options78      };79      this._appendTraceEvent(event);80    }81    if (!(state !== null && state !== void 0 && (_state$options = state.options) !== null && _state$options !== void 0 && _state$options.screenshots) && options.screenshots) this._startScreencast();else if (state !== null && state !== void 0 && (_state$options2 = state.options) !== null && _state$options2 !== void 0 && _state$options2.screenshots && !options.screenshots) this._stopScreencast(); // context + page must be the first events added, no awaits above this line.82    await _fs.default.promises.mkdir(this._resourcesDir, {83      recursive: true84    });85    if (!state) this._context.instrumentation.addListener(this);86    await this._appendTraceOperation(async () => {87      var _state$options3, _state$options4;88      if (options.snapshots && state !== null && state !== void 0 && (_state$options3 = state.options) !== null && _state$options3 !== void 0 && _state$options3.snapshots) {89        // Reset snapshots to avoid back-references.90        await this._snapshotter.reset();91      } else if (options.snapshots) {92        await this._snapshotter.start();93      } else if (state !== null && state !== void 0 && (_state$options4 = state.options) !== null && _state$options4 !== void 0 && _state$options4.snapshots) {94        await this._snapshotter.stop();95      }96      if (state) {97        state.lastReset++;98        const markerEvent = {99          type: 'marker',100          resetIndex: state.lastReset101        };102        await _fs.default.promises.appendFile(state.traceFile, JSON.stringify(markerEvent) + '\n');103      }104    });105    if (this._recording) this._recording.options = options;106  }107  _startScreencast() {108    for (const page of this._context.pages()) this._startScreencastInPage(page);109    this._screencastListeners.push(_eventsHelper.eventsHelper.addEventListener(this._context, _browserContext.BrowserContext.Events.Page, this._startScreencastInPage.bind(this)));110  }111  _stopScreencast() {112    _eventsHelper.eventsHelper.removeEventListeners(this._screencastListeners);113    for (const page of this._context.pages()) page.setScreencastOptions(null);114  }115  async stop() {116    if (!this._recording || this._isStopping) return;117    this._isStopping = true;118    this._context.instrumentation.removeListener(this);119    this._stopScreencast();120    await this._snapshotter.stop(); // Ensure all writes are finished.121    await this._writeChain;122    this._recording = undefined;123    this._isStopping = false;124  }125  async dispose() {126    this._snapshotter.dispose();127    await this._writeChain;128  }129  async export() {130    for (const {131      sdkObject,132      metadata,133      beforeSnapshot,...

VideoReporter.js

Source: VideoReporter.js

...132      removeVideo = 'try';133    } else {134      removeVideo = 'yes';135    }136    self._stopScreencast(removeVideo);137  } else if (self.options.createSubtitles) {138    self._currentSubtitle.endTime = new Date() - self._jasmineStartTime;139    140    var text = '';141    switch (result.status) {142      case 'passed':143        text += '<font color="green">SUCCESS</font>';144        break;145      case 'failed':146        text += '<font color="red">FAILED</font>';147        break;148      case 'pending':149        text += '<font color="yellow">PENDING</font>';150        break;151    }152    text += ' ' + result.description;153    self._currentSubtitle.text = text;154    self._subtitles.push(self._currentSubtitle);155  }156};157VideoReporter.prototype.jasmineStarted = function() {158  var self = this;159  if (self.options.singleVideo) {160    var videoPath = Path.join(self.options.baseDirectory, 'protractor-specs.mov');161    self._startScreencast(videoPath);162    if (self.options.createSubtitles) {163      self._subtitles = [];164      self._jasmineStartTime = new Date();165    }166  }167};168VideoReporter.prototype.jasmineDone = function() {169  var self = this;170  if (self.options.singleVideo) {171    self._stopScreencast('no');172    if (self.options.createSubtitles) {173      Fs.writeFileSync(174          Path.join(self.options.baseDirectory, 'protractor-specs.srt'),175          SubtitlesParser.toSrt(self._subtitles),176          'utf8'177      );178    }179  }180};...

