gh-141174: Improve annotationlib.get_annotations() test coverage

[dr-carlos]

All lines in get_annotations(), _rewrite_star_unpack(), and _get_and_call_annotate() should now be covered by tests.

Branch coverage for evaluating stringized annotations on classes with no module or a module which cannot be imported was intentionally not included, as I couldn't find a realistic case and it didn't seem like a behaviour that needed to be reproducible. Happy to add a new test for this.

Also happy to remove the test which covers the branch of 'what if we unwrap a partial object but functools has never been imported', as this isn't a very realistic situation either.

• Issue: annotationlib: Improve test coverage #141174

[miss-islington-app]

Thanks @dr-carlos for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖

[bedevere-app]

GH-141353 is a backport of this pull request to the 3.14 branch.

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot ARM64 macOS 3.x (tier-2) has failed when building commit 06b6228.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/725/builds/12289) and take a look at the build logs.
4. Check if the failure is related to this commit (06b6228) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/725/builds/12289

Failed tests:

• test_urllib2net

Summary of the results of the build (if available):

==

Click to see traceback logs

remote: Enumerating objects: 9, done.        
remote: Counting objects:  11% (1/9)        
remote: Counting objects:  22% (2/9)        
remote: Counting objects:  33% (3/9)        
remote: Counting objects:  44% (4/9)        
remote: Counting objects:  55% (5/9)        
remote: Counting objects:  66% (6/9)        
remote: Counting objects:  77% (7/9)        
remote: Counting objects:  88% (8/9)        
remote: Counting objects: 100% (9/9)        
remote: Counting objects: 100% (9/9), done.        
remote: Compressing objects:  20% (1/5)        
remote: Compressing objects:  40% (2/5)        
remote: Compressing objects:  60% (3/5)        
remote: Compressing objects:  80% (4/5)        
remote: Compressing objects: 100% (5/5)        
remote: Compressing objects: 100% (5/5), done.        
remote: Total 5 (delta 4), reused 0 (delta 0), pack-reused 0 (from 0)        
From https://github.com/python/cpython
 * branch                    main       -> FETCH_HEAD
Note: switching to '06b62282c79dd69293a3eefb4c55f5acc6312cb2'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by switching back to a branch.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -c with the switch command. Example:

  git switch -c <new-branch-name>

Or undo this operation with:

  git switch -

Turn off this advice by setting config variable advice.detachedHead to false

HEAD is now at 06b62282c79 gh-141174: Improve `annotationlib.get_annotations()` test coverage (#141286)
Switched to and reset branch 'main'

make: *** [buildbottest] Error 2

[dr-carlos]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot ARM64 macOS 3.x (tier-2) has failed when building commit 06b6228.

This seems to be a false positive - obviously this commit doesn't touch test_urllib2net, and the issue is an FTP timeout.

[JelleZijlstra]

Petr said that that test is being disabled on buildbots, it's frequently flaky.