Book Image

UI Testing with Puppeteer

By : Dario Kondratiuk
Book Image

UI Testing with Puppeteer

By: Dario Kondratiuk

Overview of this book

Puppeteer is an open source web automation library created by Google to perform tasks such as end-to-end testing, performance monitoring, and task automation with ease. Using real-world use cases, this book will take you on a pragmatic journey, helping you to learn Puppeteer and implement best practices to take your automation code to the next level! Starting with an introduction to headless browsers, this book will take you through the foundations of browser automation, showing you how far you can get using Puppeteer to automate Google Chrome and Mozilla Firefox. You’ll then learn the basics of end-to-end testing and understand how to create reliable tests. You’ll also get to grips with finding elements using CSS selectors and XPath expressions. As you progress through the chapters, the focus shifts to more advanced browser automation topics such as executing JavaScript code inside the browser. You’ll learn various use cases of Puppeteer, such as mobile devices or network speed testing, gauging your site’s performance, and using Puppeteer as a web scraping tool. By the end of this UI testing book, you’ll have learned how to make the most of Puppeteer’s API and be able to apply it in your real-world projects.
Table of Contents (12 chapters)

Summary

If you get to apply performance tests in your team, you will be on a whole new level.

We started the chapter by talking about Lighthouse. We only covered the Performance category. But now that you know how it works, I encourage you to keep digging into the other categories and think about how to create tests for that. I would love to see more tests about accessibility.

We also learned how to use Lighthouse in our tests. That's not something you will see quite often. You will be able to test very complex metrics using two lines of code.

Most developers would run away from Puppeteer's tracing results. Although what you can get from there is way more than what we covered, we learned the foundations of such a powerful tool in this chapter.

The size of a page is critical for performance; that's why we learned about code coverage and how to measure it.

And this is also a wrap on this book. When I planned this book, my goal was to write a book that would...