{
  inputs,
  self,
  ...
}:
let
  module = ./default.nix;
in
{
  clan.modules = {
    phonebox-global = module;
  };
  perSystem =
    { pkgs, ... }:
    {
      clan.nixosTests.service-phonebox-global = {
        imports = [ ./tests/vm/default.nix ];
        _module.args = { inherit self inputs; };

        clan.modules."@clan/phonebox-global" = module;
      };

      # Unit tests for the directory sync logic (record verification,
      # address derivation, collision handling, file output).
      checks.phonebox-global-sync =
        pkgs.runCommand "phonebox-global-sync-test"
          {
            nativeBuildInputs = [
              (pkgs.python3.withPackages (ps: [ ps.cryptography ]))
              pkgs.yggdrasil
            ];
            PHONEBOX_SYNC = ./phonebox-sync.py;
          }
          ''
            python3 ${./tests/sync/test_sync.py} -v
            touch $out
          '';
    };
}