let
  inherit (import ../default.nix { }) pkgs;
  inherit (pkgs) lib;
  eval =
    module:
    (lib.evalModules {
      modules = [
        module
        ./data-model.nix
      ];
    }).config;
in
{
  _class = "nix-unit";

  test-eval = {
    expr =
      let
        example = eval (
          { config, ... }:
          let
            inherit (config.resources.bar.runtime-environment) runtime-environment;
          in
          {
            providers.ssh-host =
              { ... }:
              {
                system.stateVersion = "25.05";
              };
            resources.bar.runtime-environment.ssh-host = {
              ssh = {
                host = "localhost";
                username = "root";
                authentication.password = "";
              };
            };
            applications.foo.module =
              { pkgs, ... }:
              {
                options.doll = lib.mkOption {
                  type = lib.types.str;
                };
                config.environment.systemPackages = [
                  pkgs.hello
                ];
              };
            deployments.baz = {
              inherit runtime-environment;
              application-configuration = {
                foo = {
                  doll = 123;
                };
              };
            };
            migrations.boo = {
              inherit runtime-environment;
              deployment = config.deployments.baz;
            };
          }
        );
      in
      {
        has-provider = lib.isAttrs example.providers.ssh-host;
        has-resource = lib.isAttrs example.resources.bar.runtime-environment.ssh-host.module;
        has-application = lib.isAttrs example.applications.foo.module;
        has-deployment = lib.isAttrs example.deployments.baz.application-configuration.foo.doll;
        has-migration = lib.isAttrs example.migrations.boo.deployment;
      };
    expected = {
      has-provider = true;
      has-resource = true;
      has-application = true;
      has-deployment = true;
      has-migration = true;
    };
  };
}