Thanks for the comments.

For scientific software I think there's value to being able to refer to test results and examine them in detail because often, they're not "pass or fail" tests; they return real or complex numbers that mean something in the context of the software being installed.

Simply using `system` logs the results in `~/Library/Logs/Homebrew`. I thought this made sense: results are logged in the same place as all config/make output.

But I'd like to hear opinion on best practices for such tests.