Discover AI-native insights at Testμ Conference‘25

How to use onErrorCaptured method in Playwright Internal

Best JavaScript code snippet using playwright-internal

no-lifecycle-after-await.js

...46        async setup() {47          onBeforeMount(() => { /* ... */ })48          onBeforeUnmount(() => { /* ... */ })49          onBeforeUpdate(() => { /* ... */ })50          onErrorCaptured(() => { /* ... */ })51          onMounted(() => { /* ... */ })52          onRenderTracked(() => { /* ... */ })53          onRenderTriggered(() => { /* ... */ })54          onUnmounted(() => { /* ... */ })55          onUpdated(() => { /* ... */ })56          onActivated(() => { /* ... */ })57          onDeactivated(() => { /* ... */ })58          await doSomething()59        }60      }61      </script>62      `63    },64    {65      filename: 'test.vue',66      code: `67      <script>68      import {onMounted} from 'vue'69      export default {70        async _setup() {71          await doSomething()72          onMounted(() => { /* ... */ }) // error73        }74      }75      </script>76      `77    },78    // has target79    {80      filename: 'test.vue',81      code: `82      <script>83      import {onBeforeMount, onBeforeUnmount, onBeforeUpdate, onErrorCaptured, onMounted, onRenderTracked, onRenderTriggered, onUnmounted, onUpdated, onActivated, onDeactivated} from 'vue'84      export default {85        async setup() {86          await doSomething()87          onBeforeMount(() => { /* ... */ }, instance)88          onBeforeUnmount(() => { /* ... */ }, instance)89          onBeforeUpdate(() => { /* ... */ }, instance)90          onErrorCaptured(() => { /* ... */ }, instance)91          onMounted(() => { /* ... */ }, instance)92          onRenderTracked(() => { /* ... */ }, instance)93          onRenderTriggered(() => { /* ... */ }, instance)94          onUnmounted(() => { /* ... */ }, instance)95          onUpdated(() => { /* ... */ }, instance)96          onActivated(() => { /* ... */ }, instance)97          onDeactivated(() => { /* ... */ }, instance)98        }99      }100      </script>101      `102    }103  ],104  invalid: [105    {106      filename: 'test.vue',107      code: `108      <script>109      import {onMounted} from 'vue'110      export default {111        async setup() {112          await doSomething()113          onMounted(() => { /* ... */ }) // error114        }115      }116      </script>117      `,118      errors: [119        {120          message:121            'The lifecycle hooks after `await` expression are forbidden.',122          line: 8,123          column: 11,124          endLine: 8,125          endColumn: 41126        }127      ]128    },129    {130      filename: 'test.vue',131      code: `132      <script>133      import {onBeforeMount, onBeforeUnmount, onBeforeUpdate, onErrorCaptured, onMounted, onRenderTracked, onRenderTriggered, onUnmounted, onUpdated, onActivated, onDeactivated} from 'vue'134      export default {135        async setup() {136          await doSomething()137          onBeforeMount(() => { /* ... */ })138          onBeforeUnmount(() => { /* ... */ })139          onBeforeUpdate(() => { /* ... */ })140          onErrorCaptured(() => { /* ... */ })141          onMounted(() => { /* ... */ })142          onRenderTracked(() => { /* ... */ })143          onRenderTriggered(() => { /* ... */ })144          onUnmounted(() => { /* ... */ })145          onUpdated(() => { /* ... */ })146          onActivated(() => { /* ... */ })147          onDeactivated(() => { /* ... */ })148        }149      }150      </script>151      `,152      errors: [153        {154          messageId: 'forbidden',...

index.js

Source: index.js

...57        onBeforeUnmount(() => console.log(`setup() => (æ°) onBeforeUnmount`)),58        onUnmounted(() => console.log(`setup() => (æ°) onUnmounted`)),59        onActivated(() => console.log(`setup() => (æ°) onActivated`)),60        onDeactivated(() => console.log(`setup() => (æ°) onDeactivated`)),61        onErrorCaptured(() => console.log(`setup() => (æ°) onErrorCaptured`))62    },...

