CPAN::Groonga

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

use_ok 'Data::Object::Code';
# deprecated
# can_ok 'Data::Object::Code', 'next';

use Scalar::Util 'refaddr';

subtest 'test the next method' => sub {
  my $code = Data::Object::Code->new(sub { (shift // 0) + 1 });
  my $next = $code->next(undef);

  my $result;

  isnt refaddr($code), refaddr($next);
  is $next, 1;

  $next = $code->next(0);
  isa_ok $next, 'Data::Object::Number';

  isnt refaddr($code), refaddr($next);
  is $next, 1;

  $next = $code->next(1);
  isa_ok $next, 'Data::Object::Number';

  isnt refaddr($code), refaddr($next);
  is $next, 2;

  $next = $code->next(2);
  isa_ok $next, 'Data::Object::Number';

  isnt refaddr($code), refaddr($next);
  is $next, 3;

  isa_ok $code, 'Data::Object::Code';
  isa_ok $next, 'Data::Object::Number';
};

ok 1 and done_testing;