In the early age of software development, testing was mostly do manually, which could be a time-consuming and tedious operation. These days, there are several tools that can assist automatise the testing summons. One such creature is Puppeteer, which allows you to contain purposes. This guidebook will take a really deep dive into what Puppeteer is and how it can be employ for web scraping and mechanization purposes.

What is Puppeteer, and what are its characteristic

Puppeteer is a Node.js library that allows you to control Chrome or Chromium from the command line. Puppeteer can be used for web scraping, mechanisation, and testing aim. This guide will show you how to use Puppeteer for web scraping and automation purposes.

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Puppeteer is a Node.js library that provides a high-level API to control Chromium or Chrome over the DevTools Protocol. Puppeteer constantly runs headless by nonremittal but can be configure to run full (non-headless) Chrome or Chromium.

Puppeteer offers APIs that allow you to control Chrome or Chromium programmatically. For example, you can use Puppeteer to take screenshots, create PDFs, navigate Page, and more. In improver, Puppeteer can be used for testing use. For example, you can use Puppeteer to chatter on buttons and links, fill out forms, and assert that the expected results are displayed on the page.

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History of Puppeteer

Puppeteer was initially develop by Google to facilitate developer automate their workflow. For model, if you need to take a screenshot of a site, you can use Puppeteer to do it automatically. In addition, Puppeteer can be used for web scratching and examination purposes.

Puppeteer was firstly unloosen in 2017. Since then, it has been gaining constant popularity among developers and QA professionals.

In 2018, Puppeteer was updated with a bit of new features, including the ability to take screenshots of web pages and generate PDFs.

Puppeteer is an open-source project, which means that anyone can contribute to it. This makes Puppeteer an excellent tool for developers and QA professionals.

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Why is Puppeteer a better quiz platform than its peers?

Puppeteer is a great testing platform because it is easy to use, tight, and has a broad range of features.

Puppeteer is easy to use because it is based on the DevTools Protocol, the same protocol utilise by the. This means that if you are really familiar with the Chrome Developer Tools, so you will ensure to get up and running with Puppeteer promptly. In addition, Puppeteer has a number of helper functions that do everyday tasks, such as taking screenshots and creating PDFs, easier to do.

Puppeteer is fast because it uses headless Chrome or Chromium. Headless browsers don & # x27; t have a UI, which means they are faster than traditional browsers. In addition, Puppeteer can run multiple instances of Chrome or Chromium in analog, which further speeds up the testing process.

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Puppeteer has a wide range of lineament that get it an splendid tool for web scratching and automation purposes. For example, Puppeteer can be used to take screenshots, create PDFs, navigate Page, and more. In addition, Puppeteer can be used for screen purposes. For example, you can use Puppeteer to click on buttons and links, fill out forms, and aver that the expected results are displayed on the page.

Difference between Puppeteer and other examination platforms

Puppeteer is a great testing program, but it is not the only one. There are a number of different testing program that you can use for web scraping and automation aim.

Difference between Puppeteer and WebKit/Blink

While Puppeteer is a Node.js automation library, WebKit and Blink are browser engines used by Safari and Chromium, respectively. Puppeteer interact with these engines via DevTools.

Difference between Puppeteer and Selenium

The main difference between Puppeteer and is that Puppeteer is a Node.js library that communicates with Chrome or Chromium browsers forthwith over the debugging lineament, while Selenium negociate browsers over a chromedriver. The chromedriver communicates with the browsers.

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Difference between Puppeteer and PhantomJS

The main deviation between Puppeteer and PhantomJS is that Puppeteer is a Node.js library that provides a high-level API to control headless Chrome or Chromium, while PhantomJS is a brainless web browser based on JavaScript and WebKit/Blink.

Difference between Puppeteer and Nightmare.JS

The principal difference between Puppeteer and Nightmare is that Puppeteer is a Node.js library that provides a high-level API to control headless Chrome or Chromium, while Nightmare is a JavaScript library to render WebPage using Electron for automate browsers. Nightmare can be habituate with Selenium.

