add test

modeltranslation/_typing.py

@@ -30,12 +30,13 @@ def monkeypatch() -> None:
     ]
 
     def class_getitem(cls: type, key: str | type | TypeVar):
+
         if isinstance(key, str) and hasattr(cls, key):
             # Fix django-cms compatibility:
             # https://github.com/django-cms/django-cms/issues/7948
             raise KeyError(f"Key '{key}' found as attribute, use getattr to access it.")
         return cls
 
-    for class_ in classes:
-        if not hasattr(class_, "__class_getitem__"):
-            class_.__class_getitem__ = classmethod(class_getitem)  # type: ignore[attr-defined]
+    for cls in classes:
+        if not hasattr(cls, "__class_getitem__"):
+            cls.__class_getitem__ = classmethod(class_getitem)  # type: ignore[attr-defined]

modeltranslation/tests/tests.py

@@ -2911,6 +2911,14 @@ class ProxyTestModelAdmin(admin.TranslationAdmin):
         assert tuple(ma.get_form(request).base_fields.keys()) == tuple(fields)
         assert tuple(ma.get_form(request, self.test_obj).base_fields.keys()) == tuple(fields)
 
+    def test_class_attribute_access_raises_type_error(self):
+
+        class TestModelAdmin(admin.TranslationAdmin[models.TestModel]):
+            allow_children = True
+
+        with pytest.raises(KeyError):
+            TestModelAdmin["allow_children"]  # type: ignore
+
 
 class ThirdPartyAppIntegrationTest(ModeltranslationTestBase):
     """