How I Read Rails Source Code

Worth bookmarking just for the bundle open gem tip. But also full of other little bits of wisdom.

The obvious benefit of a test is to make sure that the code still works after making a change. However, another hidden benefit is that a test can help us get familiar with the codebase quickly. You can execute the code without launching the application in the browser or running the complete program.

This is an underrated upside of having lots of unit tests and it’s an onboarding hack I use a lot myself for learning new codebases quickly.