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Difference between Puppeteer and Cypress

The main difference between Puppeteer and Cypress is that Puppeteer is a Node.js library that provide a high-level API to control headless Chrome or Chromium, while Cypress is a JavaScript automation framework which provides convenient methods for asynchronous testing.

How to establish Puppeteer

Puppeteer is a Node.js library, which means it can be installed utilise npm, the Node bundle manager. To install Puppeteer, run the next command:

npm install puppeteer

Once Puppeteer has be installed, you can use it in your Node.js scripts.

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How to use Puppeteer for mechanisation

Puppeteer can be used for mechanization purposes. In this section, we will be let you know how to use Puppeteer to automate the process of filling out a web form. We will be using the example of filling out a form on HeadSpin sample code https: //github.com/headspinio/blog-samples running on your local.

First, you ask to install Puppeteer using npm:

npm install puppeteer

Then, you need to cook the sample host environment follow “ Setup ” and “ Run the local server ” subdivision in the:

node server.js

Next, create a file named fill-form.js and add the following codification:

const puppeteer = require ('puppeteer '); (async () = > {const browser = await puppeteer.launch ({headless: false}); const page = await browser.newPage (); const timeout = 5000; page.setDefaultTimeout (timeout); try {await page.goto (`` http: //localhost:8000 ''); await page.waitForSelector (` # fname `, {timeout, seeable: true}); await page.type (` # fname `, ````); await page.type (` # lname `, ````); await Promise.all ([page.click (` input [name= '' nameSubmit ''] `), page.waitForNavigation ()])} catch (err) {console.log (err);} ultimately {await browser.close ();}}) ();

In the code above, we are using Puppeteer to fill out a form on the sampling website that has a first gens comment field and a last name input battlefield. We are utilize the case () function to type textbook in an input battlefield. We are likewise using the click () function to click on a push and the waitForNavigation () function to wait for the page to navigate to the following url before continue. The book saves a screenshot by page.screenshot ().

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To run the code, type the following command in 02-testing-with-puppeteer:

Pro tip: Tools like SUSA can handle this autonomously — upload your app and get results without writing a single test script.

node test/fill-form.js

How to compose and execute tryout with Puppeteer

Puppeteer can be used for pen and executing tests. In this section, we will be permit you know how to use Puppeteer to write a test that verifies that the title of a web page is correct. We will be using the example of testing the title of the web page in the sampling server.

First, you involve to install Puppeteer using npm:

npm install puppeteer

Then, you need to prepare the sample host environment following “ Setup ” and “ Run the local waiter ” sections in the:

node server.js

Next, create a file named test.js and add the next code:

const puppeteer = require ('puppeteer '); (async () = > {const browser = await puppeteer.launch ({headless: mistaken}); const page = await browser.newPage (); const timeout = 5000; page.setDefaultTimeout (timeout); try {await page.goto (`` http: //localhost:8000 ''); look page.waitForSelector (` # fname `, {timeout, seeable: true}); const title = await page.title (); console.log (title);} gimmick (err) {console.log (err);} finally {await browser.close ();}}) ();

In the code above, we are using Puppeteer to test the rubric of the web page in the sample server. We are employ the rubric () part to get the rubric of the page, and so we are using the console.log () function to print it out.

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To run the code, type the next command:

node test/title.js

Using Puppeteer for testing web coating

Puppeteer can be used for testing web applications. In this section, we will show you how to use Puppeteer to screen the login functionality of a web application. We will be using the example of testing the login functionality of the Facebook website.