Using AI Code Generation

1const playwright = require('playwright');2(async () => {3  const browser = await playwright.chromium.launch();4  const context = await browser.newContext();5  const page = await context.newPage();6  await page._client.send('Page.startScreencast');7  await page._client.send('Page.stopScreencast');8  await browser.close();9})();10const playwright = require('playwright');11(async () => {12  const browser = await playwright.chromium.launch();13  const context = await browser.newContext();14  const page = await context.newPage();15  await page._client.send('Page.startScreencast', {format: 'png', everyNthFrame: 1});16  await page._client.send('Page.stopScreencast');17  await browser.close();18})();19const playwright = require('playwright');20(async () => {21  const browser = await playwright.chromium.launch();22  const context = await browser.newContext();23  const page = await context.newPage();24  await page._client.send('Page.startScreencast', {format: 'jpeg', everyNthFrame: 1});25  await page._client.send('Page.stopScreencast');26  await browser.close();27})();28const playwright = require('playwright

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  await page._stopScreencast();7  await browser.close();8})();9const { chromium } = require('playwright');10(async () => {11  const browser = await chromium.launch({ headless: false });12  const context = await browser.newContext();13  const page = await context.newPage();14  await page._startScreencast({15  });16  await browser.close();17})();18const { chromium } = require('playwright');19(async () => {20  const browser = await chromium.launch({ headless: false });21  const context = await browser.newContext();22  const page = await context.newPage();23  await page._screencastFrameAck({ sessionId: 1 });24  await browser.close();25})();26const { chromium } = require('playwright');27(async () => {28  const browser = await chromium.launch({ headless: false });29  const context = await browser.newContext();30  const page = await context.newPage();31  await page._takeHeapSnapshot({ reportProgress: true });32  await browser.close();33})();34const { chromium } = require('playwright');35(async () => {36  const browser = await chromium.launch({ headless: false });37  const context = await browser.newContext();38  const page = await context.newPage();39  await page._getHeapSnapshot({ reportProgress: true });40  await browser.close();

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._client.send('Page.startScreencast');7  await page._client.send('Page.stopScreencast');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  await page._client.send('Page.startScreencast');16  await browser.close();17})();18const {chromium} = require('playwright');19(async () => {20  const browser = await chromium.launch();21  const context = await browser.newContext();22  const page = await context.newPage();23  await page._client.send('Page.startScreencast');24  await page._client.send('Page.stopScreencast');25  await browser.close();26})();27const {chromium} = require('playwright');28(async () => {29  const browser = await chromium.launch();30  const context = await browser.newContext();31  const page = await context.newPage();32  await page._client.send('Page.startScreencast');33  await page._client.send('Page.stopScreencast');34  await browser.close();35})();36const {chromium} = require('playwright');37(async () => {38  const browser = await chromium.launch();39  const context = await browser.newContext();40  const page = await context.newPage();41  await page._client.send('Page.startScreencast');

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._client.send('Page.startScreencast', { format: 'jpeg', everyNthFrame: 1 });7  await page._client.send('Page.stopScreencast');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  await page._client.send('Page.startScreencast', { format: 'jpeg', everyNthFrame: 1 });16  await page._client.send('Page.stopScreencast');17  await browser.close();18})();19const { chromium } = require('playwright');20(async () => {21  const browser = await chromium.launch();22  const context = await browser.newContext();23  const page = await context.newPage();24  await page._client.send('Page.startScreencast', { format: 'jpeg', everyNthFrame: 1 });25  await page._client.send('Page.stopScreencast');26  await browser.close();27})();28const { chromium } = require('playwright');29(async () => {30  const browser = await chromium.launch();31  const context = await browser.newContext();32  const page = await context.newPage();33  await page._client.send('Page.startScreencast', { format: 'jpeg', everyNthFrame: 1 });34  await page._client.send('Page.stopScreencast');35  await browser.close();36})();37const { chromium } = require('playwright');38(async () => {39  const browser = await chromium.launch();40  const context = await browser.newContext();41  const page = await context.newPage();42  await page._client.send('Page.startScreencast

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})();

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    const screencast = await page._startScreencast();7    console.log(screencast);8    await page._stopScreencast();9    await browser.close();10})();11{12  _page: Page {13    _browserContext: BrowserContext {14    },15    _timeoutSettings: TimeoutSettings { _defaultTimeout: 30000 },16    _keyboard: Keyboard { _page: [Circular] },17    _mouse: Mouse { _page: [Circular] },18    _touchscreen: Touchscreen { _page: [Circular] },19    _crPage: CRPage {

Using AI Code Generation

1const { chromium } = require('playwright');2const browser = await chromium.launch();3const context = await browser.newContext();4const page = await context.newPage();5await page._stopScreencast();6await browser.close();7    at CDPSession.send (C:\Users\Arun\Desktop\Playwright\Playwright\playwright\lib\client\cdpSession.js:51:19)8    at async CDPSession.sendMayFail (C:\Users\Arun\Desktop\Playwright\Playwright\playwright\lib\client\cdpSession.js:59:16)9    at async Page._stopScreencast (C:\Users\Arun\Desktop\Playwright\Playwright\playwright\lib\client\page.js:172:5)10const { chromium } = require('playwright');11const browser = await chromium.launch();12const context = await browser.newContext();13const page = await context.newPage();14await page.screenshot({ path: 'example.png' });15await browser.close();

