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How to use pushHostContainer method in Playwright Internal

Best JavaScript code snippet using playwright-internal

ReactFiberHostContext.js

...17  getHostContext(): CX,18  getRootHostContainer(): C,19  popHostContainer(fiber: Fiber): void,20  popHostContext(fiber: Fiber): void,21  pushHostContainer(fiber: Fiber, container: C): void,22  pushHostContext(fiber: Fiber): void,23  resetHostContainer(): void,24};25export default function<T, P, I, TI, HI, PI, C, CC, CX, PL>(26  config: HostConfig<T, P, I, TI, HI, PI, C, CC, CX, PL>,27): HostContext<C, CX> {28  const {getChildHostContext, getRootHostContext} = config;29  let contextStackCursor: StackCursor<CX | NoContextT> = createCursor(30    NO_CONTEXT,31  );32  let contextFiberStackCursor: StackCursor<Fiber | NoContextT> = createCursor(33    NO_CONTEXT,34  );35  let rootInstanceStackCursor: StackCursor<C | NoContextT> = createCursor(36    NO_CONTEXT,37  );38  function requiredContext<Value>(c: Value | NoContextT): Value {39    invariant(40      c !== NO_CONTEXT,41      'Expected host context to exist. This error is likely caused by a bug ' +42        'in React. Please file an issue.',43    );44    return (c: any);45  }46  function getRootHostContainer(): C {47    const rootInstance = requiredContext(rootInstanceStackCursor.current);48    return rootInstance;49  }50  function pushHostContainer(fiber: Fiber, nextRootInstance: C) {51    // Push current root instance onto the stack;52    // This allows us to reset root when portals are popped.53    push(rootInstanceStackCursor, nextRootInstance, fiber);54    const nextRootContext = getRootHostContext(nextRootInstance);55    // Track the context and the Fiber that provided it.56    // This enables us to pop only Fibers that provide unique contexts.57    push(contextFiberStackCursor, fiber, fiber);58    push(contextStackCursor, nextRootContext, fiber);59  }60  function popHostContainer(fiber: Fiber) {61    pop(contextStackCursor, fiber);62    pop(contextFiberStackCursor, fiber);63    pop(rootInstanceStackCursor, fiber);64  }...

8193c972f72cdded6bdf7eabbb9a61639b21f8ReactFiberHostContext.js

Source: 8193c972f72cdded6bdf7eabbb9a61639b21f8ReactFiberHostContext.js

...15    var rootInstance = rootInstanceStackCursor.current;16    invariant(rootInstance !== null, 'Expected root container to exist. This error is likely caused by a ' + 'bug in React. Please file an issue.');17    return rootInstance;18  }19  function pushHostContainer(fiber, nextRootInstance) {20    push(rootInstanceStackCursor, nextRootInstance, fiber);21    var nextRootContext = getRootHostContext(nextRootInstance);22    push(contextFiberStackCursor, fiber, fiber);23    push(contextStackCursor, nextRootContext, fiber);24  }25  function popHostContainer(fiber) {26    pop(contextStackCursor, fiber);27    pop(contextFiberStackCursor, fiber);28    pop(rootInstanceStackCursor, fiber);29  }30  function getHostContext() {31    var context = contextStackCursor.current;32    invariant(context != null, 'Expected host context to exist. This error is likely caused by a bug ' + 'in React. Please file an issue.');33    return context;...

155aaf97649314d984baaeb9064d0e6efcdadcReactFiberHostContext.js

Source: 155aaf97649314d984baaeb9064d0e6efcdadcReactFiberHostContext.js

...15    var rootInstance = rootInstanceStackCursor.current;16    invariant(rootInstance !== null, 'Expected root container to exist. This error is likely caused by a ' + 'bug in React. Please file an issue.');17    return rootInstance;18  }19  function pushHostContainer(fiber, nextRootInstance) {20    push(rootInstanceStackCursor, nextRootInstance, fiber);21    var nextRootContext = getRootHostContext(nextRootInstance);22    push(contextFiberStackCursor, fiber, fiber);23    push(contextStackCursor, nextRootContext, fiber);24  }25  function popHostContainer(fiber) {26    pop(contextStackCursor, fiber);27    pop(contextFiberStackCursor, fiber);28    pop(rootInstanceStackCursor, fiber);29  }30  function getHostContext() {31    var context = contextStackCursor.current;32    invariant(context != null, 'Expected host context to exist. This error is likely caused by a bug ' + 'in React. Please file an issue.');33    return context;...

