use strict;
use warnings;

use Test::More tests => 2;

=pod

This tests a strange bug found by Matt S. Trout
while building DBIx::Class. Thanks Matt!!!!

   <A>
  /   \
<C>   <B>
  \   /
   <D>

=cut

{
    package Diamond_A;
    use Class::C3;

    sub foo { 'Diamond_A::foo' }
}
{
    package Diamond_B;
    BEGIN { our @ISA = ('Diamond_A'); }
    use Class::C3;

    sub foo { 'Diamond_B::foo => ' . (shift)->next::method }
}
{
    package Diamond_C;
    use Class::C3;
    BEGIN { our @ISA = ('Diamond_A'); }

}
{
    package Diamond_D;
    BEGIN { our @ISA = ('Diamond_C', 'Diamond_B'); }
    use Class::C3;

    sub foo { 'Diamond_D::foo => ' . (shift)->next::method }
}

Class::C3::initialize();

is_deeply(
    [ Class::C3::calculateMRO('Diamond_D') ],
    [ qw(Diamond_D Diamond_C Diamond_B Diamond_A) ],
    '... got the right MRO for Diamond_D');

is(Diamond_D->foo,
   'Diamond_D::foo => Diamond_B::foo => Diamond_A::foo',
   '... got the right next::method dispatch path');