👨‍💼 Great! Did you notice the issue? In that last test, you've got an error log:

stderr | app/utils/misc.error-message.test.ts > undefined falls back to Unknown
Unable to get error message for error undefined

This is useful during debugging, but very annoying when running the tests. We want to keep our logs as clean as possible to make it easier to spot real issues. In fact, the log is an important part of the functionality of our util, so we should probably assert that it's being called.

So it's time for us to learn about spying... 🕵️‍♀️