In the previous chapter, you learned how to write unit tests and saw an easy example of TDD. When starting TDD, writing unit tests is easy for most people. The hard part is to transfer knowledge from writing test to driving development. What can be assumed? What should be done before one writes the first test? What should be tested to end up with a complete app?
As a developer, you are used to thinking in terms of code. When you see a feature on the requirement list for an app, your brain already starts to layout the code for this feature. For recurring problems in iOS development (such as building table views), you most probably have already developed your own best practices.
In TDD, you should not think about the code while working on the test. The tests have to describe what the unit under test should do and not how it should...