lifecycles.spec.js

Source: lifecycles.spec.js

...120    setup() {121      onMounted(() => {122        document.body.querySelector('button').click()123      })124      onErrorCaptured((err, component, details) => {125        expect(err.messsage === 'from method')126        done()127        return false128      })129    }130  }).$mount()131})132test('onBeforeUpdate and onUpdated', done => {133  new Vue({134    setup() {135      const msg = value('hello')136      onMounted(() => {137        expect(this.msg.value).toBe('hello')138        nextTick(() => {...

actions.js

Source: actions.js

...15    });16    // async await is equivalent to the .then method, response will be created only once we received the response17    // const responseData = await response.json();18    if (!response.ok) {19      const error = new onErrorCaptured(response.data.message || 'Failed to create coach');20      throw error;21    }22    context.commit('registerCoach', {23      ...coachData,24      id: userId25    });26  },27  async loadCoaches(context, payload) {28    if (!payload.forceRefresh && !context.getters.shouldUpdate) { // if update was less than a minute ago, don't update 29      return; 30    }31    const response = await fetch('https://vue-coach-finder-app-default-rtdb.europe-west1.firebasedatabase.app/coaches.json');32    const responseData = await response.json();33    if (!response.ok) {34      const error = new onErrorCaptured(response.data.message || 'Failed to fetch');35      throw error;36    }37    const coaches = [];38    for (const key in responseData) {39      const coach = {40        id: key,41        firstName: responseData[key].firstName,42        lastName: responseData[key].lastName,43        description: responseData[key].description,44        hourlyRate: responseData[key].hourlyRate,45        areas: responseData[key].areas46      };47      coaches.push(coach);48    }...

vue-life.js

Source: vue-life.js

...40  }) //41  onUpdated(() => {42    console.log(`${flag}-${index++} -- onUpdated`)43  }) //44  onErrorCaptured((errorMsg) => { // æ¸²æåºéæ¶45    console.log(`${flag}-${index++} -- onErrorCaptured`)46    console.log(errorMsg)47  }) //48  onRenderTracked((event) => { // æ¸²æè·è¸ªæ¶49    console.log(`${flag}-${index++} -- onRenderTracked`)50    console.log(event)51  }) //52  onRenderTriggered((event) => { // æ¸²æè§¦åæ¶53    console.log(`${flag}-${index++} -- onRenderTriggered`)54    console.log(event)55  }) //...

ErrorBoundary.js

Source: ErrorBoundary.js

...6} from '../../../../../../node_modules/vue_3/dist/vue.esm-browser.js';7export default {8  setup() {9    const error = ref(null);10    onErrorCaptured((err, instance, info) => {11      error.value = err;12      console.log('Component:', instance);13      console.log('Info:', info);14      // Stop the error from propagating.15      return false;16    });17    return { error };18  },19  template: `20    <div v-if="error" style="background: pink; color: red; padding-left: 0.5rem; overflow: hidden">21      <p>{{ error.message }}</p>22      <pre style="font-size: 0.5rem">{{ error.stack }}</pre>23    </div>24    <slot v-else />...

SuspenseWithErrors.js

Source: SuspenseWithErrors.js

2export default {3    name: 'SuspenseWithErrors',4    setup() {5        const error = ref(null);6        onErrorCaptured((err) => (error.value = err));7        return {8            error,9        };10    },11    template: `12    <slot name="error" :error="error" v-if="error" />13    <Suspense v-else>14      <template #default>15        <slot name="default" />16      </template>17      <template #fallback>18        <slot name="fallback" />19      </template>20    </Suspense>...

framework.js

Source: framework.js

1/**2 * Copyright (c) ActiveWidgets SARL. All Rights Reserved.3 * This source code is licensed under the MIT license found in the4 * LICENSE file in the root directory of this source tree.5 */67import adapter from '@activewidgets/frameworks/vue';8import {h, ref, nextTick, onMounted, onUpdated, onBeforeUnmount, onErrorCaptured, defineComponent} from 'vue';9
...

