In this chapter, we learned about the process of building from a foundation of unit tests into a set of tests that cover the whole system.

Specifically, we covered how to draw an integration diagram. We learned how to interpret an integration diagram to decide in what order to build the tests and also learned which tools to use and how to use them to write the integration tests.

Now that we've learned about integration testing, we're ready to introduce a number of other useful testing tools and strategies, which is the topic of the next chapter.