nixpkgs/nixos/tests/sx.nix

import ./make-test-python.nix (
  { pkgs, lib, ... }:
  {
    name = "sx";
    meta.maintainers = with lib.maintainers; [
      figsoda
      thiagokokada
    ];

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

        environment.systemPackages = with pkgs; [ icewm ];

        services.getty.autologinUser = "alice";

        services.xserver = {
          enable = true;
          displayManager.sx.enable = true;
        };

        # Create sxrc file on login and start sx
        programs.bash.loginShellInit =
          # bash
          ''
            mkdir -p "$HOME/.config/sx"
            echo 'exec icewm' > "$HOME/.config/sx/sxrc"
            chmod +x "$HOME/.config/sx/sxrc"

            sx
          '';
      };

    testScript =
      { nodes, ... }:
      let
        user = nodes.machine.users.users.alice;
      in
      # python
      ''
        start_all()

        machine.wait_for_unit("multi-user.target")

        xauthority = "${user.home}/.local/share/sx/xauthority"
        machine.wait_for_file(xauthority)
        machine.succeed(f"xauth merge {xauthority}")

        def icewm_is_visible(_last_try: bool) -> bool:
            # sx will set DISPLAY as the TTY number we started, in this case
            # TTY1:
            # https://github.com/Earnestly/sx/blob/master/sx#L41.
            # We can't use `machine.wait_for_window` here since we are running
            # X as alice and not root.
            return "IceWM" in machine.succeed("DISPLAY=:1 xwininfo -root -tree")

        # Adding a retry logic to increase reliability
        retry(icewm_is_visible)
      '';
  }
)