diff --git a/tests/app/dao/notification_dao/test_notification_dao_delete_notifications.py b/tests/app/dao/notification_dao/test_notification_dao_delete_notifications.py
index 1479921bd..8c39c4ccb 100644
--- a/tests/app/dao/notification_dao/test_notification_dao_delete_notifications.py
+++ b/tests/app/dao/notification_dao/test_notification_dao_delete_notifications.py
@@ -186,6 +186,20 @@ def test_delete_notifications_does_try_to_delete_from_s3_when_letter_has_not_bee
     mock_get_s3.assert_not_called()
 
 
+def test_delete_notifications_calls_subquery(
+        notify_db_session, mocker
+):
+    service = create_service()
+    sms_template = create_template(service=service)
+    create_notification(template=sms_template, created_at=datetime.now() - timedelta(days=8))
+    create_notification(template=sms_template, created_at=datetime.now() - timedelta(days=8))
+    create_notification(template=sms_template, created_at=datetime.now() - timedelta(days=8))
+
+    assert Notification.query.count() == 3
+    delete_notifications_created_more_than_a_week_ago_by_type('sms', qry_limit=1)
+    assert Notification.query.count() == 0
+
+
 def _create_templates(sample_service):
     email_template = create_template(service=sample_service, template_type='email')
     sms_template = create_template(service=sample_service)