Tested manually:

./python.exe -m test -m test_gc
....
Total duration: 1 min 55 sec
Tests result: SUCCESS

One more way to test this. Below passes with PR but fails on master as per https://bugs.python.org/issue36155#msg336903

./python.exe -m unittest unittest.test.testmock test.test_gc
.................................................................................................................................................................s..................................................................................................................................................................................................................................................
----------------------------------------------------------------------
Ran 404 tests in 8.209s

OK (skipped=1)

One more way to test this. Below passes with PR but fails on master as per https://bugs.python.org/issue36155#msg336903

./python.exe -m unittest unittest.test.testmock test.test_gc
.................................................................................................................................................................s..................................................................................................................................................................................................................................................
----------------------------------------------------------------------
Ran 404 tests in 8.209s

OK (skipped=1)

This is the one I was using:

./python.exe -m test  test_asyncio test_gc -m test_gc  -v

until I found the real cause of the problem (the unnitest.mock._ANY). ;)

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