diff --git a/t_operator_test.go b/t_operator_test.go
index a06c4d5..668f883 100644
--- a/t_operator_test.go
+++ b/t_operator_test.go
@@ -36,6 +36,7 @@ func TestOperator(t *testing.T) {
 		/*  23 */ {`[1,2,3] map var("_")`, newList([]any{int64(1), int64(2), int64(3)}), nil},
 		/*  24 */ {`[1,2,3] map $_`, newList([]any{int64(1), int64(2), int64(3)}), nil},
 		/*  25 */ {`[1,2,3,4] filter ($_ % 2 == 0)`, newList([]any{int64(2), int64(4)}), nil},
+		/*  26 */ {`max=0; [2,3,1] digest max=(($_ > max) ? {$_} :: {max})`, int64(3), nil},
 	}
 
 	// t.Setenv("EXPR_PATH", ".")