Unlock 30% off on Manual Testing Annual Plans this Holiday Season. 
Use Code: LCMYEARENDEXCL30
Use Code: LCMYEARENDEXCL30Check icon
Copied to Clipboard!
How to use streamToString method in Playwright Internal
Best JavaScript code snippet using playwright-internal
streamTransform.test.js
Source:streamTransform.test.js 
1import { Readable } from 'stream';2import transformStream from './streamTransform';3function streamToString(stream) {4 const chunks = [];5 return new Promise((resolve, reject) => {6 stream.on('data', (chunk) => chunks.push(chunk));7 stream.on('error', reject);8 stream.on('end', () => resolve(Buffer.concat(chunks).toString()));9 });10}11describe('index', () => {12 describe('transformStream()', () => {13 let inputStream;14 let transformedStream;15 let values;16 let expectedResult;17 let count;18 let onMessage;19 beforeEach(() => {20 count = 0;21 values = [22 { value: 1, type: 'begin' },23 { value: 2, type: 'hit' },24 { value: 3, type: 'hit' },25 { value: 4, type: 'end' }26 ];27 expectedResult = [28 JSON.stringify({ value: 2, type: 'begin' }),29 JSON.stringify({ value: 4, type: 'hit' }),30 JSON.stringify({ value: 6, type: 'hit' }),31 JSON.stringify({ value: 8, type: 'end' })32 ]33 .join('\n')34 .concat('\n');35 onMessage = async (message) => ({36 ...message,37 value: message.value * 238 });39 });40 describe('When transform operation receives no chunk', () => {41 beforeEach(() => {42 inputStream = new Readable({43 read() {44 this.push(null);45 }46 });47 transformedStream = transformStream({48 stream: inputStream,49 onMessage50 });51 });52 it('should return correct transformed stream', async () => {53 const buffer = await streamToString(transformedStream);54 expect(buffer).toBe('');55 });56 });57 describe('When transform operation receives normal chunk', () => {58 beforeEach(() => {59 inputStream = new Readable({60 read() {61 this.push(JSON.stringify(values[count]));62 count += 1;63 if (count === values.length) {64 this.push(null);65 }66 }67 });68 transformedStream = transformStream({69 stream: inputStream,70 onMessage71 });72 });73 it('should return correct transformed stream', async () => {74 const buffer = await streamToString(transformedStream);75 expect(buffer).toBe(expectedResult);76 });77 });78 describe('When input stream has multiple newlines in chunk', () => {79 beforeEach(() => {80 inputStream = new Readable({81 read() {82 this.push(`${JSON.stringify(values[count])}\n\n\n`);83 count += 1;84 if (count === values.length) {85 this.push(null);86 }87 }88 });89 transformedStream = transformStream({90 stream: inputStream,91 onMessage92 });93 });94 it('should return correct transformed stream', async () => {95 const buffer = await streamToString(transformedStream);96 expect(buffer).toBe(expectedResult);97 });98 });99 describe('When input stream has newline between chunk', () => {100 beforeEach(() => {101 inputStream = new Readable({102 read() {103 const chunks = `${JSON.stringify(values[count])}`.split(',');104 this.push(chunks[0]);105 this.push(`,${chunks[1]}\n`);106 count += 1;107 if (count === values.length) {108 this.push(null);109 }110 }111 });112 transformedStream = transformStream({113 stream: inputStream,114 onMessage115 });116 });117 it('should return correct transformed stream', async () => {118 const buffer = await streamToString(transformedStream);119 expect(buffer).toBe(expectedResult);120 });121 });122 describe('When input stream has non JSON object between chunks', () => {123 const nonJSONObject = '-,a.';124 beforeEach(() => {125 inputStream = new Readable({126 read() {127 this.push(`${nonJSONObject}\n`);128 this.push(JSON.stringify(values[count]));129 count += 1;130 if (count === values.length) {131 this.push(null);132 }133 }134 });135 transformedStream = transformStream({136 stream: inputStream,137 onMessage138 });139 });140 it('should return correct transformed stream and filter non parse objects', async () => {141 const buffer = await streamToString(transformedStream);142 expect(buffer).toBe(expectedResult);143 });144 });145 describe('When input stream has an error to transform one chunk', () => {146 let onFailure;147 beforeEach(() => {148 inputStream = new Readable({149 read() {150 this.push(JSON.stringify(values[count]));151 count += 1;152 if (count === values.length) {153 this.push(null);154 }155 }156 });157 onMessage = async (message) => {158 if (message.value <= 2) {159 throw new Error('error');160 }161 return {162 ...message,163 value: message.value * 2164 };165 };166 onFailure = jest.fn();167 transformedStream = transformStream({168 stream: inputStream,169 onMessage,170 onFailure171 });172 expectedResult = [173 JSON.stringify({ value: 1, type: 'begin' }),174 JSON.stringify({ value: 2, type: 'hit' }),175 JSON.stringify({ value: 6, type: 'hit' }),176 JSON.stringify({ value: 8, type: 'end' })177 ]178 .join('\n')179 .concat('\n');180 });181 it('should return correct stream with no change in the first two chunk', async () => {182 const buffer = await streamToString(transformedStream);183 expect(buffer).toBe(expectedResult);184 expect(onFailure).toHaveBeenCalledTimes(2);185 const firstCall = onFailure.mock.calls[0];186 const secondCall = onFailure.mock.calls[1];187 expect(firstCall[0].message).toBe('error');188 expect(firstCall[1]).toStrictEqual({189 value: 1,190 type: 'begin'191 });192 expect(secondCall[0].message).toBe('error');193 expect(secondCall[1]).toStrictEqual({194 value: 2,195 type: 'hit'196 });...
