diff --git a/ckanext/relationship/tests/logic/test_action.py b/ckanext/relationship/tests/logic/test_action.py
index 5be52f1..de3d91a 100644
--- a/ckanext/relationship/tests/logic/test_action.py
+++ b/ckanext/relationship/tests/logic/test_action.py
@@ -57,7 +57,7 @@ def test_does_not_create_duplicate_relation(self):
             relation_type=relation_type,
         )
 
-        assert result is None
+        assert result == []
 
     def test_relation_is_added_to_db(self):
         subject_dataset = factories.Dataset()