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#!/usr/bin/perl
use strict;
use warnings;
require q(./test.pl); plan(tests => 10);
=pod
This tests the classic diamond inheritance pattern.
<A>
/ \
<B> <C>
\ /
<D>
=cut
{
package Diamond_A;
use mro 'c3';
sub bar { 'Diamond_A::bar' }
sub baz { 'Diamond_A::baz' }
}
{
package Diamond_B;
use base 'Diamond_A';
use mro 'c3';
sub baz { 'Diamond_B::baz => ' . (shift)->next::method() }
}
{
package Diamond_C;
use mro 'c3';
use base 'Diamond_A';
sub foo { 'Diamond_C::foo' }
sub buz { 'Diamond_C::buz' }
sub woz { 'Diamond_C::woz' }
sub maybe { 'Diamond_C::maybe' }
}
{
package Diamond_D;
use base ('Diamond_B', 'Diamond_C');
use mro 'c3';
sub foo { 'Diamond_D::foo => ' . (shift)->next::method() }
sub bar { 'Diamond_D::bar => ' . (shift)->next::method() }
sub buz { 'Diamond_D::buz => ' . (shift)->baz() }
sub fuz { 'Diamond_D::fuz => ' . (shift)->next::method() }
sub woz { 'Diamond_D::woz can => ' . ((shift)->next::can() ? 1 : 0) }
sub noz { 'Diamond_D::noz can => ' . ((shift)->next::can() ? 1 : 0) }
sub maybe { 'Diamond_D::maybe => ' . ((shift)->maybe::next::method() || 0) }
sub moybe { 'Diamond_D::moybe => ' . ((shift)->maybe::next::method() || 0) }
}
ok(eq_array(
mro::get_linear_isa('Diamond_D'),
[ qw(Diamond_D Diamond_B Diamond_C Diamond_A) ]
), '... got the right MRO for Diamond_D');
is(Diamond_D->foo, 'Diamond_D::foo => Diamond_C::foo', '... skipped B and went to C correctly');
is(Diamond_D->bar, 'Diamond_D::bar => Diamond_A::bar', '... skipped B & C and went to A correctly');
is(Diamond_D->baz, 'Diamond_B::baz => Diamond_A::baz', '... called B method, skipped C and went to A correctly');
is(Diamond_D->buz, 'Diamond_D::buz => Diamond_B::baz => Diamond_A::baz', '... called D method dispatched to , different method correctly');
eval { Diamond_D->fuz };
like($@, qr/^No next::method 'fuz' found for Diamond_D/, '... cannot re-dispatch to a method which is not there');
is(Diamond_D->woz, 'Diamond_D::woz can => 1', '... can re-dispatch figured out correctly');
is(Diamond_D->noz, 'Diamond_D::noz can => 0', '... cannot re-dispatch figured out correctly');
is(Diamond_D->maybe, 'Diamond_D::maybe => Diamond_C::maybe', '... redispatched D to C when it exists');
is(Diamond_D->moybe, 'Diamond_D::moybe => 0', '... quietly failed redispatch from D');
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