test.spec.js
Source:test.spec.js
...77})78describe('vuetify preset', function () {79 it('should work if there is no semver tag', async () => {80 preparing(1)81 const changelog = await streamToString(82 conventionalChangelogCore({ config: preset })83 )84 expect(changelog).toMatchSnapshot()85 })86 it('should replace #[0-9]+ with GitHub issue URL', async () => {87 preparing(2)88 const changelog = await streamToString(89 conventionalChangelogCore({ config: preset })90 )91 expect(changelog).toMatchSnapshot()92 })93 it('should remove the issues that already appear in the subject', async () => {94 preparing(3)95 const changelog = await streamToString(96 conventionalChangelogCore({ config: preset })97 )98 expect(changelog).toMatchSnapshot()99 })100 it('should replace @username with GitHub user URL', async () => {101 preparing(4)102 const changelog = await streamToString(103 conventionalChangelogCore({ config: preset })104 )105 expect(changelog).toMatchSnapshot()106 })107 it('should not discard commit if there is BREAKING CHANGE', async () => {108 preparing(5)109 const changelog = await streamToString(110 conventionalChangelogCore({ config: preset })111 )112 expect(changelog).toMatchSnapshot()113 })114 it('should work if there is a semver tag', async () => {115 preparing(6)116 const changelog = await streamToString(117 conventionalChangelogCore({118 config: preset,119 outputUnreleased: true,120 })121 )122 expect(changelog).to.include('some more features')123 expect(changelog).to.not.include('BREAKING')124 })125 it('should only replace with link to user if it is an username', async () => {126 preparing(7)127 const changelog = await streamToString(128 conventionalChangelogCore({ config: preset })129 )130 expect(changelog).toMatchSnapshot()131 })132 it('parses both default (Revert "<subject>") and custom (revert: <subject>) revert commits', async () => {133 preparing(8)134 const changelog = await streamToString(135 conventionalChangelogCore({ config: preset })136 )137 expect(changelog).toMatchSnapshot()138 })...
test-streamprofile.js
Source:test-streamprofile.js
...97 'confidence',98 ];99 assert.doesNotThrow(() => {100 for (let i = rs2.stream.STREAM_ANY; i < rs2.stream.STREAM_COUNT; i++) {101 let res = rs2.stream.streamToString(i);102 assert.equal(res, streams[i]);103 }104 });105 });106 it('Testing method streamToString - with two arguments', () => {107 assert.throws(() => {108 rs2.stream.streamToString(1, 1);109 });110 });111 it('Testing method streamToString - without argument', () => {112 assert.throws(() => {113 rs2.stream.streamToString();114 });115 });116 it('Testing method streamToString - with stream string', () => {117 const streams = [118 'stream_any',119 'stream_depth',120 'stream_color',121 'stream_infrared',122 'stream_fisheye',123 'stream_gyro',124 'stream_accel',125 'stream_gpio',126 'stream_pose',127 'stream_confidence',128 ];129 streams.forEach((s) => {130 assert.doesNotThrow(() => {131 rs2.stream.streamToString(rs2.stream[s]);132 });133 });134 });...
