diff --git a/tests/models/aggregates.json b/tests/models/aggregates.json
index 0c0ae382..0dcc88fd 100644
--- a/tests/models/aggregates.json
+++ b/tests/models/aggregates.json
@@ -18,6 +18,11 @@
                 }
             ],
             "aggregates": [
+                {
+                    "name": "amount_sum",
+                    "measure": "amount",
+                    "function": "sum"
+                },
                 {
                     "name": "count",
                     "function": "count"