4387. [bug] Change 4336 was not complete leading to SERVFAIL

being return as NS records expired. [RT #42683]

bin/tests/system/zero/ns2/named.conf

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2013  Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (C) 2013, 2016  Internet Systems Consortium, Inc. ("ISC")
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -35,3 +35,7 @@ zone "example" {
 	file "example.db";
 };
 
+zone "tld" {
+	type master;
+	file "tld.db";
+};