added test for duplicate output headers

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.3.x@426 152afb58-edef-0310-8abb-c4023f1b3aa9

tests/LightyTest.pm

@@ -152,6 +152,12 @@ sub handle_http {
 				if ($line =~ /^([^:]+):\s*(.+)$/) {
 					(my $h = $1) =~ tr/[A-Z]/[a-z]/;
 
+					if (defined $resp_hdr{$h}) {
+						diag(sprintf("header %s is duplicated: %s and %s\n",
+						             $h, $resp_hdr{$h}, $2));
+						return -1;	
+					}
+
 					$resp_hdr{$h} = $2;
 				} else {
 					return -1;