more test coverage: missing square bracket error message

Author: Boris Lytochkin

ext/snmp/tests/ipv6.phpt

@@ -20,6 +20,10 @@ snmp_set_quick_print(false);
 snmp_set_valueretrieval(SNMP_VALUE_PLAIN);
 
 var_dump(snmpget($hostname6_port, $community, '.1.3.6.1.2.1.1.1.0'));
+var_dump(snmpget('[dead:beef::', $community, '.1.3.6.1.2.1.1.1.0'));
 ?>
 --EXPECTF--
 %unicode|string%(%d) "%s"
+
+Warning: snmpget(): malformed IPv6 address, closing square bracket missing in %s on line %d
+bool(false)