"If you don't like unit testing your product, most likely your customers won't like to test it either."
—Anonymous
Enterprise applications follow the N-tier architecture model to handle numerous nonfunctional concerns such as upgradability, scalability, and maintainability. The best design approach is to decouple the tiers from each other; this allows scaling out a tier without affecting another tier, or refactoring code in one tier without affecting the other tiers. Usually, any web application contains three tiers: presentation, business logic, and a database tier. This chapter deals with unit testing the web tier or presentation layer. The next chapters cover the application and database layers.
The following topics will be covered in this chapter:
Unit testing a servlet controller in MVC
Understanding what to test in the presentation layer