Technical requirements
You are encouraged to read Chapter 18, Testing Your Code with Unit Test Cases and TDD, before proceeding with this chapter.
This chapter requires Visual Studio 2019's free Community Edition or better, with all the database tools installed. Here, we will modify the code of Chapter 18, Testing Your Code with Unit Test Cases and TDD, which is available at https://github.com/PacktPublishing/Software-Architecture-with-C-9-and-.NET-5.