For the *special-case* tests I'm looking at, the `bootstrap-*` testutil calls were pretty simple one-liner (or so) wrappers on top of calls to `tk/boot-services-with-config`.  Instead of creating new `testutils` helpers for these, I think I'll just have the tests call directly into `tk/boot-services-with-config` and not go through the `testutils` layer at all.  Seems a little better than polluting the namespace further with functions named like `*-returning-app-on-service-error`.