anchor.diff:  
       node2 = { modulesPath, ... }: {
         virtualisation.vlans = [ ];
  +      environment.systemPackages = [ pkgs.hello ];
         imports = [
           "${modulesPath}/installer/kexec/kexec-boot.nix"
  +        "${modulesPath}/profiles/minimal.nix"
         ];
       };
     };
   
     testScript = { nodes, ... }: ''
  +    # Test whether reboot via kexec works.
       node1.wait_for_unit("multi-user.target")
       node1.succeed('kexec --load /run/current-system/kernel --initrd /run/current-system/initrd --command-line "$(</proc/cmdline)"')
       node1.execute("systemctl kexec >&2 &", check_return=False)
  
positive.code: # Test whether fast reboots via kexec work.
  
  import ./make-test-python.nix ({ pkgs, lib, ... }: {
    name = "kexec";
    meta = with lib.maintainers; {
  
negative.code:     node1.connect()
      node1.wait_for_unit("multi-user.target")
  
      # Check if the machine with kexec-boot.nix profile boots up
      node2.wait_for_unit("multi-user.target")
      node2.shutdown()
  
      # Kexec node1 to the toplevel of node2 via the kexec-boot script
      node1.succeed('touch /run/foo')
      node1.fail('hello')
      node1.execute('${nodes.node2.config.system.build.kexecBoot}/kexec-boot', check_return=False)
      node1.succeed('! test -e /run/foo')
      node1.succeed('hello')
      node1.succeed('[ "$(hostname)" = "node2" ]')
  
      node1.shutdown()
    '';
  