typing: Inheritance with `NotRequired` or `Required` in parent fields is not tested

[Eclips4]

Such case Lib/test/test_typing.py doesn't cover.

from typing import TypedDict, Required, NotRequired, get_type_hints

class Parent(TypedDict, total=False):
    field: Required[str]

class Child(Parent):
    another_field: NotRequired[str]
    
 assert Child.__required_keys__ == frozenset({"field": str})
 assert Child.__optional_keys__ == frozenset({"another_field": str})

I think, we should test it.

Linked PRs

• gh-101562: add tests for inheritance with NotRequired & Required in p… #101563
• [3.11] gh-101562: typing: add tests for inheritance with NotRequired & Required in parent fields (GH-101563) #101611