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How to use _assertValueLink method in Playwright Internal

Best JavaScript code snippet using playwright-internal

LinkedValueUtils.src.js

...15  };16  function _assertSingleLink(input) {17    ("production" !== process.env.NODE_ENV ? invariant(input.props.checkedLink == null || input.props.valueLink == null, 'Cannot provide a checkedLink and a valueLink. If you want to use ' + 'checkedLink, you probably don\'t want to use valueLink and vice versa.') : invariant(input.props.checkedLink == null || input.props.valueLink == null));18  }19  function _assertValueLink(input) {20    _assertSingleLink(input);21    ("production" !== process.env.NODE_ENV ? invariant(input.props.value == null && input.props.onChange == null, 'Cannot provide a valueLink and a value or onChange event. If you want ' + 'to use value or onChange, you probably don\'t want to use valueLink.') : invariant(input.props.value == null && input.props.onChange == null));22  }23  function _assertCheckedLink(input) {24    _assertSingleLink(input);25    ("production" !== process.env.NODE_ENV ? invariant(input.props.checked == null && input.props.onChange == null, 'Cannot provide a checkedLink and a checked property or onChange event. ' + 'If you want to use checked or onChange, you probably don\'t want to ' + 'use checkedLink') : invariant(input.props.checked == null && input.props.onChange == null));26  }27  function _handleLinkedValueChange(e) {28    this.props.valueLink.requestChange(e.target.value);29  }30  function _handleLinkedCheckChange(e) {31    this.props.checkedLink.requestChange(e.target.checked);32  }33  var LinkedValueUtils = {34    Mixin: {propTypes: {35        value: function(props, propName, componentName) {36          if (!props[propName] || hasReadOnlyValue[props.type] || props.onChange || props.readOnly || props.disabled) {37            return;38          }39          return new Error('You provided a `value` prop to a form field without an ' + '`onChange` handler. This will render a read-only field. If ' + 'the field should be mutable use `defaultValue`. Otherwise, ' + 'set either `onChange` or `readOnly`.');40        },41        checked: function(props, propName, componentName) {42          if (!props[propName] || props.onChange || props.readOnly || props.disabled) {43            return;44          }45          return new Error('You provided a `checked` prop to a form field without an ' + '`onChange` handler. This will render a read-only field. If ' + 'the field should be mutable use `defaultChecked`. Otherwise, ' + 'set either `onChange` or `readOnly`.');46        },47        onChange: ReactPropTypes.func48      }},49    getValue: function(input) {50      if (input.props.valueLink) {51        _assertValueLink(input);52        return input.props.valueLink.value;53      }54      return input.props.value;55    },56    getChecked: function(input) {57      if (input.props.checkedLink) {58        _assertCheckedLink(input);59        return input.props.checkedLink.value;60      }61      return input.props.checked;62    },63    getOnChange: function(input) {64      if (input.props.valueLink) {65        _assertValueLink(input);66        return _handleLinkedValueChange;67      } else if (input.props.checkedLink) {68        _assertCheckedLink(input);69        return _handleLinkedCheckChange;70      }71      return input.props.onChange;72    }73  };74  module.exports = LinkedValueUtils;...

