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How to use validateAttributes method in Playwright Internal

Best JavaScript code snippet using playwright-internal

index.js

...125            id="outlined-first-name"126            label="First name"127            className={classes.textField}128            value={firstName}129            onBlur={() => validateAttributes()}130            onChange={handleChange('firstName')}131            autoComplete="given-name"132            margin="normal"133            variant="outlined"134            // error={firstNameError ? true : false}135            required136          />137        </FormControl>138        <FormControl>139          <TextField140            id="outlined-last-name"141            label="Last name"142            className={classes.textField}143            value={lastName}144            onBlur={() => validateAttributes()}145            onChange={handleChange('lastName')}146            autoComplete="family-name"147            margin="normal"148            variant="outlined"149            // error={lastNameError ? true : false}150            required151          />152        </FormControl>153        <FormControl>154          <TextField155            id="outlined-email-input"156            label="Email"157            className={classes.textField}158            value={email}159            type="email"160            onBlur={() => validateAttributes()}161            onChange={handleChange('email')}162            autoComplete="email"163            margin="normal"164            variant="outlined"165            // error={emailError ? true : false}166            required167          />168        </FormControl>169        <FormControl>170          <TextField171            id="outlined-number"172            label="Mobile number"173            value={number}174            onBlur={() => validateAttributes()}175            onChange={handleChange('number')}176            autoComplete="tel"177            type="tel"178            className={classes.textField}179            margin="normal"180            variant="outlined"181            // error={numberError ? true : false}182            required183          />184        </FormControl>185      </div>186      <div className={classes.flex2}>187        <FormControl>188          <TextField189            id="outlined-street-address"190            label="Street address"191            className={classes.textField}192            value={streetAddress}193            onBlur={() => validateAttributes()}194            onChange={handleChange('streetAddress')}195            autoComplete="address-line1"196            margin="normal"197            variant="outlined"198            // error={firstNameError ? true : false}199            required200          />201        </FormControl>202        <FormControl>203          <TextField204            id="outlined-address-line-2"205            label="Apt, suite, etc (optional)"206            className={classes.textField}207            value={addressLine2}208            onBlur={() => validateAttributes()}209            onChange={handleChange('addressLine2')}210            autoComplete="address-line2"211            margin="normal"212            variant="outlined"213            // error={lastNameError ? true : false}214          />215        </FormControl>216        <FormControl>217          <TextField218            id="outlined-city-input"219            label="City"220            className={classes.textField}221            value={city}222            onBlur={() => validateAttributes()}223            onChange={handleChange('city')}224            autoComplete="address-level2"225            margin="normal"226            variant="outlined"227            // error={emailError ? true : false}228            required229          />230        </FormControl>231        <div className={classes.sideBySide}>232          <FormControl variant="outlined" className={classes.menuItemFormControl} required autoComplete="address-level1">233            <InputLabel htmlFor="outlined-state-simple">234              State235            </InputLabel>236            <Select237              native238              value={state}239              onChange={handleChange('state')}240              input={241                <OutlinedInput242                  id="outlined-state-simple"243                  name="state"244                  labelWidth={55}245                />246              }247            >248              <option value=""/>249              {250                states.map((state, index) => <option key={index} value={state}>{state}</option>)251              }252            </Select>253          </FormControl>254          <FormControl>255            <TextField256              id="outlined-zip-code"257              label="ZIP Code"258              className={classes.smTextField}259              value={zipCode}260              onBlur={() => validateAttributes()}261              onChange={handleChange('zipCode')}262              autoComplete="postal-code"263              margin="normal"264              variant="outlined"265              required266            />267          </FormControl>268        </div>269      </div>270    </div>271  )272}273ShippingAddressForm.propTypes = {274  classes: PropTypes.object.isRequired,...

