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#!./perl
use strict;
use warnings;
require q(./test.pl); plan(tests => 4);
=pod
This tests the classic diamond inheritance pattern.
<A>
/ \
<B> <C>
\ /
<D>
=cut
{
package Diamond_A;
sub hello { 'Diamond_A::hello' }
}
{
package Diamond_B;
use base 'Diamond_A';
}
{
package Diamond_C;
use base 'Diamond_A';
sub hello { 'Diamond_C::hello' }
}
{
package Diamond_D;
use base ('Diamond_B', 'Diamond_C');
use mro 'dfs';
}
ok(eq_array(
mro::get_linear_isa('Diamond_D'),
[ qw(Diamond_D Diamond_B Diamond_A Diamond_C) ]
), '... got the right MRO for Diamond_D');
is(Diamond_D->hello, 'Diamond_A::hello', '... method resolved itself as expected');
is(Diamond_D->can('hello')->(), 'Diamond_A::hello', '... can(method) resolved itself as expected');
is(UNIVERSAL::can("Diamond_D", 'hello')->(), 'Diamond_A::hello', '... can(method) resolved itself as expected');
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