anchor.diff:  
   
     # The configuration to install.
  -  config = { fileSystems, testChannel }: pkgs.writeText "configuration.nix"
  +  config = { fileSystems, testChannel, grubVersion }: pkgs.writeText "configuration.nix"
       ''
         { config, pkgs, modulesPath, ... }:
   
  
positive.code:     '';
  
  
    makeTest = { createPartitions, fileSystems, testChannel ? false }:
      { inherit iso;
        nodes = if testChannel then { inherit webserver; } else { };
        testScript = testScriptFun {
          inherit createPartitions fileSystems testChannel;
        };
      };
  
  
negative.code:               [ pkgs.glibcLocales
                  pkgs.sudo
                  pkgs.docbook5
                  pkgs.grub
                ];
            }
          ];
  