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How to use attachTracker method in Playwright Internal

Best JavaScript code snippet using playwright-internal

reify-8f11c8f064aa7a7fc0028b7b3c2145ce110bf540.js

Source: reify-8f11c8f064aa7a7fc0028b7b3c2145ce110bf540.js

...14}15function getTracker(inst) {16  return inst._wrapperState.valueTracker;17}18function attachTracker(inst, tracker) {19  inst._wrapperState.valueTracker = tracker;20}21function detachTracker(inst) {22  inst._wrapperState.valueTracker = null;23}24function getValueFromNode(node) {25  var value;26  if (node) {27    value = isCheckable(node) ? '' + node.checked : node.value;28  }29  return value;30}31var inputValueTracking = {32  // exposed for testing33  _getTrackerFromNode: function (node) {34    return getTracker(ReactDOMComponentTree.getInstanceFromNode(node));35  },36  track: function (inst) {37    if (getTracker(inst)) {38      return;39    }40    var node = ReactDOMComponentTree.getNodeFromInstance(inst);41    var valueField = isCheckable(node) ? 'checked' : 'value';42    var descriptor = Object.getOwnPropertyDescriptor(node.constructor.prototype, valueField);43    var currentValue = '' + node[valueField];44    // if someone has already defined a value or Safari, then bail45    // and don't track value will cause over reporting of changes,46    // but it's better then a hard failure47    // (needed for certain tests that spyOn input values and Safari)48    if (node.hasOwnProperty(valueField) || typeof descriptor.get !== 'function' || typeof descriptor.set !== 'function') {49      return;50    }51    Object.defineProperty(node, valueField, {52      enumerable: descriptor.enumerable,53      configurable: true,54      get: function () {55        return descriptor.get.call(this);56      },57      set: function (value) {58        currentValue = '' + value;59        descriptor.set.call(this, value);60      }61    });62    attachTracker(inst, {63      getValue: function () {64        return currentValue;65      },66      setValue: function (value) {67        currentValue = '' + value;68      },69      stopTracking: function () {70        detachTracker(inst);71        delete node[valueField];72      }73    });74  },75  updateValueIfChanged: function (inst) {76    if (!inst) {...

inputValueTracking.js

Source:inputValueTracking.js

...8}9function getTracker(inst) {10  return inst._wrapperState.valueTracker;11}12function attachTracker(inst, tracker) {13  inst._wrapperState.valueTracker = tracker;14}15function detachTracker(inst) {16  inst._wrapperState.valueTracker = null;17}18function getValueFromNode(node) {19  var value;20  if (node) {21    value = isCheckable(node) ? '' + node.checked : node.value;22  }23  return value;24}25var inputValueTracking = {26  _getTrackerFromNode: function(node) {27    return getTracker(ReactDOMComponentTree.getInstanceFromNode(node));28  },29  track: function(inst) {30    if (getTracker(inst)) {31      return;32    }33    var node = ReactDOMComponentTree.getNodeFromInstance(inst);34    var valueField = isCheckable(node) ? 'checked' : 'value';35    var descriptor = Object.getOwnPropertyDescriptor(node.constructor.prototype, valueField);36    var currentValue = '' + node[valueField];37    if (node.hasOwnProperty(valueField) || typeof descriptor.get !== 'function' || typeof descriptor.set !== 'function') {38      return;39    }40    Object.defineProperty(node, valueField, {41      enumerable: descriptor.enumerable,42      configurable: true,43      get: function() {44        return descriptor.get.call(this);45      },46      set: function(value) {47        currentValue = '' + value;48        descriptor.set.call(this, value);49      }50    });51    attachTracker(inst, {52      getValue: function() {53        return currentValue;54      },55      setValue: function(value) {56        currentValue = '' + value;57      },58      stopTracking: function() {59        detachTracker(inst);60        delete node[valueField];61      }62    });63  },64  updateValueIfChanged: function(inst) {65    if (!inst) {...

tracker.js

Source: tracker.js

...25      'Content-Type': 'text/plain'26    }27  });28}29function attachTracker(buttonEl) {30  buttonEl.onclick = (e) => {31    doTrack(buttonEl.id);32  }33}34window.addEventListener('DOMContentLoaded', (e) => {35  console.log('DOM fully loaded and parsed');36  console.log('Attaching tracker to  buttons');37  const buttonEls = window.document.querySelectorAll("button");38  for (let i = 0; i < buttonEls.length; i++) {39    console.log(buttonEls[i]);40    attachTracker(buttonEls[i]);41  }...