e68c4187258c40eb815c6820eb32e1371a3792ReactFiberHostContext.js

Source: e68c4187258c40eb815c6820eb32e1371a3792ReactFiberHostContext.js

...15    var rootInstance = rootInstanceStackCursor.current;16    invariant(rootInstance !== null, 'Expected root container to exist. This error is likely caused by a ' + 'bug in React. Please file an issue.');17    return rootInstance;18  }19  function pushHostContainer(fiber, nextRootInstance) {20    push(rootInstanceStackCursor, nextRootInstance, fiber);21    var nextRootContext = getRootHostContext(nextRootInstance);22    push(contextFiberStackCursor, fiber, fiber);23    push(contextStackCursor, nextRootContext, fiber);24  }25  function popHostContainer(fiber) {26    pop(contextStackCursor, fiber);27    pop(contextFiberStackCursor, fiber);28    pop(rootInstanceStackCursor, fiber);29  }30  function getHostContext() {31    var context = contextStackCursor.current;32    invariant(context != null, 'Expected host context to exist. This error is likely caused by a bug ' + 'in React. Please file an issue.');33    return context;...

dcefc342e0dabab33f08a1fce5722c31fe7423ReactFiberHostContext.js

Source: dcefc342e0dabab33f08a1fce5722c31fe7423ReactFiberHostContext.js

...15    var rootInstance = rootInstanceStackCursor.current;16    invariant(rootInstance !== null, 'Expected root container to exist. This error is likely caused by a ' + 'bug in React. Please file an issue.');17    return rootInstance;18  }19  function pushHostContainer(fiber, nextRootInstance) {20    push(rootInstanceStackCursor, nextRootInstance, fiber);21    var nextRootContext = getRootHostContext(nextRootInstance);22    push(contextFiberStackCursor, fiber, fiber);23    push(contextStackCursor, nextRootContext, fiber);24  }25  function popHostContainer(fiber) {26    pop(contextStackCursor, fiber);27    pop(contextFiberStackCursor, fiber);28    pop(rootInstanceStackCursor, fiber);29  }30  function getHostContext() {31    var context = contextStackCursor.current;32    invariant(context != null, 'Expected host context to exist. This error is likely caused by a bug ' + 'in React. Please file an issue.');33    return context;...

59ca3cede4156fadfe57a59ec5689b14028cd5ReactFiberHostContext.js

Source: 59ca3cede4156fadfe57a59ec5689b14028cd5ReactFiberHostContext.js

...15    var rootInstance = rootInstanceStackCursor.current;16    invariant(rootInstance !== null, 'Expected root container to exist. This error is likely caused by a ' + 'bug in React. Please file an issue.');17    return rootInstance;18  }19  function pushHostContainer(fiber, nextRootInstance) {20    push(rootInstanceStackCursor, nextRootInstance, fiber);21    var nextRootContext = getRootHostContext(nextRootInstance);22    push(contextFiberStackCursor, fiber, fiber);23    push(contextStackCursor, nextRootContext, fiber);24  }25  function popHostContainer(fiber) {26    pop(contextStackCursor, fiber);27    pop(contextFiberStackCursor, fiber);28    pop(rootInstanceStackCursor, fiber);29  }30  function getHostContext() {31    var context = contextStackCursor.current;32    invariant(context != null, 'Expected host context to exist. This error is likely caused by a bug ' + 'in React. Please file an issue.');33    return context;...

cdb9c263417dac9d83fc04ed7b609fac804c19ReactFiberHostContext.js

Source: cdb9c263417dac9d83fc04ed7b609fac804c19ReactFiberHostContext.js

...15    var rootInstance = rootInstanceStackCursor.current;16    invariant(rootInstance !== null, 'Expected root container to exist. This error is likely caused by a ' + 'bug in React. Please file an issue.');17    return rootInstance;18  }19  function pushHostContainer(fiber, nextRootInstance) {20    push(rootInstanceStackCursor, nextRootInstance, fiber);21    var nextRootContext = getRootHostContext(nextRootInstance);22    push(contextFiberStackCursor, fiber, fiber);23    push(contextStackCursor, nextRootContext, fiber);24  }25  function popHostContainer(fiber) {26    pop(contextStackCursor, fiber);27    pop(contextFiberStackCursor, fiber);28    pop(rootInstanceStackCursor, fiber);29  }30  function getHostContext() {31    var context = contextStackCursor.current;32    invariant(context != null, 'Expected host context to exist. This error is likely caused by a bug ' + 'in React. Please file an issue.');33    return context;...

