diff --git a/vizro-core/tests/unit/vizro/actions/test_actions_utils.py b/vizro-core/tests/unit/vizro/actions/test_actions_utils.py
index c913641e3..542a8b8e4 100644
--- a/vizro-core/tests/unit/vizro/actions/test_actions_utils.py
+++ b/vizro-core/tests/unit/vizro/actions/test_actions_utils.py
@@ -47,9 +47,15 @@ def test_update_nested_graph_properties_multiple_levels(self, graph, dot_separat
                 "red",
                 {"nodes": {"A": {"color": "blue"}, "B": "red"}},
             ),
+            (
+                {},
+                "color",
+                "red",
+                {"color": "red"}
+            )
         ],
     )
-    def test_update_nested_graph_properties_add_keys(self, graph, dot_separated_strings, value, expected):
+    def test_update_nested_graph_properties_add_or_overwrite_keys(self, graph, dot_separated_strings, value, expected):
         result = _update_nested_graph_properties(graph, dot_separated_strings, value)
         assert result == expected