It's true that our tests are currently passing, but that doesn't mean the code is perfect. Not by a long stretch. Consider the fact that one of the core abilities of this application is to track stock. And, yet, if we browse the source code, is there a single point of entry we could visit to learn exactly what happens when this tracking takes place? The answer is unfortunately, "not really." What if we could change that by creating a TrackStock use case class that describes the important steps.
View the source code for this episode on GitHub.