I just got done doing the same thing... here is what I did:
1) I created a Schema and a Collection using that schema.
2) I wrote tests against the Collection using Mocha instead of Jest (Mocha is used more for integration tests in Reaction; Jest for unit tests)
3) I ran the tests using the
npm run test:app:watch
), but used
) to limit the tests that are run
I copied my plugin code to a small repo, if you'd like to take a look: https://github.com/Brewline/reaction-watchlist