[autobackport: sssd-2-12] tests: fixing mypy linting errors

[sssd-bot]

This is an automatic backport of PR#8762 tests: fixing mypy linting errors to branch sssd-2-12, created by @danlavu.

Please make sure this backport is correct.

Note

The commits were cherry-picked without conflicts.

You can push changes to this pull request

git remote add sssd-bot git@github.com:sssd-bot/sssd.git
git fetch sssd-bot refs/heads/SSSD-sssd-backport-pr8762-to-sssd-2-12
git checkout SSSD-sssd-backport-pr8762-to-sssd-2-12
git push sssd-bot SSSD-sssd-backport-pr8762-to-sssd-2-12 --force

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Original commits
e5b407c - tests: fixing mypy linting errors

Backported commits

• f7772e2 - tests: fixing mypy linting errors

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Original Pull Request Body

• fixed type hint linting errors in memcache and pysss tests
• added missing error messages to assertions in pysss_nss tests
• fixed typo in method call

[gemini-code-assist]

Code Review

This pull request improves test robustness by adding None checks before accessing user and group attributes, adding explicit assertion messages, and fixing a missing parenthesis in a configuration call. The reviewer feedback highlights several issues with the newly added assertion messages, pointing out that assertions expecting empty dictionaries have misleading 'wrong SID' messages, and other assertions redundantly print the expected name twice instead of displaying the actual output to aid debugging.

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[danlavu]

@alexey-tikhonov, it is valid. Let's merge this. Here is the PR addressing the messages. #8797