Rewrite test_dbm

[serhiy-storchaka]

BPO	45500
Nosy	@ambv, @serhiy-storchaka, @corona10
PRs	bpo-45500: Rewrite test_dbm #29002 [3.10] bpo-45500: Rewrite test_dbm (GH-29002) #29069 [3.9] bpo-45500: Rewrite test_dbm (GH-29002) #29074

^{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 2021-10-20.08:29:13.961>
created_at = <Date 2021-10-17.09:55:33.220>
labels = ['type-feature', 'tests', '3.9', '3.10', '3.11']
title = 'Rewrite test_dbm'
updated_at = <Date 2021-10-20.08:29:13.960>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2021-10-20.08:29:13.960>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2021-10-20.08:29:13.961>
closer = 'serhiy.storchaka'
components = ['Tests']
creation = <Date 2021-10-17.09:55:33.220>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 45500
keywords = ['patch']
message_count = 5.0
messages = ['404131', '404336', '404346', '404399', '404401']
nosy_count = 3.0
nosy_names = ['lukasz.langa', 'serhiy.storchaka', 'corona10']
pr_nums = ['29002', '29069', '29074']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue45500'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[serhiy-storchaka]

• Generate test classes at import time. It allows to filter them when run with unittest. E.g: "./python -m unittest test.test_dbm.TestCase_gnu -v".
• Create a database class in a new directory which will be removed after test. It guarantees that all created files and directories be removed and will not conflict with other dbm tests.
• Restore dbm._defaultmod after tests. Previously it was set to the last dbm module (dbm.dumb) which affected other tests.
• Enable the whichdb test for dbm.dumb.
• Move test_keys to the correct test class. It does not test whichdb().
• Remove some outdated code and comments.

[ambv]

New changeset 975b94b by Serhiy Storchaka in branch 'main':
bpo-45500: Rewrite test_dbm (GH-29002)
975b94b

[ambv]

New changeset 325b2c2 by Łukasz Langa in branch '3.10':
[3.10] bpo-45500: Rewrite test_dbm (GH-29002) (GH-29069)
325b2c2

[corona10]

New changeset d46b221 by Łukasz Langa in branch '3.9':
[3.9] bpo-45500: Rewrite test_dbm (GH-29002) (GH-29074)
d46b221

[serhiy-storchaka]

Thanks Łukasz and Dong-hee Na.