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I was indeed just asking where to put it, and how to
*insert* the test.  Anyway, I found that most of what was
needed for the test was already in
test_descr.classmethods(), there were just a few conditions
using super() that needed adding.  I've uploaded the patch
for test_descr to the patch #537536 for this bug.

By the way, the bug/patch submission guidelines were a
little unclear to me; specifically whether I was supposed to
put the patch with the bug or the bug with the patch or
upload everything to both or what.  Hope my ignorance hasn't
inconvenienced anyone; this is my first time submitting
Python bugs and fixes.  Also, I hadn't worked with the test
framework used in Python's test suite before, although I've
done quite a bit with unittest in my own code.