#!perl

BEGIN {
    if ($ENV{PERL_CORE}) {
	chdir 't' if -d 't';
	@INC = '../lib';
    }
    require Config;
    import Config;
    if ($Config{'extensions'} !~ /\bOpcode\b/) {
	print "1..0\n";
	exit 0;
    }
}

use strict;
use Test::More;
use Safe;
plan(tests => 6);

my $c = new Safe;
$c->permit(qw(require caller));

my $r = $c->reval(q!
    sub UNIVERSAL::isa { "pwned" }
    (bless[],"Foo")->isa("Foo");
!);

is( $r, "pwned", "isa overriden in compartment" );
is( (bless[],"Foo")->isa("Foo"), 1, "... but not outside" );

sub Foo::foo {}

$r = $c->reval(q!
    sub UNIVERSAL::can { "pwned" }
    (bless[],"Foo")->can("foo");
!);

is( $r, "pwned", "can overriden in compartment" );
is( (bless[],"Foo")->can("foo"), \&Foo::foo, "... but not outside" );

$r = $c->reval(q!
    utf8::is_utf8("\x{100}");
!);
is( $@, '', 'can call utf8::is_valid' );
is( $r, 1, '... returns 1' );