CPAN::Groonga

use strict;
use warnings;
use Test::More;

use_ok 'Data::Object::String';
# deprecated
# can_ok 'Data::Object::String', 'uppercase';

use Scalar::Util 'refaddr';

subtest 'test the uppercase method' => sub {
  my $string    = Data::Object::String->new('exciting');
  my $uppercase = $string->uppercase;

  isnt refaddr($string), refaddr($uppercase);
  is "$uppercase", 'EXCITING';

  isa_ok $string,    'Data::Object::String';
  isa_ok $uppercase, 'Data::Object::String';
};

ok 1 and done_testing;