anchor.diff:            mkdir -p $out/nix-support
             fn=$(echo $ova/*.ova)
             echo "file ova $fn" >> $out/nix-support/hydra-build-products
  -        '' # */
  +        '') # */
   
     );
   
  
positive.code:   tests.firefox = callTest tests/firefox.nix {};
    tests.firewall = callTest tests/firewall.nix {};
    tests.gnome3 = callTest tests/gnome3.nix {};
    tests.installer.efi = forAllSystems (system: (import tests/installer.nix { inherit system; }).efi.test);
    tests.installer.grub1 = forAllSystems (system: (import tests/installer.nix { inherit system; }).grub1.test);
    tests.installer.lvm = forAllSystems (system: (import tests/installer.nix { inherit system; }).lvm.test);
    tests.installer.rebuildCD = forAllSystems (system: (import tests/installer.nix { inherit system; }).rebuildCD.test);
    tests.installer.separateBoot = forAllSystems (system: (import tests/installer.nix { inherit system; }).separateBoot.test);
    tests.installer.simple = forAllSystems (system: (import tests/installer.nix { inherit system; }).simple.test);
    tests.installer.simpleLabels = forAllSystems (system: (import tests/installer.nix { inherit system; }).simpleLabels.test);
    tests.installer.simpleProvided = forAllSystems (system: (import tests/installer.nix { inherit system; }).simpleProvided.test);
    tests.installer.btrfsSimple = forAllSystems (system: (import tests/installer.nix { inherit system; }).btrfsSimple.test);
    tests.installer.btrfsSubvols = forAllSystems (system: (import tests/installer.nix { inherit system; }).btrfsSubvols.test);
    tests.installer.btrfsSubvolDefault = forAllSystems (system: (import tests/installer.nix { inherit system; }).btrfsSubvolDefault.test);
    tests.influxdb = callTest tests/influxdb.nix {};
    tests.ipv6 = callTest tests/ipv6.nix {};
    tests.jenkins = callTest tests/jenkins.nix {};
  
negative.code: 
    forAllSystems = pkgs.lib.genAttrs supportedSystems;
  
    scrubDrv = drv: let res = { inherit (drv) drvPath outPath type name; outputName = "out"; out = res; }; in res;
  
    callTest = fn: args: forAllSystems (system: scrubDrv (import fn ({ inherit system; } // args)));
  
    pkgs = import nixpkgs { system = "x86_64-linux"; };
  
  