Merge branch 'main' into typing.dataclass_transform

tests/test_init_subclass.py

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: MIT
 
 """
-Tests for `__init_subclass__` related tests.
+Tests for `__init_subclass__` related functionality.
 """
 
 import attr
@@ -41,3 +41,26 @@ class Attrs(Base, param="foo"):
  pass
 
  assert "foo" == Attrs().param
+
+
+def test_init_subclass_slots_workaround():
+ """
+ `__init_subclass__` works with modern APIs if care is taken around classes
+ existing twice.
+ """
+ subs = {}
+
+ @attr.define
+ class Base:
+ def __init_subclass__(cls):
+ subs[cls.__qualname__] = cls
+
+ @attr.define
+ class Sub1(Base):
+ x: int
+
+ @attr.define
+ class Sub2(Base):
+ y: int
+
+ assert (Sub1, Sub2) == tuple(subs.values())