LinkedValueUtils.js

Source: LinkedValueUtils.js

...14  };15  function _assertSingleLink(input) {16    ("production" !== process.env.NODE_ENV ? invariant(input.props.checkedLink == null || input.props.valueLink == null, 'Cannot provide a checkedLink and a valueLink. If you want to use ' + 'checkedLink, you probably don\'t want to use valueLink and vice versa.') : invariant(input.props.checkedLink == null || input.props.valueLink == null));17  }18  function _assertValueLink(input) {19    _assertSingleLink(input);20    ("production" !== process.env.NODE_ENV ? invariant(input.props.value == null && input.props.onChange == null, 'Cannot provide a valueLink and a value or onChange event. If you want ' + 'to use value or onChange, you probably don\'t want to use valueLink.') : invariant(input.props.value == null && input.props.onChange == null));21  }22  function _assertCheckedLink(input) {23    _assertSingleLink(input);24    ("production" !== process.env.NODE_ENV ? invariant(input.props.checked == null && input.props.onChange == null, 'Cannot provide a checkedLink and a checked property or onChange event. ' + 'If you want to use checked or onChange, you probably don\'t want to ' + 'use checkedLink') : invariant(input.props.checked == null && input.props.onChange == null));25  }26  function _handleLinkedValueChange(e) {27    this.props.valueLink.requestChange(e.target.value);28  }29  function _handleLinkedCheckChange(e) {30    this.props.checkedLink.requestChange(e.target.checked);31  }32  var LinkedValueUtils = {33    Mixin: {propTypes: {34        value: function(props, propName, componentName) {35          if (!props[propName] || hasReadOnlyValue[props.type] || props.onChange || props.readOnly || props.disabled) {36            return null;37          }38          return new Error('You provided a `value` prop to a form field without an ' + '`onChange` handler. This will render a read-only field. If ' + 'the field should be mutable use `defaultValue`. Otherwise, ' + 'set either `onChange` or `readOnly`.');39        },40        checked: function(props, propName, componentName) {41          if (!props[propName] || props.onChange || props.readOnly || props.disabled) {42            return null;43          }44          return new Error('You provided a `checked` prop to a form field without an ' + '`onChange` handler. This will render a read-only field. If ' + 'the field should be mutable use `defaultChecked`. Otherwise, ' + 'set either `onChange` or `readOnly`.');45        },46        onChange: ReactPropTypes.func47      }},48    getValue: function(input) {49      if (input.props.valueLink) {50        _assertValueLink(input);51        return input.props.valueLink.value;52      }53      return input.props.value;54    },55    getChecked: function(input) {56      if (input.props.checkedLink) {57        _assertCheckedLink(input);58        return input.props.checkedLink.value;59      }60      return input.props.checked;61    },62    getOnChange: function(input) {63      if (input.props.valueLink) {64        _assertValueLink(input);65        return _handleLinkedValueChange;66      } else if (input.props.checkedLink) {67        _assertCheckedLink(input);68        return _handleLinkedCheckChange;69      }70      return input.props.onChange;71    }72  };73  module.exports = LinkedValueUtils;...

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.click('text=Get started');6  await page.click('text=API');7  await page.click('text=BrowserContext');8  await page.click('text=BrowserContext.newPage');9  await page.click('text=Parameters');10  await page.click('text=apiName');11  await page._assertValueLink('text=apiName', 'apiName');12  await browser.close();13})();14page.textContent(link)15page.getAttribute(link, attributeName)16page.getAttribute(link, ‘href’)17page.getAttribute(link, ‘value’)18page.getAttribute(link, ‘title’)19page.getAttribute(link, ‘name’)20page.getAttribute(link, ‘id’)21page.getAttribute(link, ‘class’)22page.getAttribute(link, ‘data-qa’)23As an example, the following script uses the page.getAttribute(link, ‘href’) method to assert the value of the link “apiName”:24const { chromium } = require('playwright');25(async () => {26  const browser = await chromium.launch();

Using AI Code Generation

1const { chromium } = require("playwright");2(async () => {3  const browser = await chromium.launch();4  const page = await browser.newPage();5  const input = await page.$("input");6  await input._assertValueLink();7  await browser.close();8})();

Using AI Code Generation

1const { _assertValueLink } = require('playwright/lib/server/dom.js');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch();5  const page = await browser.newPage();6  const input = await page.$('input[name="q"]');7  _assertValueLink(input);8  await browser.close();9})();10    at _assertValueLink (C:\Users\user\Documents\playwright\test.js:7:5)11    at processTicksAndRejections (internal/process/task_queues.js:93:5)

Using AI Code Generation

1const { assertValueLink } = require('playwright/lib/internal/stackTrace');2const { assert } = require('playwright/lib/internal/assert');3const { InternalAPI } = require('playwright/lib/internal/api');4const { ElementHandle } = require('playwright/lib/dom');5const { JSHandle } = require('playwright/lib/jsHandle');6const { Frame } = require('playwright/lib/frame');7const frame = new Frame();8const elementHandle = new ElementHandle();9const jsHandle = new JSHandle();10const valueLink = {11  toString: () => 'valueLink'12};13const result = InternalAPI._assertValueLink(valueLink, 'valueLink');14console.log(result);15const result1 = InternalAPI._assertValueLink(valueLink, 'valueLink1');16console.log(result1);17const result2 = InternalAPI._assertValueLink(valueLink, 'valueLink2');18console.log(result2);19const result3 = InternalAPI._assertValueLink(valueLink, 'valueLink3');20console.log(result3);21const result4 = InternalAPI._assertValueLink(valueLink, 'valueLink4');22console.log(result4);23const result5 = InternalAPI._assertValueLink(valueLink, 'valueLink5');24console.log(result5);25const result6 = InternalAPI._assertValueLink(valueLink, 'valueLink6');26console.log(result6);27const result7 = InternalAPI._assertValueLink(valueLink, 'valueLink7');28console.log(result7);29const result8 = InternalAPI._assertValueLink(valueLink, 'valueLink8');30console.log(result8);31const result9 = InternalAPI._assertValueLink(valueLink, 'valueLink9');32console.log(result9);33const result10 = InternalAPI._assertValueLink(valueLink, 'valueLink10');34console.log(result10);35const result11 = InternalAPI._assertValueLink(valueLink, 'valueLink11');36console.log(result11);37const result12 = InternalAPI._assertValueLink(valueLink, 'valueLink12');38console.log(result12);39const result13 = InternalAPI._assertValueLink(valueLink, 'valueLink13');40console.log(result13);41const result14 = InternalAPI._assertValueLink(valueLink, 'valueLink14');42console.log(result14);

