I was working on a configuration loader library last night and came across a problem when testing where I needed to see the logs printed by the function being tested. Here's how I did it.
https://dev.to/keystroke3/how-to-read-a-functions-stdout-logs-in-go-tests-22d6

TIL #golang allows for named function return values. If the value is not explicitly set, then the nil version of its type will be returned. This is very useful for failed validations that return nil non-error values.