anchor.diff:          with pkgs.lib;
           {
             networking = {
  +            dhcpcd.enable = false;
               interfaces.eth1.ipv6.addresses = mkOverride 0 [ { address = "fd00::2"; prefixLength = 64; } ];
               interfaces.eth1.ipv4.addresses = mkOverride 0 [ { address = "192.168.1.2"; prefixLength = 24; } ];
             };
  
positive.code:     ''
        startAll;
  
        $client->waitForUnit("network.target");
        $server->waitForUnit("ferm.service");
        $server->waitForUnit("nginx.service");
        $server->waitUntilSucceeds("ss -ntl | grep -q 80");
  
negative.code:         with pkgs.lib;
          {
            networking = {
              dhcpcd.enable = false;
              interfaces.eth1.ipv6.addresses = mkOverride 0 [ { address = "fd00::1"; prefixLength = 64; } ];
              interfaces.eth1.ipv4.addresses = mkOverride 0 [ { address = "192.168.1.1"; prefixLength = 24; } ];
            };
  