Fix test_shelve and make it discoverable

[serhiy-storchaka]

BPO	45502
Nosy	@ambv, @serhiy-storchaka
PRs	bpo-45502: Fix test_shelve #29003 [3.10] bpo-45502: Fix test_shelve (GH-29003) #29305 [3.9] [3.10] bpo-45502: Fix test_shelve (GH-29003) (GH-29305) #29306

^{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 2021-10-29.10:19:07.765>
created_at = <Date 2021-10-17.10:15:57.401>
labels = ['type-bug', 'tests', '3.9', '3.10', '3.11']
title = 'Fix test_shelve and make it discoverable'
updated_at = <Date 2021-10-29.10:19:07.765>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2021-10-29.10:19:07.765>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2021-10-29.10:19:07.765>
closer = 'serhiy.storchaka'
components = ['Tests']
creation = <Date 2021-10-17.10:15:57.401>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 45502
keywords = ['patch']
message_count = 5.0
messages = ['404133', '404134', '404772', '405295', '405300']
nosy_count = 2.0
nosy_names = ['lukasz.langa', 'serhiy.storchaka']
pr_nums = ['29003', '29305', '29306']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue45502'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[serhiy-storchaka]

test_shelve was intended to run some tests for all underlying dbm implementation, but since b17acad (at May 2008) it runs them with the same implementation.

The proposed PR fixes this regression and also makes test_shelve discoverable, so it can be run with the unittest module.

[serhiy-storchaka]

Also it was only tested with pickle protocols 0, 1 and 2. Now it will be tested with all pickle protocols.

[ambv]

New changeset b781cc3 by Serhiy Storchaka in branch 'main':
bpo-45502: Fix test_shelve (GH-29003)
b781cc3

[serhiy-storchaka]

New changeset 6b86702 by Serhiy Storchaka in branch '3.10':
[3.10] bpo-45502: Fix test_shelve (GH-29003) (GH-29305)
6b86702

[serhiy-storchaka]

New changeset a043706 by Serhiy Storchaka in branch '3.9':
[3.9] [3.10] bpo-45502: Fix test_shelve (GH-29003) (GH-29305) (GH-29306)
a043706