Running `meteor test` with tests.js files included in packages?

Does anybody have a recipe or pattern for running meteor test across packages? The Feb updates to dispatch:mocha finally resulted in a workable configuration to use meteor test on Circle CI. So we can finally migrate off Gagarin.

But right now, we still need to create a scaffold app and copy files over when running on Circle.

Also, we can’t really test more than one package at a time. With Gagarin, we could use wildcards like so: gagarin ./**/tests/**/*.js

What would be really great is to be able to include *.test.js files in packages; and then pick them up with meteor test.