diff --git a/tests/test_format.py b/tests/test_format.py
index 823139d3..b24d172f 100644
--- a/tests/test_format.py
+++ b/tests/test_format.py
@@ -56,6 +56,10 @@ def test_safe_description(self):
             "Depends on\n\nQuestion { #2 }!",
             safe_description("Depends on\n\nQuestion { #2 }!"),
         )
+        self.assertEqual(
+            "(start_date) - cast((rolling_days))",
+            safe_description("{{start_date}} - cast({{rolling_days}})"),
+        )
 
     def test_dump_yaml(self):
         path = Path("tests") / "tmp" / "test_dump_yaml.yml"