Using AI Code Generation

1const playwright = require('playwright');2(async () => {3  for (const browserType of ['chromium', 'firefox', 'webkit']) {4    const browser = await playwright[browserType].launch();5    const context = await browser.newContext();6    const page = await context.newPage();7    page.on('pageerror', async (err) => {8      console.log('Error: ', err);9    });10    page.on('error', async (err) => {11      console.log('Error: ', err);12    });13    page.on('requestfailed', async (req) => {14      console.log('Error: ', req.failure().errorText);15    });16    await page.waitForSelector('body');17    await browser.close();18  }19})();

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.on('error', err => {7    console.log('Error occurred: ', err);8  });9  await page.evaluate(() => {10    document.querySelector('not-existing').click();11  });12})();13const { chromium } = require('playwright');14(async () => {15  const browser = await chromium.launch({ headless: false });16  const context = await browser.newContext();17  const page = await context.newPage();18  await page.on('pageerror', err => {19    console.log('Error occurred: ', err);20  });21  await page.evaluate(() => {22    document.querySelector('not-existing').click();23  });24})();25const { chromium } = require('playwright');26(async () => {27  const browser = await chromium.launch({ headless: false });28  const context = await browser.newContext();29  const page = await context.newPage();30  await page.on('console', msg => {31    console.log('Error occurred: ', msg.text());32  });33  await page.evaluate(() => {34    document.querySelector('not-existing').click();35  });36})();37const { chromium } = require('playwright');38(async () => {39  const browser = await chromium.launch({ headless

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  page.on('pageerror', (err) => {7    console.log('pageerror', err);8  });9  page.on('requestfailed', (req) => {10    console.log('requestfailed', req.url(), req.failure().errorText);11  });12  await page.evaluate(() => {13    setTimeout(() => {14      throw new Error('this is an error');15    }, 1000);16  });17  await new Promise((res) => setTimeout(res, 2000));18  await browser.close();19})();20const { chromium } = require('playwright');21(async () => {22  const browser = await chromium.launch();23  const context = await browser.newContext();24  const page = await context.newPage();25  page.on('pageerror', (err) => {26    console.log('pageerror', err);27  });28  page.on('requestfailed', (req) => {29    console.log('requestfailed', req.url(), req.failure().errorText);30  });31  await page.evaluate(() => {32    setTimeout(() => {33      throw new Error('this is an error');34    }, 1000);35  });36  await new Promise((res) => setTimeout(res, 2000));37  await browser.close();38})();39const { chromium } = require('playwright');40(async () => {41  const browser = await chromium.launch();42  const context = await browser.newContext();43  const page = await context.newPage();44  page.on('pageerror', (err) => {45    console.log('pageerror', err);46  });47  page.on('requestfailed', (req) => {48    console.log('requestfailed

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  page.on('error', (error) => {7    console.log('Error in page', error);8  });9  await browser.close();10})();11process.on('unhandledRejection', (reason, promise) => {12  console.log('Unhandled Rejection at:', reason.stack || reason)13});14const { chromium } = require('playwright');15(async () => {16  const browser = await chromium.launch();17  const context = await browser.newContext();18  const page = await context.newPage();19  await browser.close();20})();21process.on('uncaughtException', (err, origin) => {22  console.log(`Caught exception: ${err}\n` +23              `Exception origin: ${origin}`);24});25const { chromium } = require('playwright');26(async () => {27  const browser = await chromium.launch();28  const context = await browser.newContext();29  const page = await context.newPage();30  await browser.close();31})();32process.on('uncaughtException', (err, origin) => {33  console.log(`Caught exception: ${err}\n` +34              `Exception origin: ${origin}`);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 browser.close();42})();

