@jeko I moved test-runner and related utilities to Ares:
https://git.sr.ht/~abcdw/guile-ares-rs/tree/master/item/src/guile/ares/srfi-64/test-runners.scm

Plan to rework it a bit and provide an Emacs interface through Arei in foreseable future.

Maybe will later move test-runner to a separate library, when we make a good guile package manager.