Using AI Code Generation

1const { assert } = require('console');2const { Playwright } = require('playwright');3const { test } = require('playwright');4const { _assertValueLink } = require('playwright/lib/internal');5const { assert } = require('console');6const { Playwright } = require('playwright');7const { test } = require('playwright');8const { _assertValueLink } = require('playwright/lib/internal');9assert.equal(_assertValueLink, 'function');10assert.equal(_assertValueLink.name, '_assertValueLink');11assert.equal(_assertValueLink.length, 1);12assert.equal(_assertValueLink.toString(), 'function _assertValueLink() { [native code] }');13const { assert } = require('console');14const { Playwright } = require('playwright');15const { test } = require('playwright');16const { _assertValueLink } = require('playwright/lib/internal');17assert.equal(_assertValueLink, 'function');18assert.equal(_assertValueLink.name, '_assertValueLink');19assert.equal(_assertValueLink.length, 1);20assert.equal(_assertValueLink.toString(), 'function _assertValueLink() { [native code] }');21const { assert } = require('console');22const { Playwright } = require('playwright');23const { test } = require('playwright');24const { _assertValueLink } = require('playwright/lib/internal');25assert.equal(_assertValueLink, 'function');26assert.equal(_assertValueLink.name, '_assertValueLink');27assert.equal(_assertValueLink.length, 1);28assert.equal(_assertValueLink.toString(), 'function _assertValueLink() { [native code] }');29const { assert } = require('console');30const { Playwright } = require('playwright');31const { test } = require('playwright');32const { _assertValueLink } = require('playwright/lib/internal');33assert.equal(_assertValueLink, 'function');34assert.equal(_assertValueLink.name, '_assertValueLink');35assert.equal(_assertValueLink.length, 1);36assert.equal(_assertValueLink.toString(), 'function _assertValueLink() { [native code] }');37const { assert } = require('console');38const { Playwright } = require('playwright');39const { test } = require('playwright');40const { _

Using AI Code Generation

1const { _assertValueLink } = require('playwright/lib/utils');2it('should assert value link', async () => {3  await page.click('text=Get started');4  await page.click('text=Docs');5  await page.click('text=API');6  await page.click('text=P

Using AI Code Generation

1const { _assertValueLink } = require('playwright/lib/internal/selectorEngine');2const { chromium } = require('playwright');3(async () => {4  const browser = await chromium.launch({ headless: false });5  const context = await browser.newContext();6  const page = await context.newPage();7  const input = await page.$('input[name="q"]');8  const valueLink = await input._valueLink();9  const value = await valueLink.evaluate(node => node.value);10  await _assertValueLink(valueLink, value, 'text to assert');11  await browser.close();12})();13const { _assertValueLink } = require('playwright/lib/internal/selectorEngine');14const { chromium } = require('playwright');15(async () => {16  const browser = await chromium.launch({ headless: false });17  const context = await browser.newContext();18  const page = await context.newPage();19  const input = await page.$('input[name="q"]');20  const valueLink = await input._valueLink();21  const value = await valueLink.evaluate(node => node.value);22  await _assertValueLink(valueLink, value, 'text to assert');23  await browser.close();24})();

StackOverFlow community discussions

Questions

Discussion

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

firefox browser does not start in playwright

Running Playwright in Azure Function

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

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

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

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

Playwright tutorial

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Inputs And Buttons In Playwright: Every website has Input boxes and buttons; learn about testing inputs and buttons with different scenarios and examples.
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