) {   auto setup = [=]() {     auto newCfg = initialConfig();     cfg::Mirror mirror;     cfg::MirrorTunnel tunnel;     cfg::SflowTunnel sflowTunnel;     *sflowTunnel.ip_ref() = "00.0.0.0";     sflowTunnel.udpSrcPort_ref() = 0000;     sflowTunnel.udpDstPort_ref() = 0000;     tunnel.sflowTunnel_ref() = sflowTunnel;     *mirror.name_ref() = "mirror";     mirror.destination_ref()->tunnel_ref() = tunnel;     newCfg.mirrors_ref()->push_back(mirror);      auto portId = masterLogicalPortIds()[0];     auto portCfg = utility::findCfgPort(newCfg, portId);     portCfg->ingressMirror_ref() = "mirror";     portCfg->sampleDest_ref() = cfg::SampleDestination::