lowdown: add nix to passthru.tests

{ lib, stdenv, fetchurl, fixDarwinDylibNames, which

, enableShared ? !(stdenv.hostPlatform.isStatic)

, enableStatic ? stdenv.hostPlatform.isStatic

# for passthru.tests

, nix

}:

stdenv.mkDerivation rec {

  doCheck = true;

  checkTarget = "regress";

  passthru.tests = {

    # most important consumer in nixpkgs

    inherit nix;

  };

  meta = with lib; {

    homepage = "https://kristaps.bsd.lv/lowdown/";

    description = "Simple markdown translator";