nixos/systemd: Add package version tests to integration tests (#443216)

{ pkgs, ... }:

{ lib, pkgs, ... }:

{

  name = "systemd";

      # Will not succeed unless ConditionFirstBoot=yes

      machine.wait_for_unit("first-boot-complete.target")

      machine.succeed(

        "journalctl --system -o cat --grep 'systemd ${lib.escapeRegex pkgs.systemd.version} running'"

      )

      assert "systemd ${lib.versions.major pkgs.systemd.version} (${pkgs.systemd.version})" in machine.succeed(

        "systemctl --version"

      )

      # Make sure, a subsequent boot isn't a ConditionFirstBoot=yes.

      machine.reboot()

      machine.wait_for_x()