Go tip of the day : running tests for all subpackages recursively

If you program in Go, you've probably written a lot of packages, and probably split packages in subpackages. Maybe even more than idiomatic Go would really advise... And you may have been grumbling just like I did at the fact that the go test command requires a list of packages, and does not recursively dive into all the subpackages, like PHPunit would, and does not seem to have a working recursion flag.