[3.7] bpo-35424: test_multiprocessing: join 3 pools (GH-10986) by miss-islington · Pull Request #10987 · python/cpython

@vstinner @miss-islington

Join 3 pools in these tests:

* test.test_multiprocessing_spawn.WithProcessesTestPool.test_context
* test.test_multiprocessing_spawn.WithProcessesTestPool.test_traceback
(cherry picked from commit 388c8c2)

Co-authored-by: Victor Stinner <vstinner@redhat.com>

vstinner