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First, you necessitate to establish Puppeteer using npm:

npm install puppeteer

Then, you need to prepare the sample server environment follow “ Setup ” and “ Run the local server ” section in the:

node server.js

Next, create a file named test-login.js and add the following code:

const puppeteer = require ('puppeteer '); (async () = > {const browser = await puppeteer.launch ({headless: false}); const page = await browser.newPage (); const timeout = 5000; page.setDefaultTimeout (timeout); try {await page.goto (`` http: //localhost:8000 ''); expect page.waitForSelector (` # fname `, {timeout, visible: true}); wait page.type (` # e-mail `, `` your email ''); await page.type (` # countersign `, `` your word ''); await page.screenshot ({itinerary: `` ./login.png '', fullPage: true}); await Promise.all ([page.click (` input [name= '' loginSubmit ''] `), page.waitForNavigation ()]) const url = await page.url (); if (url! == ` http: //localhost:8000/login `) {throw new Error (` The URL was not http: //localhost:8000/login `);} console.log (url);} match (err) {console.log (err);} finally {await browser.close ();}}) ();

In the codification above, we are utilize Puppeteer to test the login functionality of the sample website. We are using the type () function to typewrite text in an input field and the detent () part to click on a push. We are likewise using the waitForNavigation () function to wait for the page to pilot to the next page before continuing.

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To run the code, typecast the following command:

node test/login.js

How to automate trial with Puppeteer

Automating tests with Puppeteer can help. This section will let you know how to use Puppeteer to automate the test we created in the premature section.

First, create a file named test-login-automated.js and add the following code:

const puppeteer = require ('puppeteer '); (async () = > {const browser = await puppeteer.launch ({headless: mistaken}); const page = await browser.newPage (); const timeout = 5000; page.setDefaultTimeout (timeout); try {await page.goto (`` http: //localhost:8000 ''); await page.waitForSelector (` # fname `, {timeout, seeable: true}); // Fill in email and password fields await page.type (` # email `, `` your e-mail ''); await page.type (` # password `, `` your countersign ''); await page.screenshot ({path: `` ./login.png '', fullPage: true}); await Promise.all ([// Click on login button page.click (` input [name= '' loginSubmit ''] `), // Wait for page to navigate to the next page page.waitForNavigation ()]) // Get url of the page const url = await page.url (); if (url! == ` http: //localhost:8000/login `) {throw new Error (` The URL was not http: //localhost:8000/login `);} console.log (url);} catch (err) {console.log (err);} finally {// Close browser window await browser.close ();}}) ();

In the code above, we are habituate Puppeteer to automate the test we create in the previous section. We are using the filling () function to typewrite in input fields and the click () function to click on a push. We are likewise using the waitForNavigation () function to wait for the page to navigate to the adjacent page.

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To run the code, type the following bidding:

node test/login.js

Best practices for optimizing your tests with Puppeteer

You can follow some best practices to optimize your trial with Puppeteer. In this subdivision, we will be allow you know a list of the best drill for optimizing your tryout.

• Minimizing the number of actions, you perform in each trial is indispensable. This will help meliorate the performance of your tests.
• It is vital to use the waitFor * functions wisely. Overusing these functions can slow down your tests.
• It is all-important to parallelize your trial whenever possible. This will assistimprove the overall performanceof your tests.
• It is all-important to use the headless mode when running your exam. This will help improve the performance of your tests.
• Always keep your trial code up to date with the latest changes in Puppeteer. This will see that your exam are scat correctly.
• Use the supported Node.js versions by the core squad when running your tests. This will ensure that your tests are running correctly.
• Make sure to use a decently configured tryout smuggler when running your tests. This will ensure that your tests are running correctly.
• Make sure to read the Puppeteer support cautiously. This will facilitate you understand how to use Puppeteer correctly. Make sure to read the headless-chrome DoC as easily.

Puppeteer is a powerful tool for and automating browsers. It is an indispensable tool for developers and QA pro. By following the above-written best practices, you can optimise your trial and improve the overall execution of your testing operation.

HeadSpin Puppeteer Integration

HeadSpin is a mobile platform that grant you to test your web pages on real device. It provides several features, such as simulating different net weather and capturing video recordings of your tests.

HeadSpin platform uses Puppeteer to provide accurate and up-to-date test coverage for web Page. This helps ensure that your tests are running correctly.

integrates with Puppeteer to provide a complete testing solvent for web pages. HeadSpin offers a panoptic range of features and tools to help you examine your web page. It is leisurely to use, and this makes it an essential tool for developers and QA professionals.

