Most of our projects are mysql, and in those we don't use any db-specific features. Those all use in-memory sqlite for tests. Only in one of our projects do we use jsonb with postgres, that one does use postgres for the tests as well. Though, that project probably didn't need it - we're just sort of stuffing semi-regular data from another system into it. It would have worked just as well as a text field that was parsed as-needed, since as far as I remember we don't query it directly, only query based on other columns in that table.