`test_typing.test_readonly_inheritance` does not work correctly

[sobolevn]

Bug report

cpython/Lib/test/test_typing.py

Lines 8904 to 8921 in cdfb8bc

	def test_readonly_inheritance(self):
	class Base1(TypedDict):
	a: ReadOnly[int]
	class Child1(Base1):
	b: str
	self.assertEqual(Child1.__readonly_keys__, frozenset({'a'}))
	self.assertEqual(Child1.__mutable_keys__, frozenset({'b'}))
	class Base2(TypedDict):
	a: ReadOnly[int]
	class Child2(Base2):
	b: str
	self.assertEqual(Child1.__readonly_keys__, frozenset({'a'}))
	self.assertEqual(Child1.__mutable_keys__, frozenset({'b'}))

Notice that it always tests Child1 and never Child2

Refs df4784b

I will send a PR.

Linked PRs

• gh-128617: Fix test_typing.test_readonly_inheritance #128618
• [3.13] gh-128617: Fix test_typing.test_readonly_inheritance (GH-128618) #128622

[sobolevn]

typing_extensions backport PR: python/typing_extensions#526