{self, ...}: {
  perSystem = {pkgs, ...}: {
    checks.router = pkgs.stdenv.mkDerivation {
      name = "router";
      phases = [
        "runPhase"
      ];

      env.ROUTER_CMD =
        (self.nixosConfigurations.liveusb.extendModules {
          modules = [
            "${pkgs.path}/nixos/modules/testing/test-instrumentation.nix"
          ];
        })
        .config
        .system
        .build
        .vm;

      nativeBuildInputs = with pkgs; [
        iproute2
        (python3.withPackages (ps:
          with ps; [
            ptpython
            colorama
            junit-xml
          ]))
      ];

      runPhase = ''
        PYTHONPATH=${pkgs.path}/nixos/lib/test-driver python ${./router.py}

        mkdir -p $out
        touch $out/success
      '';
    };
  };
}