diff --git a/metadata-db-app/test/cmr/metadata_db/test/services/subscriptions_test.clj b/metadata-db-app/test/cmr/metadata_db/test/services/subscriptions_test.clj
index fd3e8b557f..b02904c6ae 100644
--- a/metadata-db-app/test/cmr/metadata_db/test/services/subscriptions_test.clj
+++ b/metadata-db-app/test/cmr/metadata_db/test/services/subscriptions_test.clj
@@ -54,7 +54,8 @@
     (testing "Add-to-existing-mode"
       (are3
        [expected existing-modes new-modes]
-       (is (= expected (subscriptions/add-to-existing-mode existing-modes new-modes)))
+       (is (= (set expected) 
+              (set (subscriptions/add-to-existing-mode existing-modes new-modes))))
 
        "new subscription with no existing modes in cache."
        ["New" "Update" "Delete"]
@@ -66,6 +67,11 @@
        []
        ["Delete"]
 
+       "Adding new subscription with existing mode in cache of a different value."
+       ["Delete" "New"]
+       ["New"]
+       ["Delete"]
+
        "Adding new subscription with existing modes."
        ["New" "Delete"]
        ["New"]