#!/usr/bin/perl

use strict;

BEGIN { $^W = 1 }

use Test::More;

use Sub::Uplevel;

plan tests => 3;

sub get_caller {

    return caller(shift);

}

sub wrapper {

    my $height = shift;

    return uplevel 1, \&get_caller, $height;

}

{

  my @caller = wrapper(0);

  ok(scalar @caller, "caller(N) in stack returns list");

}

{

  my @caller = wrapper(1);

  is(scalar @caller, 0, "caller(N) out of stack returns empty list");

}

{

  my @caller = caller;

  is(scalar @caller, 0, "caller from main returns empty list");

}