TST: Test dimensions/indices found from parsed gufunc signatures. - #11178

I think for the testing purposes here it is perhaps better to just give back what the ufunc contains. I have been wondering more generally, though, about some way to expose this information -- maybe as simple as a nicer __repr__ -- and then I think it would be good to distinguish more clearly.

@mattip - are you happy with this going in separately? (I do apologize for hijacking your PR...)

for the testing purposes here it is perhaps better to just give back what the ufunc contains

Arguably the ufunc just contains a representation of nested tuple, split between num_dims and idx. So I'd maybe just return (core_enabled, tuple_of_idx).

I don't feel strongly about this - looks like a good thing to test however you spell it

LGTM, breaking the larger work into a number of smaller PRs is the way to go