anchor.diff:        exit "''${ret:-1}"
       '';
   
  -    mkTestStep = num: { description, config ? {}, testScript }: {
  +    mkTestStep = num: { config ? {}, testScript }: {
         systemd.sockets."test${toString num}" = {
           description = "Socket for Test Service ${toString num}";
           wantedBy = [ "sockets.target" ];
  
positive.code:   };
  
    testScript = { nodes, ... }: ''
      $machine->waitForUnit('multi-user.target');
      ${nodes.machine.config.__testSteps}
    '';
  }
  
negative.code: import ./make-test-python.nix {
    name = "systemd-confinement";
  
    machine = { pkgs, lib, ... }: let
  