{ lib, pkgs, ... }:
{
  name = "livebook-service";

  nodes = {
    machine =
      { config, pkgs, ... }:
      {
        imports = [
          ./common/user-account.nix
        ];

        services.livebook = {
          enableUserService = true;
          environment = {
            LIVEBOOK_PORT = 20123;
          };
          environmentFile = pkgs.writeText "livebook.env" ''
            LIVEBOOK_PASSWORD = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
          '';
        };
      };
  };

  testScript =
    { nodes, ... }:
    let
      user = nodes.machine.users.users.alice;
      sudo = lib.concatStringsSep " " [
        "XDG_RUNTIME_DIR=/run/user/${toString user.uid}"
        "sudo"
        "--preserve-env=XDG_RUNTIME_DIR"
        "-u"
        "alice"
      ];
    in
    ''
      machine.wait_for_unit("multi-user.target")

      machine.succeed("loginctl enable-linger alice")
      machine.wait_until_succeeds("${sudo} systemctl --user is-active livebook.service")
      machine.wait_for_open_port(20123, timeout=10)

      machine.succeed("curl -L localhost:20123 | grep 'Type password'")
    '';
}