testBaseElement.js

Source: testBaseElement.js

...37  it('validateAttributes throws exception if type is not set', function () {38    var element;39    element = new BaseElement({attribute: 'attribute1'});40    assert.throws(function () {41      element.validateAttributes();42    }, /Must define a type\./);43  });44  it('validateAttributes throws exception if object does not contain required keys', function () {45    var element;46    element = new BaseElement({x: 0, y: 0});47    element.type = 'element';48    element.elementKeys = ['x', 'y', 'width'];49    assert.throws(function () {50      element.validateAttributes();51    }, /\'width\' is required\./);52  });53  it('validateAttributes allows required attributes without optional attributes', function () {54    var element;55    element = new BaseElement({x: 0, y: 0});56    element.type = 'element';57    element.elementKeys = ['x', 'y'];58    element.defaultAttributes = {'height': 'default'};59    assert.doesNotThrow(function () {60      element.validateAttributes();61    });62  });63  it('validateAttributes allows optional attributes', function () {64    var element;65    element = new BaseElement({x: 0, y: 0, height: 1});66    element.type = 'element';67    element.elementKeys = ['x', 'y'];68    element.defaultAttributes = {'height': 'default'};69    assert.doesNotThrow(function () {70      element.validateAttributes();71    });72  });73  it('toRaphaelObject', function () {74    var element, raphaelObj;75    element = new BaseElement({x: 0, y: 0, width: 1});76    element.type = 'element';77    element.elementKeys = ['x', 'y', 'width'];78    raphaelObj = element.toRaphaelObject();79    assert.deepEqual(raphaelObj, {80      type: 'element',81      x: 0,82      y: 0,83      width: 184    });...

ProductPageDescriptionLeft.jsx

Source: ProductPageDescriptionLeft.jsx

...36  };37  handleAddToBasket = () => {38    const { addItemToBasket, setToast, product } = this.props;39    const selectedAttributes = this.getSelectedAttributes();40    const fieldErrors = this.validateAttributes();41    this.setState({ fieldErrors });42    // If error fields were empty - submit43    if (!isObjectEmpty(fieldErrors)) {44      addItemToBasket({45        ...product,46        attributes: selectedAttributes,47      });48      setToast({49        title: 'Product added to the busket',50        position: 'top',51        duration: 3000,52        status: 'success',53      });54    }...

resource.js

Source: resource.js

...43            finalAttributes = [];44            for (i = attributes.length - 1; i >= 0; i--) {45                obj = Utils.extend({}, attributes[i]);46                delete obj.id;47                self.validateAttributes(obj);48                finalAttributes.push(obj);49            }50        } else {51            finalAttributes = Utils.extend({}, attributes);52            delete finalAttributes.id;53            self.validateAttributes(finalAttributes);54        }55        return self.client.request({ url: self.getUrl(), method: 'POST', data: JSON.stringify(finalAttributes) });56    };57    Resource.prototype.save = function (attributes, method) {58        // Returns a promise that when resolved it contains a Javascript object representing the object returned by the API59        var self = this, finalAttributes, i, obj, id;60        method = method && ('' + method).toUpperCase() || 'PUT';61        if (Utils.isArray(attributes)) {62            finalAttributes = [];63            for (i = attributes.length - 1; i >= 0; i--) {64                obj = Utils.extend({}, attributes[i]);65                self.validateId(obj.id);66                self.validateAttributes(obj);67                finalAttributes.push(obj);68            }69        } else {70            finalAttributes = Utils.extend({}, attributes);71            self.validateId(finalAttributes.id);72            id = finalAttributes.id;73            self.validateAttributes(finalAttributes);74        }75        return self.client.request({ url: self.getUrl(id), method: method, data: JSON.stringify(attributes) });76    };77    Resource.prototype.delete = function (id) {78        // Return a promise that when resolved notifies the status of the DELETE operation79        return this.client.request({ url: this.getUrl(id), method: 'DELETE' });80    };81    Resource.prototype.all = function (data) {82        // Return a promise that when resolved returns all the instances of the resource83        return this.client.request({ url: this.getUrl(), method: 'GET', data: data });84    };85    Resource.prototype.fetch = Resource.prototype.all;86    Resource.prototype.filter = function () {87        return new Query(this, arguments);...

