Chapter 7: Building a Table View Controller for the To-Do Items

If you have talked to other iOS developers about unit testing and the test-driven development of iOS apps, you might have heard the opinion that the user interface of iOS apps is not testable and also shouldn't be tested. Many developers state that it is enough to check whether the user interface is correct by running the app during development and testing it manually.

That might be true for the initial implementation of the user interface. During the development process, you run the app often on the iOS simulator or on your test devices and most bugs and errors in the user interface are quite obvious.

However, the main benefit of a user interface that is backed by unit tests is the ability to fearlessly refactor code that is no longer perfect. As a developer, you gain experience every day, and each year, Apple releases new APIs that make our code easier to understand and sometimes easier to write. Long-living...