tests/nixpkgs-overlays.nix


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{ config, pkgs, ... }:

{
  nixpkgs.overlays = [
    (self: super:
    {
      hello = super.runCommand "hello" {} "mkdir $out";
    })
  ];

  test = ''
    echo checking /bin/hello >&2
    (! ${pkgs.hello}/bin/hello)
  '';
}