provide-metadata.js

Source: provide-metadata.js

...27          end: fiscalPeriod ? fiscalPeriod.end : ''28        };29        $scope.$watch('period', function(value) {30          ProvideMetadataService.updateFiscalPeriod(value);31          validateAttributes();32        }, true);33        $scope.$watch('attributes.regionCode', function() {34          ProvideMetadataService.updateCountries();35          $scope.geoData = ProvideMetadataService.getGeoData();36        });37        $scope.$watch('attributes', function(newValue, oldValue) {38          if ((newValue === oldValue)) {39            return;40          }41          validateAttributes();42        }, true);43        // Initial validation44        var hasValues = _.chain($scope.attributes)45          .values()46          .filter(function(value) {47            if (_.isString(value)) {48              return value.length > 0;49            }50            return !!value;51          })52          .value()53          .length > 0;54        // If user has populated some attribute values - set dirty flag55        // and validate form56        if (hasValues) {57          $scope.forms.metadata.$setDirty();58        }59        validateAttributes();60        validateAttributes.flush();61      });62    }...

model.js

Source: model.js

...9    this.user_id = user_id;10  }11}12const createArticle = (event, context, callback) => {13  validateAttributes(event, callback);14  const body = JSON.parse(event.body);15  const id = uuid.v1();16  const text = body.text;17  const user_id = context.identity.cognitoIdentityId;18  return new Article(id, user_id, text);19}20const readArticle = (event, callback) => {21  validateAttributes(event, callback);22  const body = JSON.parse(event.body);23  const id = body.article_id;24  return new Article(id);25}26const updateArticle = (event, context, callback) => {27  validateId(event, callback);28  validateAttributes(event, callback);29  const body = JSON.parse(event.body);30  const id = body.article_id;31  const text = body.text;32  const user_id = context.identity.cognitoIdentityId;33  return new Article(id, user_id, text);34}35const deleteArticle = (event, callback) => {36  validateAttributes(event, callback);37  const body = JSON.parse(event.body);38  const id = body.article_id;39  return new Article(id);40}41const validateAttributes = (event, callback) => {42  const body = JSON.parse(event.body);43  if (typeof body.text !== 'string') {44    console.error('Validation Failed');45    callback(new Error('Body did not contain a text property of type string.'));46    process.exit(1);47  }48}49const validateId = (event, callback) => {50  const body = JSON.parse(event.body);...

controllers.js

Source: controllers.js

...19  };20  21  $scope.goToCheckout = function() {22    console.log('goToCheckout')23    if(validateAttributes()) {24      if(Auth.AuthData.hasOwnProperty('uid')) {25        $state.go('app.checkout', {modeIter: 0});26      } else {27        $state.go('app.account', {nextState: 'app.checkout'});28      }29    }30  };31  32  // check if some products have attributes33  // if so, check if the user has made a selection34  function validateAttributes() {35    return Cart.validateAttributes();36  };37  38  // Use to dynamically disable dragging of this side-menu.39  // http://ionicframework.com/docs/angularjs/controllers/side-menu/40  $scope.canDrag = function() {41    if($state.current.name == 'app.product') {42      return false;43    } else {44      return true;45    }46  };47  ...

product.route.js

Source: product.route.js

1const { Router } = require('express');2const { productCompare,productPurchased,productTotalPurchased,compareProductV2} = require('../controllers/product.controller');3const { check } = require('express-validator');4const {validateAttributes} = require('../middlewares/validate-attributes');5const router = Router();6router.post('/compare',[7    check('comsumption', 'The comsumption is mandatory').not().isEmpty(),8    validateAttributes9], productCompare );10router.post('/compare/v2',[11    check('comsumption', 'The comsumption is mandatory').not().isEmpty(),12    validateAttributes13], compareProductV2 );14router.post('/purchase',[15    check('productCode', 'The productCode is mandatory').not().isEmpty(),16    check('productName', 'The productName is mandatory').not().isEmpty(),17    check('cost', 'The totalCost is mandatory').not().isEmpty(),18    check('email', 'The email is mandatory').isEmail(),19    check('name', 'The name is mandatory').not().isEmpty(),20    validateAttributes21], productPurchased );22router.get('/totalPurchased',  productTotalPurchased );...

