#!/usr/bin/perl
use strict;
use warnings;
use Test::More tests => 10;
=pod
This tests the classic diamond inheritence pattern.
<A>
/ \
<B> <C>
\ /
<D>
=cut
{
package Diamond_A;
use Class::C3;
sub hello { 'Diamond_A::hello' }
}
{
package Diamond_B;
use base 'Diamond_A';
use Class::C3;
}
{
package Diamond_C;
use Class::C3;
use base 'Diamond_A';
sub hello { 'Diamond_C::hello' }
}
{
package Diamond_D;
use base ('Diamond_B', 'Diamond_C');
use Class::C3;
}
Class::C3::initialize();
is_deeply(
[ Class::C3::calculateMRO('Diamond_D') ],
[ qw(Diamond_D Diamond_B Diamond_C Diamond_A) ],
'... got the right MRO for Diamond_D');
is(Diamond_D->hello, 'Diamond_C::hello', '... method resolved itself as expected');
is(Diamond_D->can('hello')->(), 'Diamond_C::hello', '... can(method) resolved itself as expected');
is(UNIVERSAL::can("Diamond_D", 'hello')->(), 'Diamond_C::hello', '... can(method) resolved itself as expected');
# now undo the C3
Class::C3::uninitialize();
is(Diamond_D->hello, 'Diamond_A::hello', '... old method resolution has been restored');
is(Diamond_D->can('hello')->(), 'Diamond_A::hello', '... can(method) resolution has been restored');
is(UNIVERSAL::can("Diamond_D", 'hello')->(), 'Diamond_A::hello', '... can(method) resolution has been restored');
Class::C3::initialize();
is(Diamond_D->hello, 'Diamond_C::hello', '... C3 method restored itself as expected');
is(Diamond_D->can('hello')->(), 'Diamond_C::hello', '... C3 can(method) restored itself as expected');
is(UNIVERSAL::can("Diamond_D", 'hello')->(), 'Diamond_C::hello', '... C3 can(method) restored itself as expected');