This chapter is a starting point to learn about how Knockout.JS works. It gives the overall understanding of the Model-View-ViewModel presentation pattern and the most important technical details of this library.

If you look at the big picture, it's easier to see how these techniques foster better web application testing. It's virtually impossible to adequately test a web application without a proper application design. In this respect, you have learned how Knockout.JS promotes a real separation of responsibilities between the View and ViewModel.

In the next chapter, we will dig into a well-known JavaScript unit testing framework. Then, we will put all together to understand how we can take advantage of Knockout.JS in a web application testing strategy.