Test-Driven Java Development, Second Edition - Second Edition

Different specifications

We have already mentioned that one of the benefits of TDD is executable documentation that is always up to date. However, documentation obtained through unit tests is often not enough. When working at such a low-level, we get insights into details; however, it is all too easy to miss the big picture. If, for example, you were to inspect specifications that we created for the Tic-Tac-Toe game, you might easily miss the point of the application. You would understand what each unit does and how it interoperates with other units, but would have a hard time grasping the idea behind it. To be precise, you would understand that unit X does Y and communicates with Z; however, the functional documentation and the idea behind ...