As you already know, in the past couple of years, JavaScript has evolved dramatically. It was once a simple scripting language made for small web applications, but now it's the backbone for complex architectures, both in the server and the browser. However, this evolution has put developers in a situation where they need to manually manage a large code base that remained uncovered in terms of automated testing. While our fellow Java, .NET, or Ruby developers have been safely writing and running their tests, JavaScript developers remained in an uncharted territory, with the burden of figuring out how to properly test their applications. Lately, this void has been filled with the formation of new tools and testing frameworks written by the talented JavaScript community members. In this chapter, we'll cover some of these popular tools, but keep in mind that this field is very new and is constantly changing, so you'll also have to keep an eye out for newly emerging...