anchor.diff:                {pkgs, config, ...}:
                 
                 {
  -                virtualisation.writableStore = true;      
  +                virtualisation.writableStore = true;
                   environment.systemPackages = [ disnix DisnixWebService pkgs.stdenv ];
                 };
  -          };        
  +          };
             testScript = 
               ''
                 startAll;
  
positive.code: 
          distPhase = ''
            cd doc
            make docbookrng=${docbook5}/xml/rng/docbook docbookxsl=${docbook5_xsl}/xml/xsl/docbook
            cp index.pdf $out
            cd ..
            ant install.doc
  
negative.code:               {
                  virtualisation.writableStore = true;
                  
                  networking.firewall.allowedTCPPorts = [ 22 8080 ];
                  
                  services.dbus.enable = true;
                  services.dbus.packages = [ disnix ];
              
                  jobs.disnix =
                    { description = "Disnix server";
  
                      wantedBy = [ "multi-user.target" ];
                      after = [ "dbus.service" ];
                  
                      path = [ pkgs.nix pkgs.getopt disnix dysnomia ];
                      environment = {
                        HOME = "/root";
                      };
  
                      exec = "disnix-service";
                    };
  
                  ids.gids = { disnix = 200; };
                  users.extraGroups = [ { gid = 200; name = "disnix"; } ];
  