Using AI Code Generation

1const { webkit } = require('playwright');2(async () => {3    const browser = await webkit.launch();4    const context = await browser.newContext();5    const page = await context.newPage();6    await page.route('**/*', route => {7        route.fulfill({8        });9    });10    page.on('error', error => {11        console.log(error);12    });13    await browser.close();14})();

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  await page.context().onErrorCaptured((error) => {6    console.log(error);7  });8  await page.click('non-existing-selector');9  await browser.close();10})();11const { chromium } = require('playwright');12(async () => {13  const browser = await chromium.launch();14  const page = await browser.newPage();15  await page.context().onErrorCaptured((error) => {16    console.log(error);17  });18  await page.click('non-existing-selector');19  await browser.close();20})();21const { chromium } = require('playwright');22(async () => {23  const browser = await chromium.launch();24  const page = await browser.newPage();25  await page.context().onErrorCaptured((error) => {26    console.log(error);27  });28  await page.click('non-existing-selector');29  await browser.close();30})();31const { chromium } = require('playwright');32(async () => {33  const browser = await chromium.launch();34  const page = await browser.newPage();35  await page.context().onErrorCaptured((error) => {36    console.log(error);37  });38  await page.click('non-existing-selector');39  await browser.close();40})();41const { chromium } = require('playwright');42(async () => {43  const browser = await chromium.launch();44  const page = await browser.newPage();45  await page.context().onErrorCaptured((error) => {46    console.log(error);47  });48  await page.click('non-existing-selector');49  await browser.close();50})();51const {

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.waitForSelector('text=Get started');7  await page.on('error', async err => {8    console.log('error occured');9    const errorDetails = await page.evaluate(() => {10      return window.playwrightError;11    });12    console.log(errorDetails);13  });14  await page.click('text=Get started');15  await browser.close();16})();

Using AI Code Generation

1const { Playwright } = require('playwright');2const playwright = new Playwright();3const { BrowserType } = playwright;4const { Browser } = require('playwright');5const { Page } = require('playwright');6const { ElementHandle } = require('playwright');7const { Frame } = require('playwright');8const { Worker } = require('playwright');9const { JSHandle } = require('playwright');10const { Dialog } = require('playwright');11const { ConsoleMessage } = require('playwright');12const { Route } = require('playwright');13const { WebSocket } = require('playwright');14const { TimeoutError } = require('playwright');15const { Error } = require('playwright');16const { Request } = require('playwright');17const { Response } = require('playwright');18const { SecurityDetails } = require('playwright');19const { BrowserContext } = require('playwright');20const { Selectors } = require('playwright');21const { Accessibility } = require('playwright');22const { Tracing } = require('playwright');23const { Video } = require('playwright');24const { BrowserServer } = require('playwright');25const { WebKit } = require('playwright');26const { Chromium } = require('playwright');27const { Firefox } = require('playwright');28const { BrowserContextOptions } = require('playwright');29const { LaunchOptions } = require('playwright');30const { BrowserTypeLaunchOptions } = require('playwright');31const { BrowserTypeConnectOptions } = require('playwright');32const { BrowserTypeLaunchPersistentContextOptions } = require('playwright');33const { LaunchPersistentContextOptions } = require('playwright');34const { BrowserContextOptionsBase } = require('playwright');35const { ProxySettings } = require('playwright');36const { BrowserContextOptionsGeolocation } = require('playwright');37const { Geolocation } = require('playwright');38const { BrowserContextOptionsHttpCredentials } = require('playwright');39const { HttpCredentials } = require('playwright');40const { BrowserContextOptionsViewport } = require('playwright');41const { ViewportSize } = require('playwright');42const { BrowserContextOptionsDevice } = require('playwright');43const { DeviceDescriptor } = require('playwright');44const { BrowserContextOptionsRecordVideo } = require('playwright');45const { RecordVideoSize } = require

