Book Image

Selenium WebDriver Quick Start Guide

By : Pinakin Chaubal
Book Image

Selenium WebDriver Quick Start Guide

By: Pinakin Chaubal

Overview of this book

Selenium WebDriver is a platform-independent API for automating the testing of both browser and mobile applications. It is also a core technology in many other browser automation tools, APIs, and frameworks. This book will guide you through the WebDriver APIs that are used in automation tests. Chapter by chapter, we will construct the building blocks of a page object model framework as you learn about the required Java and Selenium methods and terminology. The book starts with an introduction to the same-origin policy, cross-site scripting dangers, and the Document Object Model (DOM). Moving ahead, we'll learn about XPath, which allows us to select items on a page, and how to design a customized XPath. After that, we will be creating singleton patterns and drivers. Then you will learn about synchronization and handling pop-up windows. You will see how to create a factory for browsers and understand command design patterns applicable to this area. At the end of the book, we tie all this together by creating a framework and implementing multi-browser testing with Selenium Grid.
Table of Contents (10 chapters)

Introducing the command design pattern

The command design pattern is a behavioral design pattern that involves four players, as in the following example:

  • Client
  • Invoker
  • Command
  • Receiver

In very simple words, the receiver is the object on screen such as a textbox and button and the command is sendKeys and click. We encapsulate the command in an object and pass it to the receiver.

The actual command design pattern also supports an Undo operation, but we will not consider the Undo operation here. By using command objects, it becomes easier to build generic components that need to assign, delegate, or execute method calls without needing to know the class of the method or the method parameters. Using an invoker object allows command executions to be conveniently performed. Using this, we can also create different modes for commands that are handled by the invoker object without...