@support.requires_*_version broken for classes

[tiran]

BPO	41009
Nosy	@tiran, @ned-deily, @miss-islington
PRs	bpo-41009: fix requires_OS_version() class decorator #20942 [3.9] bpo-41009: fix requires_OS_version() class decorator (GH-20942) #20947 [3.8] bpo-41009: fix requires_OS_version() class decorator (GH-20942) #20948 [3.7] bpo-41009: fix requires_OS_version() class decorator (GH-20942) #20949

^{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 2020-06-25.12:19:30.263>
created_at = <Date 2020-06-17.15:20:43.909>
labels = ['3.8', '3.7', 'tests', '3.9', '3.10']
title = '@support.requires_*_version broken for classes'
updated_at = <Date 2020-06-25.12:19:30.263>
user = 'https://github.com/tiran'

bugs.python.org fields:

activity = <Date 2020-06-25.12:19:30.263>
actor = 'ned.deily'
assignee = 'none'
closed = True
closed_date = <Date 2020-06-25.12:19:30.263>
closer = 'ned.deily'
components = ['Tests']
creation = <Date 2020-06-17.15:20:43.909>
creator = 'christian.heimes'
dependencies = []
files = []
hgrepos = []
issue_num = 41009
keywords = ['patch']
message_count = 6.0
messages = ['371752', '371758', '371763', '372360', '372362', '372363']
nosy_count = 3.0
nosy_names = ['christian.heimes', 'ned.deily', 'miss-islington']
pr_nums = ['20942', '20947', '20948', '20949']
priority = 'high'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue41009'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9', 'Python 3.10']

[tiran]

The decorators requires_linux_version, requires_freebsd_version, and requires_mac_ver don't work as class decorators. Decorated classes are ignored completely and not used in tests. The problem affects a couple of tests in test_os and maybe more cases.

[tiran]

Clarification: By "ignored" I mean that the entire class is ignored and none of the tests in the class is executed. I ran into the issue when I was working on eventfd PR.

[miss-islington]

New changeset bb6ec14 by Christian Heimes in branch 'master':
bpo-41009: fix requires_OS_version() class decorator (GH-20942)
bb6ec14

[ned-deily]

New changeset d3798ed by Christian Heimes in branch '3.7':
[3.7] bpo-41009: fix requires_OS_version() class decorator (GH-20942) (GH-20949)
d3798ed

[miss-islington]

New changeset cd6f911 by Christian Heimes in branch '3.9':
[3.9] bpo-41009: fix requires_OS_version() class decorator (GH-20942) (GH-20947)
cd6f911

[miss-islington]

New changeset 8075fe1 by Christian Heimes in branch '3.8':
[3.8] bpo-41009: fix requires_OS_version() class decorator (GH-20942) (GH-20948)
8075fe1