CPAN::Groonga

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

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

use Scalar::Util 'refaddr';

subtest 'test the invert method' => sub {
  my $hash = Data::Object::Hash->new({1 .. 8, 9, undef, 10, ''});

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

  isnt refaddr($hash), refaddr($invert);
  is_deeply $invert, {'' => 10, 2 => 1, 4 => 3, 6 => 5, 8 => 7};

  isa_ok $hash,   'Data::Object::Hash';
  isa_ok $invert, 'Data::Object::Hash';
};

ok 1 and done_testing;