One of the biggest skills you can learn to improve in your code is by learning how to test it. Adding unit tests to your code with the XCTest Testing framework will help you improve the quality of your code and will provide a secondary benefit of documenting how your code works. As you move from solo developer projects to multi-member teams, it becomes harder to maintain tests that are written in isolation. Automated testing, added to a continuous integration pipeline on a server, helps to address these pain points in the same way that source repositories help to manage code over larger projects.
In the first part of this chapter, we will cover Xcode Server's capabilities as a continuous integration server and how automated testing can be included to improve your testing workflow. In the second half, we will describe how to use LLDB for debugging your code on Linux.