Using AI Code Generation

1const { Playwright } = require('playwright');2const playwright = new Playwright();3const { chromium, webkit, firefox } = playwright;4async function main() {5  const browser = await chromium.launch({6  });7  const context = await browser.newContext();8  const page = await context.newPage();9  page.on('error', (error) => {10    console.log('Error captured in page: ', error);11  });12  await page.click('text=Click me');13  await page.waitForTimeout(2000);14  await browser.close();15}16main();17const { chromium } = require('playwright');18(async () => {19  try {20    const browser = await chromium.launch({21    });22    const context = await browser.newContext();23    const page = await context.newPage();24    page.on('error', (error) => {25      console.log('Error captured in page: ', error);26    });27    await page.click('text=Click me');28    await page.waitForTimeout(2000);29    await browser.close();30  } catch (error) {31    console.log('Error captured in try-catch block: ', error);32  }33})();34const { chromium } = require('playwright');35(async () => {36  const browser = await chromium.launch({37  });38  const context = await browser.newContext();39  const page = await context.newPage();40  page.on('error', (error) => {41    console.log('Error captured in page: ', error);42  });43    .then(()

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  page.on('pageerror', err => {7    console.log(err);8  });9  page.on('error', err => {10    console.log(err);11  });12  page.on('requestfailed', err => {13    console.log(err);14  });15  page.on('requestfinished', err => {16    console.log(err);17  });18  page.on('response', err => {19    console.log(err);20  });21  page.on('request', err => {22    console.log(err);23  });24  page.on('console', err => {25    console.log(err);26  });27  page.on('dialog', err => {28    console.log(err);29  });30  page.on('frameattached', err => {31    console.log(err);32  });33  page.on('framedetached', err => {34    console.log(err);35  });36  page.on('framenavigated', err => {37    console.log(err);38  });39  page.on('loadstate', err => {40    console.log(err);41  });42  page.on('navigated', err => {43    console.log(err);44  });45  page.on('workercreated', err => {46    console.log(err);47  });48  page.on('workerdestroyed', err => {49    console.log(err);50  });51  page.on('close', err => {52    console.log(err);53  });54  page.on('crash', err => {55    console.log(err);56  });57  page.on('popup', err => {58    console.log(err);59  });60  page.on('requestfailed', err => {61    console.log(err);62  });63  page.on('requestfinished', err => {64    console.log(err);65  });66  page.on('response', err => {67    console.log(err);68  });69  page.on('request', err => {70    console.log(err);71  });72  page.on('websocket', err => {73    console.log(err);74  });75  page.on('webworker', err => {76    console.log(err);77  });78  page.on('requestfailed', err => {79    console.log(err);80  });81  page.on('requestfinished', err => {

StackOverFlow community discussions

Questions

Discussion

firefox browser does not start in playwright

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

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

Running Playwright in Azure Function

firefox browser does not start in playwright

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

Assuming you are not running test with the --runinband flag, the simple answer is yes but it depends ????

There is a pretty comprehensive GitHub issue jest#6957 that explains certain cases of when tests are run concurrently or in parallel. But it seems to depend on a lot of edge cases where jest tries its best to determine the fastest way to run the tests given the circumstances.

To my knowledge there is no way to force jest to run in parallel.

Aside

Have you considered using playwright instead of puppeteer with jest? Playwright has their own internally built testing library called @playwright/test that is used in place of jest with a similar API. This library allows for explicitly defining test groups in a single file to run in parallel (i.e. test.describe.parallel) or serially (i.e. test.describe.serial). Or even to run all tests in parallel via a config option.

// parallel
test.describe.parallel('group', () => {
  test('runs in parallel 1', async ({ page }) => {});
  test('runs in parallel 2', async ({ page }) => {});
});

// serial
test.describe.serial('group', () => {
  test('runs first', async ({ page }) => {});
  test('runs second', async ({ page }) => {});
});

https://stackoverflow.com/questions/73497773/how-to-run-a-list-of-test-suites-in-a-single-file-concurrently-in-jest

Well this is one way, but not sure if it will work for all possible locators!.

