-$rs->sort("dummy", "1=4 >i");
-### There's no way to check for success, as this is a void function
+my $status = $rs->sort("yaz", "1=4>i");
+ok($status < 0, "malformed sort criterion rejected");
+$status = $rs->sort("yaz", "1=4 >i");
+ok($status == 0, "sort criterion accepted");