nixpkgs/nixos/tests/bind.nix

{ ... }:
{
  name = "bind";

  nodes.machine =
    { pkgs, lib, ... }:
    {
      services.bind.enable = true;
      services.bind.extraOptions = "empty-zones-enable no;";
      services.bind.zones = lib.singleton {
        name = ".";
        master = true;
        file = pkgs.writeText "root.zone" ''
          $TTL 3600
          . IN SOA ns.example.org. admin.example.org. ( 1 3h 1h 1w 1d )
          . IN NS ns.example.org.

          ns.example.org. IN A    192.168.0.1
          ns.example.org. IN AAAA abcd::1

          1.0.168.192.in-addr.arpa IN PTR ns.example.org.
        '';
      };
    };

  testScript = ''
    machine.wait_for_unit("bind.service")
    machine.succeed("host 192.168.0.1 127.0.0.1 | grep -qF ns.example.org")
  '';
}