Generator tests is broken in non-CPython implementation

[isaiah]

BPO	32384
Nosy	@berkerpeksag, @1st1, @isaiah
PRs	bpo-32384 fix test.test_generators for other implementations #4940 bpo-32384: skip the test unless an import succeeds #5005 [3.7] bpo-32384: Skip test when _testcapi isn't available (GH-4940) #6891 [3.6] bpo-32384: Skip test when _testcapi isn't available (GH-4940) #6892

^{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 2018-05-16.09:18:06.287>
created_at = <Date 2017-12-20.10:50:40.604>
labels = ['3.7', '3.8', 'type-bug', 'tests']
title = 'Generator tests is broken in non-CPython implementation'
updated_at = <Date 2018-05-16.09:18:06.286>
user = 'https://github.com/isaiah'

bugs.python.org fields:

activity = <Date 2018-05-16.09:18:06.286>
actor = 'berker.peksag'
assignee = 'none'
closed = True
closed_date = <Date 2018-05-16.09:18:06.287>
closer = 'berker.peksag'
components = ['Tests']
creation = <Date 2017-12-20.10:50:40.604>
creator = 'isaiahp'
dependencies = []
files = []
hgrepos = []
issue_num = 32384
keywords = ['patch']
message_count = 5.0
messages = ['308717', '316780', '316787', '316791', '316792']
nosy_count = 3.0
nosy_names = ['berker.peksag', 'yselivanov', 'isaiahp']
pr_nums = ['4940', '5005', '6891', '6892']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue32384'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[isaiah]

The fix for bpo-30039 introduced a regression test in test.test_generators which uses _testcapi module, it doesn't check ImportError and so breaks on other implementations.

[berkerpeksag]

New changeset 4cc3eb4 by Berker Peksag (Isaiah Peng) in branch 'master':
bpo-32384: Skip test when _testcapi isn't available (GH-4940)
4cc3eb4

[berkerpeksag]

New changeset 4af6110 by Berker Peksag (Miss Islington (bot)) in branch '3.7':
bpo-32384: Skip test when _testcapi isn't available (GH-4940)
4af6110

[berkerpeksag]

New changeset 5e8c526 by Berker Peksag (Miss Islington (bot)) in branch '3.6':
bpo-32384: Skip test when _testcapi isn't available (GH-4940)
5e8c526

[berkerpeksag]

Thanks!