948bac31dd20785c5b6eb4b729723c126ef8e4ReactFiberHostContext.js

Source: 948bac31dd20785c5b6eb4b729723c126ef8e4ReactFiberHostContext.js

...15    var rootInstance = rootInstanceStackCursor.current;16    invariant(rootInstance !== null, 'Expected root container to exist. This error is likely caused by a ' + 'bug in React. Please file an issue.');17    return rootInstance;18  }19  function pushHostContainer(fiber, nextRootInstance) {20    push(rootInstanceStackCursor, nextRootInstance, fiber);21    var nextRootContext = getRootHostContext(nextRootInstance);22    push(contextFiberStackCursor, fiber, fiber);23    push(contextStackCursor, nextRootContext, fiber);24  }25  function popHostContainer(fiber) {26    pop(contextStackCursor, fiber);27    pop(contextFiberStackCursor, fiber);28    pop(rootInstanceStackCursor, fiber);29  }30  function getHostContext() {31    var context = contextStackCursor.current;32    invariant(context != null, 'Expected host context to exist. This error is likely caused by a bug ' + 'in React. Please file an issue.');33    return context;...

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.evaluate(() => {7    });8    await page.evaluate(() => {9        window['playwright'].popHostContainer();10        window['playwright'].popHostContainer();11    });12    await browser.close();13})();14## Usage with `browserType.connect()`15The `browserType.connect()` method returns a Browser instance that will connect to an existing browser instance:16const { chromium } = require('playwright');17(async () => {18  const browserServer = await chromium.launchServer();19  const wsEndpoint = browserServer.wsEndpoint();20  const browser = await chromium.connect({ wsEndpoint });21  await browser.close();22  await browserServer.close();23})();24## Usage with `browserType.launchServer()`25The `browserType.launchServer()` method launches a browser and returns a BrowserServer instance that can be used to connect to the launched browser:26const { chromium } = require('playwright');27(async () => {28  const browserServer = await chromium.launchServer();29  const wsEndpoint = browserServer.wsEndpoint();30  const browser = await chromium.connect({ wsEndpoint });31  await browser.close();32  await browserServer.close();33})();34## Usage with `browserType.launchPersistentContext()`35The `browserType.launchPersistentContext()` method launches a browser with a persistent user data directory. 36const { chromium } = require('playwright');37(async () => {38  const browser = await chromium.launchPersistentContext('user-data-dir');39  await browser.close();40})();41## Usage with `browser.newContext()`

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 browser.close();7})();8### **`page.popHostContainer()`**9const { chromium } = require('playwright');10(async () => {11    const browser = await chromium.launch();12    const context = await browser.newContext();13    const page = await context.newPage();14    await page.popHostContainer();15    await browser.close();16})();17### **`page.setHostContainer()`**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.popHostContainer();24    await page.setHostContainer();25    await browser.close();26})();27### **`page.clearHostContainer()`**28const { chromium } = require('playwright');29(async () => {30    const browser = await chromium.launch();

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.waitForTimeout(1000);7  await page.pushHostContainer('localhost', 8080);8  await page.waitForTimeout(1000);9  await page.popHostContainer();10  await page.waitForTimeout(1000);11  await browser.close();12})();13### `popHostContainer()`14const { chromium } = require('playwright');15(async () => {16  const browser = await chromium.launch({headless: false});17  const context = await browser.newContext();18  const page = await context.newPage();19  await page.waitForTimeout(1000);20  await page.pushHostContainer('localhost', 8080);21  await page.waitForTimeout(1000);22  await page.popHostContainer();23  await page.waitForTimeout(1000);24  await browser.close();25})();26### `setGeolocation(options)`27const { chromium } = require('playwright');28(async () => {29  const browser = await chromium.launch({headless: false});30  const context = await browser.newContext();31  const page = await context.newPage();32  await page.setGeolocation({latitude: 59.95, longitude: 30.31667});33  await page.waitForTimeout(1000);34  await browser.close();

