gh-93096: fix test_mimetypes.test_guess_type_conflicting_with_mimetypes

[picnixz]

Using run_python_until_end() ignores setUpModule(). In particular, mocking mimetypes.knownfiles has no effect for the CLI tests and leads to issues on platforms defining non-standard MIME types such as macOS or openSUSE.

I think this was overlooked in #93097 and this may be the reason why finding the correct extension was tedious. Now, all platforms should support the test correctly (previously, the macOS files were still looked up as mimetypes.knownfiles was not unset for CLI tests).

• Issue: Decide the fate of undocumented script behavior of some modules #93096

[picnixz]

!buildbot macOS

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @picnixz for commit 62863a0 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F131408%2Fmerge

The command will test the builders whose names match following regular expression: macOS

The builders matched are:

• x86-64 MacOS Intel NoGIL PR
• x86-64 macOS PR
• ARM64 MacOS M1 NoGIL PR
• x86-64 MacOS Intel ASAN NoGIL PR
• ARM64 MacOS M1 Refleaks NoGIL PR
• ARM64 macOS PR

[picnixz]

!buildbot macOS

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @picnixz for commit 7be23f0 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F131408%2Fmerge

The command will test the builders whose names match following regular expression: macOS

The builders matched are:

• x86-64 MacOS Intel NoGIL PR
• x86-64 macOS PR
• ARM64 MacOS M1 NoGIL PR
• x86-64 MacOS Intel ASAN NoGIL PR
• ARM64 MacOS M1 Refleaks NoGIL PR
• ARM64 macOS PR

[picnixz]

@hugovk friendly ping (I hope we can ship it before the release as it could affect openSUSE users)

[AA-Turner]

An alternative solution to sys.exit() with a string or the esoteric parser.exit() would just be to directly raise SystemExit, would this work?:

[picnixz]

Mmh the CI seems to hang?

[hugovk]

Thank you!

[picnixz]

Ah I wanted to write the commit message :') but you beat me to it

[picnixz]

Hum:

FAIL: test_invocation_error (test.test_mimetypes.CommandLineTest.test_invocation_error)
----------------------------------------------------------------------
Traceback (most recent call last):
File "/Users/buildbot/Library/Developer/XCTestDevices/D0521D50-377E-44CF-8CFA-3BC0FF6BF873/data/Containers/Bundle/Application/F1096A52-2582-4077-A71C-A6AFE9D885CD/iOSTestbed.app/python/lib/python3.14/test/test_mimetypes.py", line 435, in test_invocation_error
with self.assertRaisesRegex(SystemExit, expected):
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
AssertionError: SystemExit not raised

This is on iOS ARM64. Let's just skip this one on this maybe.