diff --git a/test/mv/authorization/role_test.exs b/test/mv/authorization/role_test.exs
index ab1ebeb..effa000 100644
--- a/test/mv/authorization/role_test.exs
+++ b/test/mv/authorization/role_test.exs
@@ -84,6 +84,13 @@ defmodule Mv.Authorization.RoleTest do
   end
 
   # Helper function for error evaluation
+  # When field is nil, returns first error message (for errors without specific field)
+  defp error_message(errors, field) when is_nil(field) do
+    errors
+    |> Enum.map(&Map.get(&1, :message, ""))
+    |> List.first() || ""
+  end
+
   defp error_message(errors, field) do
     errors
     |> Enum.filter(fn err -> Map.get(err, :field) == field end)