add test

Author: devnexen

ext/sockets/tests/socket_dontfragment.phpt

@@ -0,0 +1,19 @@
+--TEST--
+IP_MTU_DISCOVER test
+--EXTENSIONS--
+sockets
+--SKIPIF--
+<?php
+if (PHP_OS != 'Linux') {
+    die('skip For Linux only');
+}
+?>
+--FILE--
+<?php
+$socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
+socket_bind($socket, '127.0.0.1', 5557);
+$ret = socket_set_option($socket, IPPROTO_IP, IP_MTU_DISCOVER, IP_PMTUDISC_DO);
+var_dump($ret);
+?>
+--EXPECT--
+bool(true)