Using AI Code Generation

1const { validateAttributes } = require('playwright-core/lib/server/frames');2const { Frame } = require('playwright-core/lib/server/frames');3const { Page } = require('playwright-core/lib/server/page');4const frame = new Frame(null, 'frameId', Page);5const attributes = {id: 'test', 'data-test': 'test'};6validateAttributes(frame, attributes);7validateAttributes(frame, {id: 'test'});

Using AI Code Generation

1const { validateAttributes } = require('playwright/lib/server/frames');2const { assert } = require('chai');3const { describe, it } = require('mocha');4describe('validateAttributes', () => {5  it('should return error for invalid attribute', () => {6    const attributes = {

Using AI Code Generation

1const { validateAttributes } = require('playwright/lib/server/dom.js');2const { parseHTML } = require('playwright/lib/server/common/htmlParser.js');3const { assert } = require('playwright/lib/server/common/assert.js');4const { parseSelectors } = require('playwright/lib/server/common/selectors2.js');5const { SelectorEngine } = require('playwright/lib/server/common/selectorEngine.js');6const { ElementHandle } = require('playwright/lib/server/dom.js');7const html = `<html><head></head><body><div id="test" class="foo bar" data-foo="bar"></div></body></html>`;8const engine = new SelectorEngine(document);9const div = document.querySelector('div');10const handle = new ElementHandle(engine, div, 'foo');11const { valid, reason } = validateAttributes(handle, parseSelectors('div#test.foo[data-foo="bar"]'));12assert(valid, reason);13console.log('Test passed');

Using AI Code Generation

1const { validateAttributes } = require('playwright/lib/utils/utils');2const { Playwright } = require('playwright/lib/server/playwright');3const playwright = new Playwright();4const browser = await playwright.chromium.launch();5const page = await browser.newPage();6const selector = 'div';7const attributes = { 'data-testid': 'foo' };8const result = await page.evaluate((selector, attributes) => validateAttributes(document.querySelector(selector), attributes), selector, attributes);9console.log(result);10await browser.close();11await playwright.close();12const { validateAttributes } = require('playwright/lib/utils/utils');13const { Playwright } = require('playwright/lib/server/playwright');14const playwright = new Playwright();15const browser = await playwright.chromium.launch();16const page = await browser.newPage();17const selector = 'div';18const attributes = { 'data-testid': 'foo' };19const result = await page.evaluate((selector, attributes) => validateAttributes(document.querySelector(selector), attributes), selector, attributes);20console.log(result);21await browser.close();22await playwright.close();23const { validateAttributes } = require('playwright/lib/utils/utils');24const { Playwright } = require('playwright/lib/server/playwright');25const playwright = new Playwright();26const browser = await playwright.chromium.launch();27const page = await browser.newPage();28const selector = 'div';29const attributes = { 'data-testid': 'foo' };30const result = await page.evaluate((selector, attributes) => validateAttributes(document.querySelector(selector), attributes), selector, attributes);31console.log(result);32await browser.close();33await playwright.close();34const { validateAttributes } = require('playwright/lib/utils/utils');35const { Play

Using AI Code Generation

1const { validateAttributes } = require('playwright/lib/server/frames');2const { parseSelector } = require('playwright/lib/server/common/selectors');3const { parseModifiers } = require('playwright/lib/server/common/keyboard');4const { parseMouseButtons } = require('playwright/lib/server/common/mouse');5const { parseTimeout } = require('playwright/lib/server/common/utils');6const { parseWaitForOptions } = require('playwright/lib/server/common/timeoutSettings');7const { parseSelectorArray } = require('playwright/lib/server/common/selectors');8const { parseWaitForSelectorOptions } = require('playwright/lib/server/common/timeoutSettings');9const { parseSelectorArray } = require('playwright/lib/server/common/selectors');10const { parseWaitForSelectorOptions } = require('playwright/lib/server/common/timeoutSettings');11const { parseSelectorArray } = require('playwright/lib/server/common/selectors');12const { parseWaitForSelectorOptions } = require('playwright/lib/server/common/timeoutSettings');13const { parseSelectorArray } = require('playwright/lib/server/common/selectors');14const { parseWaitForSelectorOptions } = require('playwright/lib/server/common/timeoutSettings');15const { parseSelectorArray } = require('playwright/lib/server/common/selectors');16const { parseWaitForSelectorOptions } = require('playwright/lib/server/common/timeoutSettings');17const { parseSelectorArray } = require('playwright/lib/server/common/selectors');18const { parseWaitForSelectorOptions } = require('playwright/lib/server/common/timeoutSettings');19const { parseSelectorArray } = require('playwright/lib/server/common/selectors');20const { parseWaitForSelectorOptions } = require('playwright/lib/server/common/timeoutSettings');21const { parseSelectorArray } = require('playwright/lib/server/common/selectors');22const { parseWaitForSelectorOptions } = require('playwright/lib/server/common/timeoutSettings');23const { parseSelectorArray } = require('playwright/lib/server/common/selectors');24const { parseWaitForSelectorOptions } = require('playwright/lib/server/common/timeoutSettings');25const { parseSelectorArray } = require('playwright/lib/server/common/selectors');26const { parseWaitForSelectorOptions } = require('playwright/lib/server/common/timeoutSettings');27const { parseSelectorArray } = require('playwright/lib/server/common/selectors');28const { parseWaitForSelectorOptions } = require('play

