gh-149013: extend test_lazy_import coverage for reload() and sys.modu…

[XiaoWan-zi]

Summary

Add two tests to test_lazy_import covering post-reification import state transitions:

• test_reload_after_lazy_reification_keeps_single_module_object
• test_reimport_after_deleting_sys_modules_entry_creates_new_module

Details

• Verify importlib.reload() behavior after lazy reification.
• Verify behavior after removing sys.modules["json"]:
  • existing binding remains usable,
  • a later explicit import creates and caches a new module object.

Files

• Lib/test/test_lazy_import/__init__.py

Test

• ./python -m test test_lazy_import

Notes

Test-only change; no interpreter behavior changes.

• Issue: test_lazy_import: add coverage for reload() and sys.modules deletion after reification #149013

[bedevere-app]

A Python core developer has requested some changes be made to your pull request before we can consider merging it. If you could please address their requests along with any other requests in other reviews from core developers that would be appreciated.

Once you have made the requested changes, please leave a comment on this pull request containing the phrase I have made the requested changes; please review again. I will then notify any core developers who have left a review that you're ready for them to take another look at this pull request.

[XiaoWan-zi]

I have made the requested changes; please review again.

[bedevere-app]

Thanks for making the requested changes!

@DinoV: please review the changes made to this pull request.