1#!./perl
2
3use strict;
4use warnings;
5use utf8;
6use open qw( :utf8 :std );
7
8require q(./test.pl); plan(tests => 4);
9
10=pod
11
12This tests the classic diamond inheritance pattern.
13
14   <A>
15  /   \
16<B>   <C>
17  \   /
18   <D>
19
20=cut
21
22{
23    package Ｄiᚪၚd_A;
24    sub hèllò { 'Ｄiᚪၚd_A::hèllò' }
25}
26{
27    package Ｄiᚪၚd_B;
28    use base 'Ｄiᚪၚd_A';
29}
30{
31    package Ｄiᚪၚd_C;
32    use base 'Ｄiᚪၚd_A';
33
34    sub hèllò { 'Ｄiᚪၚd_C::hèllò' }
35}
36{
37    package Ｄiᚪၚd_D;
38    use base ('Ｄiᚪၚd_B', 'Ｄiᚪၚd_C');
39    use mro 'dfs';
40}
41
42ok(eq_array(
43    mro::get_linear_isa('Ｄiᚪၚd_D'),
44    [ qw(Ｄiᚪၚd_D Ｄiᚪၚd_B Ｄiᚪၚd_A Ｄiᚪၚd_C) ]
45), '... got the right MRO for Ｄiᚪၚd_D');
46
47is(Ｄiᚪၚd_D->hèllò, 'Ｄiᚪၚd_A::hèllò', '... method resolved itself as expected');
48is(Ｄiᚪၚd_D->can('hèllò')->(), 'Ｄiᚪၚd_A::hèllò', '... can(method) resolved itself as expected');
49is(UNIVERSAL::can("Ｄiᚪၚd_D", 'hèllò')->(), 'Ｄiᚪၚd_A::hèllò', '... can(method) resolved itself as expected');
50