Copyright (C) Internet Systems Consortium, Inc. ("ISC")

See COPYRIGHT in the source root or https://isc.org/copyright.html for terms.

This test checks whether zones configured with "type mirror;" behave as
expected.

ns1 is an authoritative-only server.  It only serves the root zone, which is
mirrored by ns3.

ns2 is an authoritative-only server.  It serves a number of zones, some of which
are delegated to it by ns1 and used in recursive resolution tests aimed at ns3
while others are only served so that ns3 has a primary server to mirror zones
from during various tests of the mirror zone implementation.

ns3 is a recursive resolver.  It has a number of mirror zones configured.  This
is the only server whose behavior is being examined by this system test.