If you’ve made it this far, you may find that your team and customer base have grown to a point that you are swamped with feature requests and a more complicated product. This is a good problem to have! It means that not only are you are writing new features for customers, but you have a large enough team to explore how to configure your system to experiment with your customers’ experience.
To do this, in chapter 8, we will look at configuring our application to change without changing its code. We will use this configuration to help us focus on writing tests based on feature requests running against an entire system instead of the modular pieces of code in chapter 9. Then we’ll move our application to a larger production ecosystem in chapter 10 using containers. Chapter 11 is a summary of all you have learned.