[issue45229] Always use unittest for collecting tests in regrtests

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Seems this is not a new bug:

$ ./python -m test test_datetime test_datetime -m test_divide_and_round
0:00:00 load avg: 2.36 Run tests sequentially
0:00:00 load avg: 2.36 [1/2] test_datetime
0:00:00 load avg: 2.36 [2/2] test_datetime
test test_datetime failed -- Traceback (most recent call last):
  File "/home/serhiy/py/cpython3.9/Lib/test/datetimetester.py", line 88, in test_divide_and_round
    dar = datetime_module._divide_and_round
AttributeError: module 'datetime' has no attribute '_divide_and_round'

test_datetime failed (1 error)

== Tests result: FAILURE ==


But for some causes it was not reproduced with refleak tests.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45229>
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