// Get a selector from a playwright locator
import { Locator } from "@playwright/test";
export function extractSelector(locator: Locator) {
    const selector = locator.toString();
    const parts = selector.split("@");
    if (parts.length !== 2) { throw Error("extractSelector: susupect that this is not a locator"); }
    if (parts[0] !== "Locator") { throw Error("extractSelector: did not find locator"); }
    return parts[1];
}

https://stackoverflow.com/questions/72044959/is-it-possible-to-get-the-selector-from-a-locator-object-in-playwright

I found the error. It was because of some missing libraries need. I discovered this when I downgraded playwright to version 1.9 and ran the the code then this was the error msg:

(node:12876) UnhandledPromiseRejectionWarning: browserType.launch: Host system is missing dependencies!

Some of the Universal C Runtime files cannot be found on the system. You can fix
that by installing Microsoft Visual C++ Redistributable for Visual Studio from:
https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads

Full list of missing libraries:
    vcruntime140.dll
    msvcp140.dll
Error
    at Object.captureStackTrace (D:\Projects\snkrs-play\node_modules\playwright\lib\utils\stackTrace.js:48:19)
    at Connection.sendMessageToServer (D:\Projects\snkrs-play\node_modules\playwright\lib\client\connection.js:69:48)
    at Proxy.<anonymous> (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:64:61)
    at D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:64:67
    at BrowserType._wrapApiCall (D:\Projects\snkrs-play\node_modules\playwright\lib\client\channelOwner.js:77:34)
    at BrowserType.launch (D:\Projects\snkrs-play\node_modules\playwright\lib\client\browserType.js:55:21)
    at D:\Projects\snkrs-play\index.js:4:35
    at Object.<anonymous> (D:\Projects\snkrs-play\index.js:7:3)
    at Module._compile (internal/modules/cjs/loader.js:1063:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
(Use `node --trace-warnings ...` to show where the warning was created)
(node:12876) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:12876) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

A list of missing libraries was provided. After successful installments, firefox ran fine. I upgraded again to version 1.10 and firefox still works.

https://stackoverflow.com/questions/66984974/firefox-browser-does-not-start-in-playwright

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:

How To Identify Locators In Appium [With Examples]

Nowadays, automation is becoming integral to the overall quality of the products being developed. Especially for mobile applications, it’s even more important to implement automation robustly.

How To Use driver.FindElement And driver.FindElements In Selenium C#

One of the essential parts when performing automated UI testing, whether using Selenium or another framework, is identifying the correct web elements the tests will interact with. However, if the web elements are not located correctly, you might get NoSuchElementException in Selenium. This would cause a false negative result because we won’t get to the actual functionality check. Instead, our test will fail simply because it failed to interact with the correct element.

Now Log Bugs Using LambdaTest and DevRev

In today’s world, an organization’s most valuable resource is its customers. However, acquiring new customers in an increasingly competitive marketplace can be challenging while maintaining a strong bond with existing clients. Implementing a customer relationship management (CRM) system will allow your organization to keep track of important customer information. This will enable you to market your services and products to these customers better.

13 Best Test Automation Frameworks: The 2021 List

Automation frameworks enable automation testers by simplifying the test development and execution activities. A typical automation framework provides an environment for executing test plans and generating repeatable output. They are specialized tools that assist you in your everyday test automation tasks. Whether it is a test runner, an action recording tool, or a web testing tool, it is there to remove all the hard work from building test scripts and leave you with more time to do quality checks. Test Automation is a proven, cost-effective approach to improving software development. Therefore, choosing the best test automation framework can prove crucial to your test results and QA timeframes.

Acquiring Employee Support for Change Management Implementation

Enterprise resource planning (ERP) is a form of business process management software—typically a suite of integrated applications—that assists a company in managing its operations, interpreting data, and automating various back-office processes. The introduction of a new ERP system is analogous to the introduction of a new product into the market. If the product is not handled appropriately, it will fail, resulting in significant losses for the business. Most significantly, the employees’ time, effort, and morale would suffer as a result of the procedure.

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.