Deprecate obsolete functions in unittest

[voidspace]

BPO	5846
Nosy	@birkenfeld, @ezio-melotti, @voidspace, @ambv, @serhiy-storchaka, @erlend-aasland
PRs	bpo-5846: Deprecate obsolete methods makeSuite, findTestCases, and getTestCaseNames in unittest #20400 bpo-5846: Deprecate obsolete methods in unittest #28299 bpo-5846: Do not use obsolete unittest functions. #28303 bpo-5846: Fix deprecations for obsolete unittest functions and add tests. #28382

^{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 = 'https://github.com/voidspace'
closed_at = <Date 2021-09-17.09:11:48.612>
created_at = <Date 2009-04-25.23:44:59.267>
labels = ['type-feature', 'library', '3.11']
title = 'Deprecate obsolete functions in unittest'
updated_at = <Date 2021-09-18.12:12:58.564>
user = 'https://github.com/voidspace'

bugs.python.org fields:

activity = <Date 2021-09-18.12:12:58.564>
actor = 'erlendaasland'
assignee = 'michael.foord'
closed = True
closed_date = <Date 2021-09-17.09:11:48.612>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2009-04-25.23:44:59.267>
creator = 'michael.foord'
dependencies = []
files = []
hgrepos = []
issue_num = 5846
keywords = ['patch']
message_count = 13.0
messages = ['86574', '86687', '87298', '87361', '87592', '386705', '401691', '401878', '401899', '402014', '402016', '402042', '402126']
nosy_count = 6.0
nosy_names = ['georg.brandl', 'ezio.melotti', 'michael.foord', 'lukasz.langa', 'serhiy.storchaka', 'erlendaasland']
pr_nums = ['20400', '28299', '28303', '28382']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue5846'
versions = ['Python 3.11']

[voidspace]

_makeLoader, getTestCaseNames, makeSuite and findTestCases have all had
the comment "these functions should be considered obsolete" for a long time.

Is is ok to go straight to deprecation or should they be marked with
PendingDeprecationWarning first?

[birkenfeld]

I guess adding a standard DeprecationWarning is fine in these cases.

[voidspace]

So it turns out that unittest.makeSuite is used about 100 times
throughout the standard library tests.

More than half the time it can be replaced with
unittest.TestLoader().loadTestsFromTestCase(...)

Some of the other times a loader needs to be constructed and then a
testMethodPrefix of 'Check' set (yuck!).

I'm about halfway through a patch that does this. Think it is worth
continuing or shall I drop it. I don't mind doing it so long as
*someone* thinks it is worthwhile... :-)

(I haven't yet checked for getTestCaseNames but I imagine there will be
a bunch of these to fix as well.)

Another possibility is to move the functions into test_support
(deprecating first) where at least they are out of unittest.

[birkenfeld]

I'm sure Gerhard wouldn't say no to changing the sqlite3 test prefix to
"test_"...

[voidspace]

Hehe - I wasn't actually doing that, just replacing the use of the
obsolete functions.

[erlend-aasland]

I'm sure Gerhard wouldn't say no to changing the sqlite3 test prefix to
"test_"...

FYI, the sqlite3 tests have now been cleaned up (GH-20538).

Remaining occurrences in Lib/test:
Lib/test/test_pdb.py: unittest.makeSuite(PdbTestCase),
Lib/test/test_dbm.py: suites = [unittest.makeSuite(c) for c in classes]
Lib/test/test_io.py: suite = unittest.TestSuite([unittest.makeSuite(test) for test in tests])
Lib/test/test_threading_local.py: suite.addTest(unittest.makeSuite(ThreadLocalTest))
Lib/test/test_threading_local.py: suite.addTest(unittest.makeSuite(PyThreadingLocalTest))
Lib/test/test_zipimport.py: # item in a list sorted by name, like unittest.makeSuite() does.)
Lib/test/support/init.py: suite.addTest(unittest.findTestCases(sys.modules[cls]))
Lib/test/support/init.py: suite.addTest(unittest.makeSuite(cls))
Lib/test/support/testresult.py: suite.addTest(unittest.makeSuite(TestTests))
Lib/test/test_email/torture_test.py: suite.addTest(unittest.makeSuite(testclass))
Lib/test/test_math.py: suite.addTest(unittest.makeSuite(MathTests))
Lib/test/test_math.py: suite.addTest(unittest.makeSuite(IsCloseTests))

[serhiy-storchaka]

New changeset 851811f by Serhiy Storchaka in branch 'main':
bpo-5846: Do not use obsolete unittest functions. (GH-28303)
851811f

[ambv]

New changeset ff6d2cc by Erlend Egeberg Aasland in branch 'main':
bpo-5846: Deprecate obsolete methods in unittest (GH-28299)
ff6d2cc

[serhiy-storchaka]

I do not think that PR 28299 is correct. We want to deprecate these functions which are implemented in the unittest.loader module, not just names exported to the unittest module.

[serhiy-storchaka]

New changeset b2b035a by Serhiy Storchaka in branch 'main':
bpo-5846: Fix deprecations for obsolete unittest functions and add tests. (GH-28382)
b2b035a