-sub check_taint_not ($) {
- ok((not is_tainted($_[0])), "verify that isn't tainted");
+sub check_taint_not ($;$) {
+ my $message_tail = $_[1] // "";
+ $message_tail = ": $message_tail" if $message_tail;
+ ok((not is_tainted($_[0])), "verify that isn't tainted$message_tail");