{
  lib,
  config,
  inputs,
  ...
}:
{
  _class = "nixosTest";
  imports = [
    ../common/data-model-options.nix
  ];

  name = "deployment-model";
  sourceFileset = lib.fileset.unions [
    ../../data-model.nix
    ../../function.nix
    ../common/data-model.nix
    ../common/data-model-options.nix
    ./constants.nix
    (config.pathToCwd + "/flake-under-test.nix")
  ];

  nodes.deployer =
    { pkgs, ... }:
    {
      environment.systemPackages = with pkgs; [
        inputs.nixops4.packages.${system}.default
        jq
      ];

      # FIXME: sad times
      system.extraDependencies = with pkgs; [
        jq
        jq.inputDerivation
      ];

      system.extraDependenciesFromModule =
        { pkgs, ... }:
        {
          environment.systemPackages = with pkgs; [
            hello
          ];
        };
    };

  extraTestScript = ''
    with subtest("nixops4"):
      nixops4.fail("hello 1>&2")
      deployer.succeed("nixops4 apply check-deployment-model --show-trace --verbose --no-interactive 1>&2")
      nixops4.succeed("su - operator -c hello 1>&2")
  '';
}