Use uglier but way more standard test location.

I'd much rather separate them into their own files, but I'm starting to
think that tends to cause some problems. Now I'm wondering how one
`RootSuite`'s context of execution may reach the others... I could use a
global suite, but I'd still not know when to trigger a build (supposing
I wanted to make a parallel build). Nor would I know when to stop it and
where to propagate the errors to.