$ watch make test &  3794 ✔ bifs.components ✔ bifs.dark ✔ bifs.darken ✔ bifs.image-size ...
use a Makefile. With the large quantity of copy-cats (Rake,Jake,Sake,Cake…) people seem to be forgetting that Make is awesome, if you take a little bit of time to learn it you’ll love it (or at least most of it). Make will utilize
mtimeand only build what’s necessary, this is great.
Check the project source for more info and usage.