[pokstad]

No, tests are commonly in the same package as the implementation.

I did find this one: https://github.com/tenta-browser/tenta-dns/blob/master/src/t...

That's an internal test, meaning it has access to the package internals. A better test would test from outside the boundaries of the package to only interact with exposed symbols.

[alpb]

Oh lordy, that log.SetLogLevel() has effects outside the test code.

[tenta]

Setting the log level has effects, but only on an internal wrapper package that neatly zips up the nitty gritty of setting up the logger.

[sagichmal]

Package-level loggers are an antipattern :(