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How to use startCSSCoverage method in Playwright Internal

Best JavaScript code snippet using playwright-internal

coverage.spec.js

Source:coverage.spec.js

...118    });119  });120  describe('CSSCoverage', function() {121    it('should work', async function({page, server}) {122      await page.coverage.startCSSCoverage();123      await page.goto(server.PREFIX + '/csscoverage/simple.html');124      const coverage = await page.coverage.stopCSSCoverage();125      expect(coverage.length).toBe(1);126      expect(coverage[0].url).toContain('/csscoverage/simple.html');127      expect(coverage[0].ranges).toEqual([128        {start: 1, end: 22}129      ]);130      const range = coverage[0].ranges[0];131      expect(coverage[0].text.substring(range.start, range.end)).toBe('div { color: green; }');132    });133    it('should report sourceURLs', async function({page, server}) {134      await page.coverage.startCSSCoverage();135      await page.goto(server.PREFIX + '/csscoverage/sourceurl.html');136      const coverage = await page.coverage.stopCSSCoverage();137      expect(coverage.length).toBe(1);138      expect(coverage[0].url).toBe('nicename.css');139    });140    it('should report multiple stylesheets', async function({page, server}) {141      await page.coverage.startCSSCoverage();142      await page.goto(server.PREFIX + '/csscoverage/multiple.html');143      const coverage = await page.coverage.stopCSSCoverage();144      expect(coverage.length).toBe(2);145      coverage.sort((a, b) => a.url.localeCompare(b.url));146      expect(coverage[0].url).toContain('/csscoverage/stylesheet1.css');147      expect(coverage[1].url).toContain('/csscoverage/stylesheet2.css');148    });149    it('should report stylesheets that have no coverage', async function({page, server}) {150      await page.coverage.startCSSCoverage();151      await page.goto(server.PREFIX + '/csscoverage/unused.html');152      const coverage = await page.coverage.stopCSSCoverage();153      expect(coverage.length).toBe(1);154      expect(coverage[0].url).toBe('unused.css');155      expect(coverage[0].ranges.length).toBe(0);156    });157    it('should work with media queries', async function({page, server}) {158      await page.coverage.startCSSCoverage();159      await page.goto(server.PREFIX + '/csscoverage/media.html');160      const coverage = await page.coverage.stopCSSCoverage();161      expect(coverage.length).toBe(1);162      expect(coverage[0].url).toContain('/csscoverage/media.html');163      expect(coverage[0].ranges).toEqual([164        {start: 17, end: 38}165      ]);166    });167    it('should work with complicated usecases', async function({page, server}) {168      await page.coverage.startCSSCoverage();169      await page.goto(server.PREFIX + '/csscoverage/involved.html');170      const coverage = await page.coverage.stopCSSCoverage();171      expect(JSON.stringify(coverage, null, 2).replace(/:\d{4}\//g, ':<PORT>/')).toBeGolden('csscoverage-involved.txt');172    });173    it('should ignore injected stylesheets', async function({page, server}) {174      await page.coverage.startCSSCoverage();175      await page.addStyleTag({content: 'body { margin: 10px;}'});176      // trigger style recalc177      const margin = await page.evaluate(() => window.getComputedStyle(document.body).margin);178      expect(margin).toBe('10px');179      const coverage = await page.coverage.stopCSSCoverage();180      expect(coverage.length).toBe(0);181    });182    describe('resetOnNavigation', function() {183      it('should report stylesheets across navigations', async function({page, server}) {184        await page.coverage.startCSSCoverage({resetOnNavigation: false});185        await page.goto(server.PREFIX + '/csscoverage/multiple.html');186        await page.goto(server.EMPTY_PAGE);187        const coverage = await page.coverage.stopCSSCoverage();188        expect(coverage.length).toBe(2);189      });190      it('should NOT report scripts across navigations', async function({page, server}) {191        await page.coverage.startCSSCoverage(); // Enabled by default.192        await page.goto(server.PREFIX + '/csscoverage/multiple.html');193        await page.goto(server.EMPTY_PAGE);194        const coverage = await page.coverage.stopCSSCoverage();195        expect(coverage.length).toBe(0);196      });197    });198    it('should work with a recently loaded stylesheet', async function({page, server}) {199      await page.coverage.startCSSCoverage();200      await page.evaluate(async url => {201        document.body.textContent = 'hello, world';202        const link = document.createElement('link');203        link.rel = 'stylesheet';204        link.href = url;205        document.head.appendChild(link);206        await new Promise(x => link.onload = x);207      }, server.PREFIX + '/csscoverage/stylesheet1.css');208      const coverage = await page.coverage.stopCSSCoverage();209      expect(coverage.length).toBe(1);210    });211  });...

