anchor.diff:  let
  -  mkTest = { systemWide ? false }:
  +  mkTest = { systemWide ? false , fullVersion ? false }:
       import ./make-test-python.nix ({ pkgs, lib, ... }:
         let
           testFile = pkgs.fetchurl {
  
positive.code:               enable = true;
                support32Bit = true;
                inherit systemWide;
              };
  
              environment.systemPackages = [ testers.testPlay pkgs.pavucontrol ]
  
negative.code:         '';
        });
  in builtins.mapAttrs (key: val: mkTest val) {
    user = { systemWide = false; fullVersion = false; };
    system = { systemWide = true; fullVersion = false; };
    userFull = { systemWide = false; fullVersion = true; };
    systemFull = { systemWide = true; fullVersion = true; };
  }
  