Using AI Code Generation

1const { validateAttributes } = require('playwright/lib/server/dom.js');2const { parseSelector } = require('playwright/lib/server/common/selectors.js');3const { parseSelectorToSteps } = require('playwright/lib/server/common/selectors2.js');4const selector = 'css=div >> text=hello';5const parsedSelector = parseSelector(selector);6const steps = parseSelectorToSteps(parsedSelector);7const result = validateAttributes(steps);8console.log(result);9{10    {11    }12}13Selectors 2.0 example: Multiple selectors with engines, text, attributes and visibility (2)

Using AI Code Generation

1const { validateAttributes } = require('playwright/lib/internal/protocol');2const { assert } = require('chai');3const expectedAttributes = {4  'aria-label': {5  },6  'aria-labelledby': {7  },8};9const actualAttributes = {10};11assert.doesNotThrow(() => validateAttributes(expectedAttributes, actualAttributes));12const { validateAttributes } = require('playwright/lib/internal/protocol');13const { assert } = require('chai');14const expectedAttributes = {15  'aria-label': {16  },17  'aria-labelledby': {18  },19};20const actualAttributes = {21};22assert.doesNotThrow(() => validateAttributes(expectedAttributes, actualAttributes));23const { validateAttributes } = require('playwright/lib/internal/protocol');24const { assert } = require('chai');25const expectedAttributes = {26  'aria-label': {27  },28  'aria-labelledby': {29  },30};31const actualAttributes = {32};33assert.doesNotThrow(() => validateAttributes(expectedAttributes, actualAttributes));34const { validateAttributes } = require('playwright/lib/internal/protocol');35const { assert } = require('chai');36const expectedAttributes = {37  'aria-label': {38  },39  'aria-labelledby': {40  },41};42const actualAttributes = {

Using AI Code Generation

1const { validateAttributes } = require('playwright/lib/server/chromium/crNetworkManager');2const { assert } = require('console');3const { validate } = require('jsonschema');4const expectedAttributes = {5    "headers": {6    },7};8const actualAttributes = {9    "headers": {10    },11};12const result = validateAttributes(expectedAttributes, actualAttributes);13assert(result);14const actualAttributes2 = {15    "headers": {16    },17};18const result2 = validateAttributes(expectedAttributes, actualAttributes2);19assert(!result2);20const actualAttributes3 = {21    "headers": {22    },23};24const expectedAttributes2 = {25    "headers": {26    },27    "extra": {28    }29};30const result3 = validateAttributes(expectedAttributes2, actualAttributes3);31assert(result3);32const actualAttributes4 = {33    "headers": {34    },35};36const expectedAttributes3 = {37    "headers": {38    },39    "extra": {40    }41};42const result4 = validateAttributes(expectedAttributes3, actualAttributes4);43assert(!result4);44const actualAttributes5 = {

StackOverFlow community discussions

Questions

Discussion

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

firefox browser does not start in playwright

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

firefox browser does not start in playwright

Running Playwright in Azure Function

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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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.