Using AI Code Generation

1const { _stopScreencast } = require('playwright/lib/server/chromium/crBrowser');2const browser = await chromium.launch();3const page = await browser.newPage();4await _stopScreencast(page);5const { _startScreencast } = require('playwright/lib/server/chromium/crBrowser');6const browser = await chromium.launch();7const page = await browser.newPage();8await _startScreencast(page, { format: 'png' });9const { _screencastFrameAck } = require('playwright/lib/server/chromium/crBrowser');10const browser = await chromium.launch();11const page = await browser.newPage();12await _screencastFrameAck(page, { sessionId: 2, pageScaleFactor: 1, offsetTop: 0, deviceWidth: 1280, deviceHeight: 720, scrollOffsetX: 0, scrollOffsetY: 0, screenWidth: 1280, screenHeight: 720, positionX: 0, positionY: 0, timestamp: 1591378426191.657, sessionId: 2 });13const { _screencastFrame } = require('playwright/lib/server/chromium/crBrowser');14const browser = await chromium.launch();15const page = await browser.newPage();16await _screencastFrame(page, { sessionId: 2, pageScaleFactor: 1, offsetTop: 0, deviceWidth: 1280, deviceHeight: 720, scrollOffsetX: 0, scrollOffsetY: 0, screenWidth: 1280, screenHeight: 720, positionX: 0, positionY: 0, timestamp: 1591378426191.657, sessionId: 2 });17const { _startScreencast } = require('playwright/lib/server/chromium/crBrowser');18const browser = await chromium.launch();19const page = await browser.newPage();20await _startScreencast(page, { format: 'png' });

Using AI Code Generation

1const playwright = require('playwright');2(async () => {3  const browser = await playwright.chromium.launch();4  const context = await browser.newContext();5  const page = await context.newPage();6  await page._startScreencast({format: 'png', everyNthFrame: 1});7  await browser.close();8})();9const playwright = require('playwright');10(async () => {11  const browser = await playwright.chromium.launch();12  const context = await browser.newContext();13  const page = await context.newPage();14  await page._stopScreencast();15  await browser.close();16})();17const playwright = require('playwright');18(async () => {19  const browser = await playwright.chromium.launch();20  const context = await browser.newContext();21  const page = await context.newPage();22  await page._startScreencast({format: 'png', everyNthFrame: 1});23  await page._stopScreencast();24  await page._saveScreencastFrame({path: 'video.mp4'});25  await browser.close();26})();27const playwright = require('playwright');28(async () => {29  const browser = await playwright.chromium.launch();30  const context = await browser.newContext();31  const page = await context.newPage();

Using AI Code Generation

1const { chromium } = require('playwright');2const page = await client.newPage();3await page._stopScreencast();4await page.close();5await client.close();6    at CDPSession.send (C:\Users\user\playwright\playwright\lib\cdp.js:116:23)7    at CDPSession.send (C:\Users\user\playwright\playwright\lib\cdp.js:109:28)8    at Page._stopScreencast (C:\Users\user\playwright\playwright\lib\page.js:1051:25)9    at processTicksAndRejections (internal/process/task_queues.js:97:5)10    at async Object.<anonymous> (C:\Users\user\playwright\playwright\lib\test.js:6:3)11const { chromium } = require('playwright');

StackOverFlow community discussions

Questions

Discussion

Running Playwright in Azure Function

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

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?

I played with your example for a while and I got the same errors. These are the things I found that made my example work:

It must be Linux. I know that you mentioned that you picked a Linux plan. But I found that in VS Code that part is hidden, and on the Web the default is Windows. This is important because only the Linux plan runs npm install on the server.

Make sure that you are building on the server. You can find this option in the VS Code Settings:

Make sure you set the environment variable PLAYWRIGHT_BROWSERS_PATH, before making the publish.

https://stackoverflow.com/questions/63949978/running-playwright-in-azure-function

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

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

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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There is just one area where each member of the software testing community has a distinct point of view! Metrics! This contentious issue sparks intense disputes, and most conversations finish with no definitive conclusion. It covers a wide range of topics: How can testing efforts be measured? What is the most effective technique to assess effectiveness? Which of the many components should be quantified? How can we measure the quality of our testing performance, among other things?

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:

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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.