coverage.js

Source:coverage.js

...152  }153)154test.serial('CSSCoverage should work', async t => {155  const { page, server } = t.context156  await page.coverage.startCSSCoverage()157  await page.goto(server.PREFIX + '/csscoverage/simple.html')158  const coverage = await page.coverage.stopCSSCoverage()159  t.is(coverage.length, 1)160  t.true(coverage[0].url.includes('/csscoverage/simple.html'))161  t.deepEqual(coverage[0].ranges, [{ start: 1, end: 22 }])162  const range = coverage[0].ranges[0]163  t.is(164    coverage[0].text.substring(range.start, range.end),165    'div { color: green; }'166  )167})168test.serial('CSSCoverage should report sourceURLs', async t => {169  const { page, server } = t.context170  await page.coverage.startCSSCoverage()171  await page.goto(server.PREFIX + '/csscoverage/sourceurl.html')172  const coverage = await page.coverage.stopCSSCoverage()173  t.is(coverage.length, 1)174  t.is(coverage[0].url, 'nicename.css')175})176test.serial('CSSCoverage should report multiple stylesheets', async t => {177  const { page, server } = t.context178  await page.coverage.startCSSCoverage()179  await page.goto(server.PREFIX + '/csscoverage/multiple.html')180  const coverage = await page.coverage.stopCSSCoverage()181  t.is(coverage.length, 2)182  coverage.sort((a, b) => a.url.localeCompare(b.url))183  t.true(coverage[0].url.includes('/csscoverage/stylesheet1.css'))184  t.true(coverage[1].url.includes('/csscoverage/stylesheet2.css'))185})186test.serial(187  'CSSCoverage should report stylesheets that have no coverage',188  async t => {189    const { page, server } = t.context190    await page.coverage.startCSSCoverage()191    await page.goto(server.PREFIX + '/csscoverage/unused.html')192    const coverage = await page.coverage.stopCSSCoverage()193    t.is(coverage.length, 1)194    t.is(coverage[0].url, 'unused.css')195    t.is(coverage[0].ranges.length, 0)196  }197)198test.serial('CSSCoverage should work with media queries', async t => {199  const { page, server } = t.context200  await page.coverage.startCSSCoverage()201  await page.goto(server.PREFIX + '/csscoverage/media.html')202  const coverage = await page.coverage.stopCSSCoverage()203  t.is(coverage.length, 1)204  t.true(coverage[0].url.includes('/csscoverage/media.html'))205  t.deepEqual(coverage[0].ranges, [{ start: 17, end: 38 }])206})207test.serial('CSSCoverage should work with complicated usecases', async t => {208  const { page, server } = t.context209  await page.coverage.startCSSCoverage()210  await page.goto(server.PREFIX + '/csscoverage/involved.html')211  const coverage = await page.coverage.stopCSSCoverage()212  t.context.toBeGolden(213    t,214    JSON.stringify(coverage, null, 2).replace(/:\d{4}\//g, ':<PORT>/'),215    'csscoverage-involved.txt'216  )217})218test.serial('CSSCoverage should ignore injected stylesheets', async t => {219  const { page, server } = t.context220  await page.coverage.startCSSCoverage()221  await page.addStyleTag({ content: 'body { margin: 10px;}' })222  // trigger style recalc223  const margin = await page.evaluate(224    () => window.getComputedStyle(document.body).margin225  )226  t.is(margin, '10px')227  const coverage = await page.coverage.stopCSSCoverage()228  t.is(coverage.length, 0)229})230test.serial(231  'CSSCoverage - resetOnNavigation: should report stylesheets across navigations',232  async t => {233    const { page, server } = t.context234    await page.coverage.startCSSCoverage({ resetOnNavigation: false })235    await page.goto(server.PREFIX + '/csscoverage/multiple.html')236    await page.goto(server.EMPTY_PAGE)237    const coverage = await page.coverage.stopCSSCoverage()238    t.is(coverage.length, 2)239  }240)241test.serial(242  'CSSCoverage - resetOnNavigation: should NOT report scripts across navigations',243  async t => {244    const { page, server } = t.context245    await page.coverage.startCSSCoverage() // Enabled by default.246    await page.goto(server.PREFIX + '/csscoverage/multiple.html')247    await page.goto(server.EMPTY_PAGE)248    const coverage = await page.coverage.stopCSSCoverage()249    t.is(coverage.length, 0)250  }251)252test.serial(253  'CSSCoverage should work with a recently loaded stylesheet',254  async t => {255    const { page, server } = t.context256    await page.coverage.startCSSCoverage()257    await page.evaluate(async url => {258      document.body.textContent = 'hello, world'259      const link = document.createElement('link')260      link.rel = 'stylesheet'261      link.href = url262      document.head.appendChild(link)263      await new Promise(x => (link.onload = x))264    }, server.PREFIX + '/csscoverage/stylesheet1.css')265    const coverage = await page.coverage.stopCSSCoverage()266    t.is(coverage.length, 1)267  }...

