nixos: tests: kernelGeneric: Fix testsForKernel when accessed outside nixosTests (#453651)

        nodes.machine =

          { config, ... }:

          {

            # we could/would do something like below, but linuxPackages comes from outside

            # the machine closure, so an overlay doesn't apply to the kernelPackages.

            # nixpkgs.overlays = [

            #   (final: prev: {

            #     kernelPackagesExtensions = prev.kernelPackagesExtensions ++ [ helloWorldExtension ];

            #   })

            # ]

            boot.kernelPackages = linuxPackages;

            boot.extraModulePackages = [ config.boot.kernelPackages.hello-world ];

    # Useful for development testing of all Kernel configs without building full Kernel

    configfiles = mapAttrs (_: lP: lP.kernel.configfile) kernels;

    testsForKernel = kernel: testsForLinuxPackages (pkgs.linuxPackagesFor kernel);

    testsForKernel = kernel: testsForLinuxPackages (patchedPkgs.linuxPackagesFor kernel);

  };

}