index.test.ts
Source:index.test.ts
...6describe('streamTag', () => {7 it('handles strings-only correctly', () => {8 const stream = streamTag`test`;910 return streamToString(stream).then(string => {11 expect(string).toBe('test');12 });13 });1415 it('handles empty templates correctly', () => {16 const stream = streamTag``;1718 return streamToString(stream).then(string => {19 expect(string).toBe('');20 });21 });2223 it('handles falsy templates correctly', () => {24 const stream = streamTag`${undefined}${null}${false}`;2526 return streamToString(stream).then(string => {27 expect(string).toBe('');28 });29 });3031 it('handles string interpolations correctly', () => {32 const stream = streamTag`test${'test'}`;3334 return streamToString(stream).then(string => {35 expect(string).toBe('testtest');36 });37 });3839 it('handles number interpolations correctly', () => {40 const stream = streamTag`${0}test${9}`;4142 return streamToString(stream).then(string => {43 expect(string).toBe('0test9');44 });45 });4647 it('handles promise interpolations correctly', () => {48 const stream = streamTag`x${Promise.resolve('test')}x`;4950 return streamToString(stream).then(string => {51 expect(string).toBe('xtestx');52 });53 });5455 it('handles nested streams correctly', () => {56 const stream = streamTag`x${streamTag`test`}x`;5758 return streamToString(stream).then(string => {59 expect(string).toBe('xtestx');60 });61 });6263 it('handles Buffers correctly', () => {64 const stream = streamTag`x${Buffer.from('test')}x`;6566 return streamToString(stream).then(string => {67 expect(string).toBe('xtestx');68 });69 });7071 it('handles deferred interolations correctly', () => {72 const stream = streamTag`73 ${() => 'test'}74 ${() => Buffer.from('test')}75 ${() => Promise.resolve('test')}76 ${() => streamTag`test`}77 `;7879 const output = `80 test81 test82 test83 test84 `8586 return streamToString(stream).then(string => {87 expect(string).toBe(output);88 });89 });9091 describe('React SSR Integration', () => {92 it('correctly interpolates renderToNodeStream', () => {93 const tree = createElement('div', { className: 'test' }, (94 createElement('h1', {}, 'Hello World!')95 ));9697 const stream = streamTag`98 <html>99 <body>100 ${renderToNodeStream(tree)}101 </body>102 </html>103 `;104105 return streamToString(stream).then(string => {106 expect(string).toMatchSnapshot();107 });108 });109 });
...
types.js
Source:types.js
2const assert = require('assert')3const { streamToString } = require('../utils')4const render = require('../lib')5test('regular template string', async () => {6 const result = await streamToString(render`test`)7 assert.strictEqual(result, 'test')8 expect(result).toMatchSnapshot()9})10test('a sync promise', async () => {11 const result = await streamToString(render`1${Promise.resolve('2')}3`)12 assert.strictEqual(result, '123')13 expect(result).toMatchSnapshot()14})15test('an async promise', async () => {16 const promise1 = new Promise(resolve => setImmediate(() => resolve('asdf')))17 const promise2 = new Promise(resolve => setImmediate(() => resolve('1234')))18 const result = await streamToString(render`__1__${promise1}__2__${promise2}__3__`)19 assert.strictEqual(result, '__1__asdf__2__1234__3__')20 expect(result).toMatchSnapshot()21})22test('a promise-returning function', async () => {23 const fn = () => new Promise(resolve => setImmediate(() => resolve('asdf')))24 const result = await streamToString(render`__1__${fn}__2__`)25 assert.strictEqual(result, '__1__asdf__2__')26 expect(result).toMatchSnapshot()27})28test('an async function', async () => {29 const fn = async () => {30 await new Promise(resolve => setImmediate(resolve))31 return 'asdf'32 }33 const result = await streamToString(render`__1__${fn}__2__`)34 assert.strictEqual(result, '__1__asdf__2__')35 expect(result).toMatchSnapshot()36})37test('a stream', async () => {38 const stream = new PassThrough()39 stream.write('asdf')40 stream.end()41 const result = await streamToString(render`__1__${stream}__2__`)42 assert.strictEqual(result, '__1__asdf__2__')43 expect(result).toMatchSnapshot()...
