anchor.diff:    substituteAll ${./bees-service-wrapper} "$out"/bin/bees-service-wrapper
     chmod +x "$out"/bin/bees-service-wrapper
     ln -s ${bees}/bin/beesd "$out"/bin/beesd
  -''
  +'').overrideAttrs (old: {
  +  passthru.tests = {
  +    smoke-test = nixosTests.bees;
  +  };
  +})
  
positive.code: 
  in
  
  runCommand "bees-service" {
    inherit bash bees coreutils;
    utillinux = util-linux; # needs to be a valid shell variable name
    btrfsProgs = btrfs-progs; # needs to be a valid shell variable name
  
negative.code: { lib, stdenv, runCommand, fetchFromGitHub, bash, btrfs-progs, coreutils
  , python3Packages, util-linux, nixosTests }:
  
  let
  
  