Examples of real-world tests using Puppeteer

In this section, we are going to let you cognise some examples of real-world tests that have been created expend Puppeteer.

Example 1

The first exemplar is a login test for a web page. This test will occupy in the username and password fields and click on the login push. Then, it will wait for the page to navigate to the next page.

const puppeteer = require ('puppeteer '); (async () = > {const browser = await puppeteer.launch (); const page = await browser.newPage (); await page.goto ('https: //example.com/login '); // filling in the username and watchword fields await page.type (' # username ', 'testuser '); await page.type (' # parole ', 'testpass '); // tick on the login push await page.click (' # login-button '); // wait for the page to voyage to the adjacent page await page.waitForNavigation (); await browser.close ();}) ();

Example 2 - 4

The second example is if a web page hold the correct url. This examination will navigate to the HeadSpin GitHub top and checks if the url is correct. If the url is not right, the examination will miscarry.

The third exemplar is if a web page control a specific element, if the page has an element with the id & quot; your-repos-filter & quot;. If the placeholder of the element is not expected, the test will fail.

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The 5th model is if a web page contains a specific image. This examination will check if the page contains an image with the src & quot; avatars.githubusercontent.com & quot;. If the icon is not found, the test will fail.

const puppeteer = require ('puppeteer '); (async () = > {const browser = await puppeteer.launch ({headless: false}); const page = await browser.newPage (); try {const timeout = 5000; page.setDefaultTimeout (timeout); await page.goto (`` https: //github.com/headspinio ''); const url = await page.url (); if (url! == ` https: //github.com/headspinio `) {throw new Error (` The URL was not https: //github.com/headspinio `);} await page.screenshot ({path: `` ./github-headspinio.png '', fullPage: true}); const repoTab = await page. $ (` a [href $ = '' /orgs/headspinio/repositories ''] `); await repoTab.click (); await page.waitForNavigation (); const placeholder = await page. $ eval (` [id= '' your-repos-filter ''] `, el = > el.getAttribute ('placeholder ')) if (procurator! == ” Find a repository… ”) {throw new Error (` The search placeholder was not 'Find a repository… '. Actual: $ {procurator} `);} await page.screenshot ({path: `` ./github-headspinio-repos.png '', fullPage: true}); const imgSrc = await page. $ eval (` img [alt= '' @ headspinio ''] `, async (el) = > await el.getAttribute ('src ')); if (! imgSrc.startsWith (`` https: //avatars.githubusercontent.com '')) {cast new Error (` The ikon was not an embodiment image `);}} match (err) {console.log (err);} finally {await browser.close ();}}) ();

These are precisely some of the big sets of examples of test that can be created using Puppeteer. There are further possibilities, and we further you to search them.

The sample code “ test/github-headspinio.js ” contains an example to run the test on a HeadSpin browser.

Conclusion

Puppeteer is a potent instrument for testing web pages and automating browsers. It is an essential tool for developer and QA professionals. In this guide, we have let you know how to use Puppeteer for testing purposes. We have also listed some of the best practices for optimizing your tests with Puppeteer. By following the above-written best practices, you can optimise your tests and better the overall execution of your testing process.

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Thank you for reading this complete guidebook. We hope this guide has be extremely helpful to you.

Puppeteer Frequently Asked Question (FAQs)

Q1. Is Puppeteer free?

A:Yes, Puppeteer is free and unfastened source.

Q2. How do I use Puppeteer?

A:You can use Puppeteer by writing code in Node.js that uses the Puppeteer API.

Q3. What platforms do Puppeteer support?

A:Puppeteer support Linux, Windows, and macOS.

Q4. Does Puppeteer have a headless mode?

A:Yes, Puppeteer has a headless fashion.

Q5. What package do one need to instal to use Puppeteer?

A: All you need is Node.js and a text editor.

Q6. How do I update Puppeteer?

A:You can update Puppeteer by scarper the following dictation:

npm install puppeteer @ latest

Q: What language make Puppeteer use?

A:Puppeteer uses JavaScript.

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