setup.test.js

Source:setup.test.js

...8    const page = await browser.newPage()9    // Enable both JavaScript and CSS coverage10    await Promise.all([11        page.coverage.startJSCoverage([false, false]),12        page.coverage.startCSSCoverage()13    ]);14    await page.goto(15        'file:///Users/anirudhsharma/Documents/Semester8_College/STAD/Final%20Project/MonopolyTestFinalProj/monopoly-master1/index.html'16    )17    await page.click('#setup > div:nth-child(10) > input[type=button]')18    const [jsCoverage, cssCoverage] = await Promise.all([19        page.coverage.stopJSCoverage(),20        page.coverage.stopCSSCoverage(),21    ]);22    pti.write([...jsCoverage, ...cssCoverage], { includeHostname: true , storagePath: './.nyc_output' })23    await browser.close()24})25test("test start game click - 4 players", async () => {26    const browser = await puppeteer.launch({27    })28    const page = await browser.newPage()29    // Enable both JavaScript and CSS coverage30    await Promise.all([31        page.coverage.startJSCoverage([false, false]),32        page.coverage.startCSSCoverage()33    ]);34    await page.goto(35        'file:///Users/anirudhsharma/Documents/Semester8_College/STAD/Final%20Project/MonopolyTestFinalProj/monopoly-master1/index.html'36    )37    const [jsCoverage, cssCoverage] = await Promise.all([38        page.coverage.stopJSCoverage(),39        page.coverage.stopCSSCoverage(),40    ]);41    pti.write([...jsCoverage, ...cssCoverage], { includeHostname: true , storagePath: './.nyc_output' })42    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  await page.coverage.startCSSCoverage();6  const coverage = await page.coverage.stopCSSCoverage();7  console.log(coverage);8  await browser.close();9})();10const { chromium } = require('playwright');11(async () => {12  const browser = await chromium.launch();13  const page = await browser.newPage();14  await page.coverage.startJSCoverage();15  const coverage = await page.coverage.stopJSCoverage();16  console.log(coverage);17  await browser.close();18})();19const { chromium } = require('playwright');20(async () => {21  const browser = await chromium.launch();22  const page = await browser.newPage();23  await page.coverage.startJSCoverage();24  const coverage = await page.coverage.stopJSCoverage();25  console.log(coverage);26  await browser.close();27})();28const { chromium } = require('playwright');29(async () => {30  const browser = await chromium.launch();31  const page = await browser.newPage();32  await page.coverage.startJSCoverage();33  const coverage = await page.coverage.stopJSCoverage();34  console.log(coverage);35  await browser.close();36})();37const { chromium } = require('playwright');38(async () => {39  const browser = await chromium.launch();40  const page = await browser.newPage();41  await page.coverage.startJSCoverage();42  const coverage = await page.coverage.stopJSCoverage();43  console.log(coverage);44  await browser.close();45})();46const { chromium } = require('playwright');47(async () => {48  const browser = await chromium.launch();49  const page = await browser.newPage();

