Adding a test for safe system and exec calls. Part of this code by Dave.

t/3safesys.t

+# 
+# The contents of this file are subject to the Mozilla Public
+# License Version 1.1 (the "License"); you may not use this file
+# except in compliance with the License. You may obtain a copy of
+# the License at http://www.mozilla.org/MPL/
+# 
+# Software distributed under the License is distributed on an "AS
+# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+# implied. See the License for the specific language governing
+# rights and limitations under the License.
+# 
+# The Original Code are the Bugzilla Tests.
+# 
+# The Initial Developer of the Original Code is Zach Lipton
+# Portions created by Zach Lipton are 
+# Copyright (C) 2001 Zach Lipton.  All
+# Rights Reserved.
+# 
+# Contributor(s): Zach Lipton <zach@zachlipton.com>
+# 
+# Alternatively, the contents of this file may be used under the
+# terms of the GNU General Public License Version 2 or later (the
+# "GPL"), in which case the provisions of the GPL are applicable 
+# instead of those above.  If you wish to allow use of your 
+# version of this file only under the terms of the GPL and not to
+# allow others to use your version of this file under the MPL,
+# indicate your decision by deleting the provisions above and
+# replace them with the notice and other provisions required by
+# the GPL.  If you do not delete the provisions above, a recipient
+# may use your version of this file under either the MPL or the
+# GPL.
+# 
+
+#################
+#Bugzilla Test 3#
+###Safesystem####
+
+BEGIN { use Test::More tests => 51; }
+BEGIN { use lib 't/'; }
+BEGIN { use Support::Files; }
+
+@testitems = @Support::Files::testitems; 
+my $verbose = $::ENV{VERBOSE};
+$perlapp=$^X;
+foreach $file (@testitems) {
+	$file =~ s/\s.*$//; # nuke everything after the first space (#comment)
+	next if (!$file); # skip null entries
+	$command = "$perlapp -c -It/Support -MSystemexec $file 2>&1";
+	$loginfo=`$command`;
+	if ($loginfo =~ /arguments for Systemexec::system/im) {
+		ok(0,"$file DOES NOT use proper system calls");
+		if ($verbose) { print STDERR $loginfo; }
+	} else {
+		ok(1,"$file uses proper system calls");
+	}
+}
+