let
  sources = import ../nix/sources.nix;
  pkgs = import sources.nixpkgs { };
  language-puppet = import sources.language-puppet { };

  filter = path: type:
    type != "symlink"
    && baseNameOf path != "puppet-env";

  haskellPackages = pkgs.haskellPackages.override {
    overrides = self: super: { language-puppet = language-puppet; };
  };

  unit-test = pkgs.haskell.lib.dontHaddock
    (haskellPackages.callCabal2nix "puppet-unit-test" (builtins.path {
      name = "puppet-unit-test";
      inherit filter;
      path = ./.;
    }) { });

in

unit-test