CPAN::Groonga

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

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

use Scalar::Util 'refaddr';

subtest 'test the concat method' => sub {
  my $string       = Data::Object::String->new('ABC');
  my $concatenated = $string->concat('DEF', 'GHI');

  isnt refaddr($string), refaddr($concatenated);
  is "$concatenated", 'ABCDEFGHI';    # ABCDEFGHI

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

ok 1 and done_testing;