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  const client = await page.context().newCDPSession(page);7  await client.send('CSS.startCSSCoverage');8  const coverage = await client.send('CSS.stopCSSCoverage');9  console.log(coverage);10  await browser.close();11})();12[ { styleSheetId: '1',13    ranges: [ { start: 0, end: 0 } ],14    text: '' },15  { styleSheetId: '2',16    ranges: [ { start: 0, end: 0 } ],17    text: '' },18  { styleSheetId: '3',19    ranges: [ { start: 0, end: 0 } ],20    text: '' },21  { styleSheetId: '4',22    ranges: [ { start: 0, end: 0 } ],23    text: '' },24  { styleSheetId: '5',25    ranges: [ { start: 0, end: 0 } ],26    text: '' },27  { styleSheetId: '6',28    ranges: [ { start: 0, end: 0 } ],29    text: '' },30  { styleSheetId: '7',31    ranges: [ { start: 0

Using AI Code Generation

1const { startCSSCoverage } = require('playwright/lib/server/chromium/crPage');2const { chromium } = require('playwright');3const fs = require('fs');4(async () => {5  const browser = await chromium.launch();6  const context = await browser.newContext();7  const page = await context.newPage();8  const client = await page.context().newCDPSession(page);9  await client.send('Page.enable');10  await client.send('CSS.enable');11  await startCSSCoverage(client);12  const coverage = await client.send('CSS.stopCSSCoverage');13  fs.writeFileSync('./coverage.json', JSON.stringify(coverage, null, 2));14  await browser.close();15})();16{17    {18        {19        },20        {21        }22    }23}24const { stopCSSCoverage } = require('playwright/lib/server/chromium/crPage');25const { chromium } = require('playwright');26const fs = require('fs');27(async () => {28  const browser = await chromium.launch();29  const context = await browser.newContext();30  const page = await context.newPage();31  const client = await page.context().newCDPSession(page);32  await client.send('Page.enable');33  await client.send('CSS.enable');34  await startCSSCoverage(client);35  const coverage = await stopCSSCoverage(client);36  fs.writeFileSync('./coverage.json', JSON.stringify(coverage, null, 2));37  await browser.close();38})();39{40    {41        {42        },43        {44        }45    }46}47const { startJSCoverage } = require('playwright/lib

Using AI Code Generation

1const { startCSSCoverage } = require('playwright/lib/server/chromium/crCoverage');2const { chromium } = require('playwright');3const fs = require('fs');4const path = require('path');5(async () => {6  const browser = await chromium.launch();7  const context = await browser.newContext();8  const page = await context.newPage();9  const cssCoverage = await startCSSCoverage(page);10  const coverage = await cssCoverage.stop();11  const css = coverage.map((entry) => entry.text).join('\n');12  fs.writeFileSync(path.join(__dirname, 'styles.css'), css);13  await browser.close();14})();

Using AI Code Generation

1const { startCSSCoverage } = require('playwright/lib/server/chromium/crCoverage');2const { chromium } = require('playwright');3const { Page } = require('playwright/lib/server/page');4const { helper } = require('playwright/lib/helper');5const { assert } = require('console');6(async () => {7  const browser = await chromium.launch({ headless: false, args: ['--remote-debugging-port=9222'] });8  const context = await browser.newContext();9  const page = await context.newPage();10  await page.evaluate(() => {11    const link = document.createElement('link');12    link.rel = 'stylesheet';13    document.head.appendChild(link);14  });15  const cssCoverage = await startCSSCoverage(page);16  const coverage = await cssCoverage.stop();17  console.log(coverage);18  await browser.close();19})();

Playwright tutorial

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Chapters:

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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.
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