CPAN::Groonga

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

use_ok 'Data::Object::Hash';
# deprecated
# can_ok 'Data::Object::Hash', 'keys';

use Scalar::Util 'refaddr';

subtest 'test the keys method' => sub {
  my $hash = Data::Object::Hash->new({1 .. 8});

  my @argument = ();
  my $keys     = $hash->keys(@argument);

  isnt refaddr($hash), refaddr($keys);
  is_deeply [sort @$keys], [1, 3, 5, 7];

  isa_ok $hash, 'Data::Object::Hash';
  isa_ok $keys, 'Data::Object::Array';
};

ok 1 and done_testing;