Make `test_zoneinfo.py` to check all pickle protocols

[sobolevn]

BPO	45577
Nosy	@ambv, @miss-islington, @sobolevn
PRs	bpo-45577: test all pickle protocols in test_zoneinfo #29167 [3.9] bpo-45577: test all pickle protocols in test_zoneinfo (GH-29167) #29295 [3.10] bpo-45577: test all pickle protocols in test_zoneinfo (GH-29167) #29296

^{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 2021-10-29.20:34:49.392>
created_at = <Date 2021-10-22.16:42:30.624>
labels = ['type-bug', 'tests', '3.9', '3.10', '3.11']
title = 'Make `test_zoneinfo.py` to check all pickle protocols'
updated_at = <Date 2021-10-29.20:34:49.391>
user = 'https://github.com/sobolevn'

bugs.python.org fields:

activity = <Date 2021-10-29.20:34:49.391>
actor = 'lukasz.langa'
assignee = 'none'
closed = True
closed_date = <Date 2021-10-29.20:34:49.392>
closer = 'lukasz.langa'
components = ['Tests']
creation = <Date 2021-10-22.16:42:30.624>
creator = 'sobolevn'
dependencies = []
files = []
hgrepos = []
issue_num = 45577
keywords = ['patch']
message_count = 5.0
messages = ['404793', '405261', '405280', '405281', '405337']
nosy_count = 3.0
nosy_names = ['lukasz.langa', 'miss-islington', 'sobolevn']
pr_nums = ['29167', '29295', '29296']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue45577'
versions = ['Python 3.9', 'Python 3.10', 'Python 3.11']

[sobolevn]

Right now it only uses a default one.

Examples:

• 3.9:

  cpython/Lib/test/test_zoneinfo/test_zoneinfo.py

  Line 1407 in aa8c344

  pkl = pickle.dumps(zi_in)

• 3.10:

  cpython/Lib/test/test_zoneinfo/test_zoneinfo.py

  Line 1407 in ae78ffd

  pkl = pickle.dumps(zi_in)

• main:

  cpython/Lib/test/test_zoneinfo/test_zoneinfo.py

  Line 1405 in ec93721

  def test_cache_hit(self):

PR is on its way!

[ambv]

New changeset 66e6b3d by Nikita Sobolev in branch 'main':
bpo-45577: test all pickle protocols in test_zoneinfo (GH-29167)
66e6b3d

[ambv]

New changeset dd674ca by Miss Islington (bot) in branch '3.9':
bpo-45577: test all pickle protocols in test_zoneinfo (GH-29167) (GH-29295)
dd674ca

[ambv]

New changeset 7203ecd by Miss Islington (bot) in branch '3.10':
bpo-45577: test all pickle protocols in test_zoneinfo (GH-29167) (GH-29296)
7203ecd

[ambv]

Thanks, Nikita! ✨ 🍰 ✨