Add failing test

Author: matmel

tests/strategies/test_include_subclasses.py

@@ -6,9 +6,10 @@
 from typing import Any
 
 import pytest
-from attrs import define
+from attrs import define, has, frozen
 
 from cattrs import Converter, override
+from cattrs.gen import make_dict_structure_fn
 from cattrs.errors import ClassValidationError, StructureHandlerNotFoundError
 from cattrs.strategies import configure_tagged_union, include_subclasses
 
@@ -536,3 +537,60 @@ class Sub(Mid1, Mid2):
     assert genconverter.structure({"_type": "Sub"}, Base) == Sub()
     assert genconverter.structure({"_type": "Mid1"}, Base) == Mid1()
     assert genconverter.structure({"_type": "Mid2"}, Base) == Mid2()
+
+
+def test_subclasses_in_struct_factory():
+    @frozen
+    class A:
+        """Base class"""
+
+    @frozen
+    class A1(A):
+        a1: int
+
+    @frozen
+    class B:
+        id: int
+        b: str
+
+    @frozen
+    class Container1:
+        id: int
+        a: A
+        b: B
+
+    @frozen
+    class Container2:
+        id: int
+        c: Container1
+        foo: str
+
+    def struct_hook_factory(cl, converter: Converter):
+        struct_hook = make_dict_structure_fn(cl, converter)
+        if not cl.__subclasses__():
+            converter.register_structure_hook(cl, struct_hook)
+
+        else:
+
+            def cls_is_cl(cls, _cl=cl):
+                return cls is _cl
+
+            converter.register_structure_hook_func(cls_is_cl, struct_hook)
+            union_strategy = partial(configure_tagged_union, tag_name="type")
+            include_subclasses(cl, converter, union_strategy=union_strategy)
+
+        return converter.get_structure_hook(cl)
+
+    converter = Converter()
+    converter.register_structure_hook_factory(has, struct_hook_factory)
+
+    unstructured = {
+        "id": 0,
+        "c": {"id": 1, "a": {"type": "A1", "a1": 42}, "b": {"id": 2, "b": "hello"}},
+        "foo": "world",
+    }
+    res = converter.structure(unstructured, Container2)
+
+    assert res == Container2(
+        id=0, c=Container1(id=1, a=A1(a1=42), b=B(id=2, b="Hello"), foo="world")
+    )