[3.8] bpo-37667: Add regression test for regrtest. (GH-14929) by miss-islington · Pull Request #14931 · python/cpython

@gpshead @miss-islington

Verify that it appears to find roughly the right number of tests in the stdlib's testsuite.
(cherry picked from commit e95ac20)

Co-authored-by: Gregory P. Smith <greg@krypto.org>