Using AI Code Generation

1const { chromium } = require('playwright');2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  const context = await page.context();6  const container = await context.newPage();7  await page.pushHostContainer(container);8  await page.popHostContainer();9  await container.close();10  await browser.close();11})();12### 4.4.4. `page.route(url, handler)`13const { chromium } = require('playwright');14(async () => {15  const browser = await chromium.launch();16  const page = await browser.newPage();17  await page.route('**/empty.html', route => route.fulfill({18  }));19  await browser.close();20})();21### 4.4.5. `page.route(url, handler)`

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.pushHostContainer('containerId', 'containerName');6  await browser.close();7})();8#### browser.newPage([options])

Using AI Code Generation

1const { chromium } = require('playwright');2const { pushHostContainer } = require('playwright/lib/server/browserContext.js');3(async () => {4    const browser = await chromium.launch();5    const context = await browser.newContext();6    const page = await context.newPage();7    const container = {id: 'container', name: 'container', image: 'image'};8    await pushHostContainer(context, container);9    await browser.close();10})();11const { chromium } = require('playwright');12const { pushHostContainer } = require('playwright/lib/server/browserContext.js');13(async () => {14    const browser = await chromium.launch();15    const context = await browser.newContext();16    const page = await context.newPage();17    const container = {id: 'container', name: 'container', image: 'image'};18    await pushHostContainer(context, container);19    await browser.close();20})();21const { chromium } = require('playwright');22const { pushHostContainer } = require('playwright/lib/server/browserContext.js');23(async () => {24    const browser = await chromium.launch();25    const context = await browser.newContext();26    const page = await context.newPage();27    const container = {id: 'container', name: 'container', image: 'image'};28    await pushHostContainer(context, container);29    await browser.close();30})();31const { chromium } = require('playwright');32const { pushHostContainer } = require('playwright/lib/server/browserContext.js');33(async () => {34    const browser = await chromium.launch();35    const context = await browser.newContext();36    const page = await context.newPage();37    const container = {id: 'container', name

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.evaluate(() => {6    window.playwright._pushHostContainer(document.querySelector('header'));7  });8  await page.screenshot({ path: `header.png` });9  await browser.close();10})();

Using AI Code Generation

1const { chromium, webkit, firefox } = require('playwright');2const { pushHostContainer } = require('playwright/lib/server/browserContext');3const { chromium: chromiumBrowser } = require('playwright-chromium');4const { webkit: webkitBrowser } = require('playwright-webkit');5const { firefox: firefoxBrowser } = require('playwright-firefox');6const browserType = process.env.BROWSER || 'chromium';7(async () => {8  const browser = await {9  }[browserType].launch();10  const context = await browser.newContext();11  const page = await context.newPage();12  const newPage = await context.newPage();13  await pushHostContainer(newPage, page);14  await newPage.screenshot({ path: `example-${browserType}.png` });15  await browser.close();16})();

Using AI Code Generation

1const { chromium } = require('playwright');2const { createHost } = require('playwright-core/lib/server/browserServer');3const { createPlaywright } = require('playwright-core/lib/server/playwright');4const { createPlaywrightServer } = require('playwright-core/lib/server/playwrightServer');5const { createServer } = require('playwright-core/lib/server/webServer');6const { createWebSocketServer } = require('playwright-core/lib/server/webSocketServer');7const { createTestServer } = require('playwright-core/lib/utils/testserver');8const { createTestState } = require('playwright-core/lib/utils/teststate');9(async () => {10  const testState = createTestState();11  const server = await createTestServer(testState);12  const playwrightServer = await createPlaywrightServer();13  const webSocketServer = await createWebSocketServer();14  const webServer = await createServer({15  });16  const playwright = createPlaywright(webServer);17  const browserType = playwright.chromium;18  const host = await createHost({ webSocketServer, browserType });19  await host.pushHostContainer();20  const browser = await browserType.launch();21  const context = await browser.newContext();22  const page = await context.newPage();23  await page.goto(server.PREFIX + '/grid.html');24  await page.waitForSelector('div');25  await page.click('div');26  await page.waitForSelector('.red');27  await browser.close();28  await host.close();29  await webServer.close();30  await webSocketServer.close();31  await playwrightServer.close();32  await server.stop();33})();34![Expected Output](

StackOverFlow community discussions

Questions

Discussion

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

Running Playwright in Azure Function

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

firefox browser does not start in playwright

Is it possible to get the selector from a locator object 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

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

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

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

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

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

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

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

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

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

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

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While there is a huge demand and need to run Selenium Test Automation, the experts always suggest not to automate every possible test. Exhaustive Testing is not possible, and Automating everything is not sustainable.

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.