> You didn't respond to the idea of exposing both features separately
> after saying you didn't understand what I meant and saying that they
> were pointless and didn't make sense.  So I explained and also
> proposed a specific API to make the suggestion clearer and more
> concrete.

Well, suffice to say that I wasn't convinced at all. There are multiple
use cases for subtests in the Python test suite, but I can't think of
any for your proposed API separation. That's why I find it
uninteresting.

I'm making this proposal to solve a concrete issue, not in the interest
of minimalism. "Building block" was to be understood in that sense. Unit
testing is one of those areas where purity is a secondary concern.