Using AI Code Generation

1const playwright = require('playwright');2(async () => {3  const browser = await playwright.chromium.launch({4  });5  const page = await browser.newPage();6  await page.screenshot({ path: `example.png` });7  await browser.close();8})();9const playwright = require('playwright');10(async () => {11  const browser = await playwright.chromium.launch({12  });13  const page = await browser.newPage();14  await page.screenshot({ path: `example.png` });15  await browser.close();16})();17const playwright = require('playwright');18(async () => {19  const browser = await playwright.chromium.launch({20  });21  const page = await browser.newPage();22  await page.screenshot({ path: `example.png` });23  await browser.close();24})();25const playwright = require('playwright');26(async () => {27  const browser = await playwright.chromium.launch({28  });29  const page = await browser.newPage();30  await page.screenshot({ path: `example.png` });31  await browser.close();32})();33const playwright = require('playwright');34(async () => {35  const browser = await playwright.chromium.launch({36  });37  const page = await browser.newPage();38  await page.screenshot({ path: `example.png` });39  await browser.close();40})();41const playwright = require('playwright');42(async () => {43  const browser = await playwright.chromium.launch({44  });45  const page = await browser.newPage();46  await page.screenshot({ path: `example.png` });47  await browser.close();48})();49const playwright = require('

Using AI Code Generation

1const { attachTracker } = require('playwright-core/lib/server/trace/recorder');2const { chromium } = require('playwright-core');3(async () => {4  const browser = await chromium.launch({ headless: false });5  const context = await browser.newContext();6  const page = await context.newPage();7  attachTracker(page);8  await page.screenshot({ path: 'example.png' });9  await browser.close();10})();11const { attachTracker } = require('playwright-core/lib/server/trace/recorder');12const { chromium } = require('playwright-core');13describe('My First Test', () => {14  it('Does not do much!', () => {15    expect(true).to.equal(true)16  })17})18module.exports = (on, config) => {19  on('task', {20    async startBrowser () {21      const browser = await chromium.launch({ headless: false });22      const context = await browser.newContext();23      const page = await context.newPage();24      attachTracker(page);25      await page.screenshot({ path: 'example.png' });26      await browser.close();27    }28  })29}

Using AI Code Generation

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

Using AI Code Generation

1const { attachTracker } = require('playwright-core/lib/server/supplements/recorder/recorderSupplement');2const { chromium } = require('playwright-core');3(async () => {4    const browser = await chromium.launch();5    const context = await browser.newContext();6    const page = await context.newPage();7    await attachTracker({ page });8    await page.click('text=Google Search');9    await page.click('input[name="q"]');10    await page.fill('input[name="q"]', 'Hello World');11    await page.click('text=Google Search');12    await page.click('input[name="q"]');13    await page.fill('input[name="q"]', 'Hello World');14    await page.click('text=Google Search');15    await page.click('input[name="q"]');16    await page.fill('input[name="q"]', 'Hello World');17    await page.click('text=Google Search');18    await page.click('input[name="q"]');19    await page.fill('input[name="q"]', 'Hello World');20    await page.click('text=Google Search');21    await page.click('input[name="q"]');22    await page.fill('input[name="q"]', 'Hello World');23    await page.click('text=Google Search');24    await page.click('input[name="q"]');25    await page.fill('input[name="q"]', 'Hello World');26    await page.click('text=Google Search');27    await page.click('input[name="q"]');28    await page.fill('input[name="q"]', 'Hello World');29    await page.click('text=Google Search');30    await page.click('input[name="q"]');31    await page.fill('input[name="q"]', 'Hello World');32    await page.click('text=Google Search');33    await page.click('input[name="q"]');34    await page.fill('input[name="q"]', 'Hello World');35    await page.click('text=Google Search');36    await page.click('input[name="q"]');37    await page.fill('input[name="q"]', 'Hello World');38    await page.click('text=Google Search');39    await page.click('input[name="q"]');40    await page.fill('input[name="q"]', 'Hello World');41    await page.click('text=Google Search');42    await page.click('input[name="q"]');43    await page.fill('input[name="q"]',

