Book Image

Mastering Selenium WebDriver 3.0 - Second Edition

By : Mark Collin
Book Image

Mastering Selenium WebDriver 3.0 - Second Edition

By: Mark Collin

Overview of this book

The second edition of Mastering Selenium 3.0 WebDriver starts by showing you how to build your own Selenium framework with Maven. You'll then look at how you can solve the difficult problems that you will undoubtedly come across as you start using Selenium in an enterprise environment and learn how to produce the right feedback when failing. Next, you’ll explore common exceptions that you will come across as you use Selenium, the root causes of these exceptions, and how to fix them. Along the way, you’ll use Advanced User Interactions APIs, running any JavaScript you need through Selenium; and learn how to quickly spin up a Selenium Grid using Docker containers. In the concluding chapters, you‘ll work through a series of scenarios that demonstrate how to extend Selenium to work with external libraries and applications so that you can be sure you are using the right tool for the job.
Table of Contents (15 chapters)

Visual validation

I've never been a strong proponent of visual validation (the practice of using code to check if something that you are looking at on screen is what should be displayed on screen). It’s something I have tried in the past and it never really seemed to live up to the hype. The idea of being able to take a screenshot of a site and then compare it to a known good copy sounds great, but the reality was always underwhelming.

In the past, I have diligently written code to take screenshots and then do a pixel-by-pixel comparison to see if they match. The problem was they very rarely did: variables such as different machines running at different resolutions came into play, slightly different rendering engines could result in color changes that were invisible to the human eye, but absolutely different to a computer. You then have to worry...