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