Using AI Code Generation

1const { attachTracker } = require('playwright-core/lib/server/supplements/tracing/tracker');2const { chromium } = require('playwright-core');3(async () => {4  const browser = await chromium.launch();5  const context = await browser.newContext();6  const page = await context.newPage();7  attachTracker(page);8  await page.screenshot({ path: 'example.png' });9  await browser.close();10})();11const { chromium } = require('playwright-core');12const { expect } = require('chai');13describe('Test', () => {14  it('should pass', async () => {15    const browser = await chromium.launch();16    const context = await browser.newContext();17    const page = await context.newPage();18    await page.screenshot({ path: 'example.png' });19    const trace = await page.tracing.stop({ path: 'trace.zip' });20    expect(trace).to.be.an('object');21    await browser.close();22  });23});24const { chromium } = require('playwright-core');25const { expect } = require('chai');26describe('Test', () => {27  it('should pass', async () => {28    const browser = await chromium.launch();29    const context = await browser.newContext();30    const page = await context.newPage();31    await page.screenshot({ path: 'example.png' });32    const trace = await page.tracing.stop({ path: 'trace.zip' });33    expect(trace).to.be.an('object');34    await browser.close();35  });36});37const { chromium } = require('playwright-core');38const { expect } = require('chai');39describe('Test', () => {40  it('should pass', async () => {41    const browser = await chromium.launch();42    const context = await browser.newContext();43    const page = await context.newPage();44    await page.screenshot({ path: 'example.png' });45    const trace = await page.tracing.stop({ path: 'trace.zip' });46    expect(trace).to.be.an('object');47    await browser.close();48  });49});50const {

Using AI Code Generation

1const { attachTracker } = require('playwright/lib/utils/attachLogger');2const { chromium } = require('playwright');3const browser = await chromium.launch();4const context = await browser.newContext();5attachTracker(context, 'context');6const page = await context.newPage();7attachTracker(page, 'page');8const { attachTracker } = require('playwright/lib/utils/attachLogger');9const { chromium } = require('playwright');10const browser = await chromium.launch();11const context = await browser.newContext();12attachTracker(context, 'context');13const page = await context.newPage();14attachTracker(page, 'page');15const { attachTracker } = require('playwright/lib/utils/attachLogger');16const { chromium } = require('playwright');17const browser = await chromium.launch();18const context = await browser.newContext();19attachTracker(context, 'context');20const page = await context.newPage();21attachTracker(page, 'page');22const { attachTracker } = require('playwright/lib/utils/attachLogger');23const { chromium } = require('playwright');24const browser = await chromium.launch();25const context = await browser.newContext();26attachTracker(context, 'context');27const page = await context.newPage();28attachTracker(page, 'page');29const { attachTracker } = require('playwright/lib/utils/attachLogger');30const { chromium } = require('playwright');31const browser = await chromium.launch();32const context = await browser.newContext();33attachTracker(context, 'context');34const page = await context.newPage();35attachTracker(page, 'page');36const { attachTracker } = require('playwright/lib/utils/attachLogger');37const { chromium } = require('playwright');38const browser = await chromium.launch();39const context = await browser.newContext();40attachTracker(context, 'context');41const page = await context.newPage();42attachTracker(page, 'page');43await page.goto('

Using AI Code Generation

1const { attachTracker, Page } = require('playwright');2const { attachTracker, Page } = require('playwright');3const { attachTracker, Page } = require('playwright');4const { attachTracker, Page } = require('playwright');5const { attachTracker, Page } = require('playwright');6const { attachTracker, Page } = require('playwright');7const { attachTracker, Page } = require('playwright');8const { attachTracker, Page } = require('playwright');9const { attachTracker, Page } = require('playwright');10const { attachTracker, Page } = require('playwright');11const { attachTracker, Page } = require('playwright');12const { attachTracker, Page } = require('playwright');13const { attachTracker, Page } = require('playwright');

Using AI Code Generation

1const { attachTracker } = require('@playwright/test/lib/runner');2attachTracker();3const { test } = require('@playwright/test');4test('first test', async ({ page }) => {5  const title = page.locator('text=Get started');6  await title.click();7  const title1 = page.locator('text=Test runner');8  await title1.click();9  const title2 = page.locator('text=Test runner');10  await title2.click();11});

StackOverFlow community discussions

Questions

Discussion

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

Running Playwright in Azure Function

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

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

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