kube.js
Source:kube.js
...8async function getKubeVersion() {9 try {10 const versionCmd = spawn(KUBECTL, K_VERSION);11 versionCmd.on('error', () => exitWithError(NO_KUBECTL_ERROR));12 return (await streamToString(versionCmd.stdout)).split('v')[1].trim();13 } catch(e) {14 exitWithError(NO_KUBECTL_ERROR);15 }16}17async function getNamespaces() {18 const cmd = spawn(KUBECTL, K_GET_NS);19 const output = JSON.parse(await streamToString(cmd.stdout));20 return output.items.map(n => n.metadata.name);21}22async function getServices(namespace) {23 const cmd = spawn(KUBECTL, K_GET_SVC(namespace));24 const output = JSON.parse(await streamToString(cmd.stdout));25 return output.items.map(n => n.metadata.name);26}27async function getPorts(namespace, service) {28 const cmd = spawn(KUBECTL, `-n=${namespace} get svc ${service} -ojson`.split(' '));29 const output = JSON.parse(await streamToString(cmd.stdout));30 return output.spec.ports.map(p => p.port);31}32function portForward({ namespace, service, localPort, targetPort }) {33 return spawn(KUBECTL, `port-forward -n=${namespace} svc/${service} ${localPort}:${targetPort}`.split(' '));34}...
streamToString.test.ts
Source:streamToString.test.ts
1import { ReadStream } from 'fs';2import { streamToString } from '@/util/streamToString';3describe('streamToString', () => {4 test('streamToString(stream)', async () => {5 const buf = Buffer.from('HOGE');6 const stream = ReadStream.from(buf) as ReadStream;7 await expect(streamToString(stream)).resolves.toBe('HOGE');8 });9 test('streamToString(stream) invalid data', async () => {10 const buf = Buffer.from([]);11 const stream = ReadStream.from(buf) as ReadStream;12 await expect(streamToString(stream)).rejects.toThrow();13 });...
Using AI Code Generation
1const { streamToString } = require('@playwright/test/lib/utils/utils');2const { chromium } = require('playwright');3(async () => {4 const browser = await chromium.launch();5 const context = await browser.newContext();6 const page = await context.newPage();7 const element = await page.$('body');8 const stream = await element.screenshotStream();9 const screenshot = await streamToString(stream);10 console.log(screenshot);11 await browser.close();12})();13const { streamToString } = require('@playwright/test/lib/utils/utils');14module.exports = {15};16And in my test file, I have imported this method from utils.js17const { chromium } = require('playwright');18const { streamToString } = require('./utils');19(async () => {20 const browser = await chromium.launch();21 const context = await browser.newContext();22 const page = await context.newPage();23 const element = await page.$('body');24 const stream = await element.screenshotStream();25 const screenshot = await streamToString(stream);26 console.log(screenshot);27 await browser.close();28})();
Using AI Code Generation
1const { streamToString } = require('playwright/lib/utils/utils');2const fs = require('fs');3const path = require('path');4const { chromium } = require('playwright');5(async () => {6 const browser = await chromium.launch();7 const context = await browser.newContext();8 const page = await context.newPage();9 const screenshot = await page.screenshot();10 const data = await streamToString(screenshot);11 fs.writeFileSync(path.join(__dirname, 'google.png'), data);12 await browser.close();13})();14const { Readable } = require('stream');15const { helper } = require('./helper');16module.exports.streamToString = async stream => {17 if (stream instanceof Readable)18 return await helper.readStream(stream);19 return stream.toString();20};21const { Readable } = require('stream');22module.exports.helper = {23 readStream: stream => new Promise((fulfill, reject) => {24 let data = '';25 stream.on('data', chunk => data += chunk);26 stream.on('end', () => fulfill(data));27 stream.on('error', reject);28 }),29};
Using AI Code Generation
1const { streamToString } = require('playwright/lib/utils/utils');2const fs = require('fs');3const path = require('path');4const { chromium } = require('playwright');5(async () => {6 const browser = await chromium.launch();7 const context = await browser.newContext();8 const page = await context.newPage();9 const screenshot = await page.screenshot({ fullPage: true });10 const screenshotPath = path.join(__dirname, 'screenshot.png');11 const fileHandle = await fs.promises.open(screenshotPath, 'w');12 await fileHandle.write(await streamToString(screenshot));13 await fileHandle.close();14 await browser.close();15})();16const { streamToString } = require('playwright/lib/utils/utils');17const fs = require('fs');18const path = require('path');19const { chromium } = require('playwright');20(async () => {21 const browser = await chromium.launch();22 const context = await browser.newContext();23 const page = await context.newPage();24 const screenshot = await page.screenshot({ fullPage: true });25 const screenshotPath = path.join(__dirname, 'screenshot.png');26 