Update Lib/test/test_types.py

Co-authored-by: Ken Jin <[email protected]>

Author: uriyyo

Lib/test/test_types.py

@@ -670,7 +670,8 @@ def test_union_parameter_chaining(self):
         T = typing.TypeVar("T")
 
         self.assertEqual((float | list[T])[int], float | list[int])
-
+self.assertEqual(list[int | list[T]].__parameters__, (T,))
+self.assertEqual(list[int | list[T]][str], list[int | list[str]])
     def test_or_type_operator_with_forward(self):
         T = typing.TypeVar('T')
         ForwardAfter = T | 'Forward'