In this chapter, we have discussed the basic TDD methodology and provided more information on how to efficiently write meaningful automated tests for your software. We have reviewed a few ways of structuring and discovering tests. We have also mentioned popular testing tools that make writing tests fun and easy.
We have mentioned that tests can be used not only to verify application validity but also to assert some claims about its performance. This is a good starting point for the next two chapters, where we will discuss how to diagnose various performance issues of the Python application and also learn some powerful optimization principles and techniques.