fix(addresses): require group visibility for book creation

tests/test_addresses_service.py

@@ -49,6 +49,7 @@ from govoplan_addresses.backend.schemas import (
 )
 from govoplan_addresses.backend.manifest import manifest
 from govoplan_addresses.backend.service import (
+    AddressBookError,
     address_book_contact_counts,
     address_list_entry_counts,
     create_address_book,
@@ -146,6 +147,15 @@ class ReadOnlyPrincipal(Principal):
         }
 
 
+class NoGroupPrincipal(Principal):
+    group_ids = frozenset()
+
+
+class AddressBookAdminPrincipal(NoGroupPrincipal):
+    def has(self, scope: str) -> bool:
+        return scope == "addresses:address_book:admin" or super().has(scope)
+
+
 class AddressServiceTest(unittest.TestCase):
     def setUp(self) -> None:
         engine = create_engine("sqlite:///:memory:")
@@ -169,6 +179,29 @@ class AddressServiceTest(unittest.TestCase):
         self.session = sessionmaker(bind=engine)()
         self.principal = Principal()
 
+    def test_group_book_creation_requires_membership_or_admin_scope(self) -> None:
+        with self.assertRaisesRegex(AddressBookError, "selected group is not visible"):
+            create_address_book(
+                self.session,
+                NoGroupPrincipal(),
+                AddressBookCreateRequest(scope_type="group", group_id="group-2", name="Unassigned"),
+            )
+
+        with self.assertRaisesRegex(AddressBookError, "selected group is not visible"):
+            create_address_book(
+                self.session,
+                self.principal,
+                AddressBookCreateRequest(scope_type="group", group_id="group-2", name="Other group"),
+            )
+
+        admin_book = create_address_book(
+            self.session,
+            AddressBookAdminPrincipal(),
+            AddressBookCreateRequest(scope_type="group", group_id="group-2", name="Admin-created"),
+        )
+
+        self.assertEqual(admin_book.scope_id, "group-2")
+
     def test_scoped_book_contact_lookup_and_soft_delete(self) -> None:
         book = create_address_book(self.session, self.principal, AddressBookCreateRequest(scope_type="user", name="Personal"))
         self.session.commit()