anchor.diff:  
     config = {
   
  -    libvirt.test.instances.${cfg.test-driver.hostName} = {
  +    libvirt.test.domains.${cfg.test-driver.hostName} = {
         libvirt.domain.name = mkForce "dom-@testid@";
         nixos.modules = cfg.test-driver.extraModules ++ [{
           systemd.services.test-script = {
  
positive.code: 
    virshCreateCmds = concatStringsSep ";" (flatten [
      "net-create $build/libvirt/net-test.xml"
      (map (name: "create $build/libvirt/dom-${name}.xml") instNames)
    ]);
  
    virshDestroyCmds = concatStringsSep ";" (flatten [
      (map (name:
        "destroy dom-$testid-${name}"
      ) (filter (n: n != cfg.test-driver.hostName) instNames))
      "destroy dom-$testid"
      "net-destroy net-$testid"
    ]);
  
negative.code:     substring n 2 (mkMAC s)
    ));
  
    domainOpts = { name, config, lib, ... }: {
      imports = [
        ./domain.nix
        cfg.defaultInstanceConfig
  