test_multiprocessing: @requires_hashdigest() prevents test discovery

[tiran]

BPO	42389
Nosy	@vstinner, @tiran, @serhiy-storchaka
Superseder	bpo-45042: Many multiprocessing tests are silently skipped since 3.9

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2021-09-17.20:14:25.140>
created_at = <Date 2020-11-17.15:16:09.038>
labels = ['3.8', 'type-bug', 'tests', '3.9', '3.10']
title = 'test_multiprocessing: @requires_hashdigest() prevents test discovery'
updated_at = <Date 2021-09-17.20:14:25.139>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2021-09-17.20:14:25.139>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2021-09-17.20:14:25.140>
closer = 'serhiy.storchaka'
components = ['Tests']
creation = <Date 2020-11-17.15:16:09.038>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 42389
keywords = []
message_count = 2.0
messages = ['381245', '402086']
nosy_count = 3.0
nosy_names = ['vstinner', 'christian.heimes', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '45042'
type = 'behavior'
url = 'https://bugs.python.org/issue42389'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[tiran]

The helper function "install_tests_in_module_dict" uses subclass checks to detect test cases in module globals:

    if issubclass(base, BaseTestCase):
        ...
    elif issubclass(base, unittest.TestCase):
        ...

However @requires_hashdigest() returns a function object, not a class instance. None of the tests marked with @requires_hashdigest() are executed any more.

[serhiy-storchaka]

Fixed in bpo-45042.