const fileHandle = await fs.promises.open(screenshotPath, 'w');27 await fileHandle.write(await streamToString(screenshot));28 await fileHandle.close();29 await browser.close();30})();31const { streamToString } = require('playwright/lib/utils/utils');32const fs = require('fs');33const path = require('path');34const { chromium } = require('playwright');35(async () => {36 const browser = await chromium.launch();37 const context = await browser.newContext();38 const page = await context.newPage();39 const screenshot = await page.screenshot({ fullPage: true });40 const screenshotPath = path.join(__dirname, 'screenshot.png');41 const fileHandle = await fs.promises.open(screenshotPath, 'w');42 await fileHandle.write(await streamToString(screenshot));43 await fileHandle.close();44 await browser.close();45})();
Using AI Code Generation
1const { chromium } = require('playwright');2(async () => {3 const browser = await chromium.launch();4 const page = await browser.newPage();5 const html = await page.evaluate(() => document.documentElement.outerHTML);6 const stream = await page.evaluateHandle(() => document.documentElement);7 const string = await stream.evaluate((node) => {8 const stream = new node.ownerDocument.defaultView.ReadableStream({9 start(controller) {10 const encoder = new TextEncoder();11 const text = node.outerHTML;12 const buffer = encoder.encode(text);13 controller.enqueue(buffer);14 controller.close();15 }16 });17 const reader = stream.getReader();18 const decoder = new TextDecoder();19 let result = '';20 return pump();21 function pump() {22 return reader.read().then(({done, value}) => {23 if (done)24 return result;25 result += decoder.decode(value);26 return pump();27 });28 }29 });30 console.log(string === html);31 await browser.close();32})();33const { chromium } = require('playwright');34(async () => {35 const browser = await chromium.launch();36 const page = await browser.newPage();37 const html = await page.evaluate(() => document.documentElement.outerHTML);38 const stream = await page.evaluateHandle(() => document.documentElement);39 const string = await stream.evaluate((node) => {40 const stream = new node.ownerDocument.defaultView.ReadableStream({41 start(controller) {42 const encoder = new TextEncoder();43 const text = node.outerHTML;44 const buffer = encoder.encode(text);45 controller.enqueue(buffer);46 controller.close();47 }48 });49 const reader = stream.getReader();50 const decoder = new TextDecoder();51 let result = '';52 return pump();53 function pump() {54 return reader.read().then(({done, value}) => {55 if (done)56 return result;57 result += decoder.decode(value);58 return pump();59 });60 }61 });62 console.log(string === html);63 await browser.close();64})();65const { chromium } = require('playwright');66(async () => {
Using AI Code Generation
1const { streamToString } = require('playwright/lib/utils/utils');2const fs = require('fs');3(async () => {4 const file = fs.createReadStream('test.txt');5 const content = await streamToString(file);6 console.log(content);7})();8const { streamToString } = require('playwright/lib/utils/utils');9const fs = require('fs');10(async () => {11 const file = fs.createReadStream('test.txt');12 const content = await streamToString(file);13 console.log(content);14})();15const { streamToString } = require('playwright/lib/utils/utils');16const fs = require('fs');17(async () => {18 const file = fs.createReadStream('test.txt');19 const content = await streamToString(file);20 console.log(content);21})();22const { streamToString } = require('playwright/lib/utils/utils');23const fs = require('fs');24(async () => {25 const file = fs.createReadStream('test.txt');26 const content = await streamToString(file);27 console.log(content);28})();29const { streamToString } = require('playwright/lib/utils/utils');30const fs = require('fs');31(async () => {32 const file = fs.createReadStream('test.txt');33 const content = await streamToString(file);34 console.log(content);35})();36const { streamToString } = require('playwright/lib/utils/utils');37const fs = require('fs');38(async () => {39 const file = fs.createReadStream('test.txt');40 const content = await streamToString(file);41 console.log(content);42})();43const { streamToString } = require('playwright/lib/utils/utils');44const fs = require('fs');45(async () => {
Using AI Code Generation
1const { streamToString } = require('playwright');2const stream = require('stream');3const { Readable } = stream;4const readable = new Readable();5readable.push('hello world');6readable.push(null);7const string = await streamToString(readable);8console.log(string);
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.
Run Playwright Internal automation tests on LambdaTest cloud grid
Perform automation testing on 3000+ real desktop and mobile devices online.
Try LambdaTest Now !!
Get 100 minutes of automation test minutes FREE!!
Was this article helpful?
