lib/tests: add mkPackageOption tests

checkConfigOutput '^false$' config.enable ./alias-with-priority-can-override.nix

checkConfigOutput '^false$' config.enableAlias ./alias-with-priority-can-override.nix

# Check mkPackageOption

checkConfigOutput '^"hello"$' config.package.pname ./declare-mkPackageOption.nix

checkConfigError 'The option .undefinedPackage. is used but not defined' config.undefinedPackage ./declare-mkPackageOption.nix

checkConfigOutput '^null$' config.nullablePackage ./declare-mkPackageOption.nix

# submoduleWith

## specialArgs should work

{ lib, ... }: let

  pkgs.hello = {

    type = "derivation";

    pname = "hello";

  };

in {

  options = {

    package = lib.mkPackageOption pkgs "hello" { };

    undefinedPackage = lib.mkPackageOption pkgs "hello" {

      default = null;

    };

    nullablePackage = lib.mkPackageOption pkgs "hello" {

      nullable = true;

      default = null;

    };

  };

}