nixpkgs/nixos/tests/bind.nix

import ./make-test-python.nix {
  name = "bind";

  machine = { pkgs, lib, ... }: {
    services.bind.enable = true;
    services.bind.extraOptions = "empty-zones-enable no;";
    services.bind.zones = lib.singleton {
      name = ".";
      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.wait_for_open_port(53)
    machine.succeed("host 192.168.0.1 127.0.0.1 | grep -qF ns.example.org")
  '';
}