In this chapter, we looked at various techniques to understand the legacy code. Reading code is often an underrated skill. However, rather than reinventing the wheel, we need to judiciously reuse good working code whenever possible. In this chapter, and throughout the rest of the book, we emphasize the importance of writing test cases as an integral part of coding.

In the next chapter, we will talk about writing test cases and the often frustrating task of debugging that follows this.