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+#!./perl
+
+use strict;
+use warnings;
+BEGIN {
+ unless (-d 'blib') {
+ chdir 't' if -d 't';
+ @INC = '../lib';
+ }
+}
+
+use Test::More tests => 10;
+
+=pod
+
+This example is take from: http://www.python.org/2.3/mro.html
+
+"My first example"
+class O: pass
+class F(O): pass
+class E(O): pass
+class D(O): pass
+class C(D,F): pass
+class B(D,E): pass
+class A(B,C): pass
+
+
+ 6
+ ---
+Level 3 | O | (more general)
+ / --- \
+ / | \ |
+ / | \ |
+ / | \ |
+ --- --- --- |
+Level 2 3 | D | 4| E | | F | 5 |
+ --- --- --- |
+ \ \ _ / | |
+ \ / \ _ | |
+ \ / \ | |
+ --- --- |
+Level 1 1 | B | | C | 2 |
+ --- --- |
+ \ / |
+ \ / \ /
+ ---
+Level 0 0 | A | (more specialized)
+ ---
+
+=cut
+
+{
+ package Test::O;
+ use mro 'c3';
+
+ package Test::F;
+ use mro 'c3';
+ use base 'Test::O';
+
+ package Test::E;
+ use base 'Test::O';
+ use mro 'c3';
+
+ sub C_or_E { 'Test::E' }
+
+ package Test::D;
+ use mro 'c3';
+ use base 'Test::O';
+
+ sub C_or_D { 'Test::D' }
+
+ package Test::C;
+ use base ('Test::D', 'Test::F');
+ use mro 'c3';
+
+ sub C_or_D { 'Test::C' }
+ sub C_or_E { 'Test::C' }
+
+ package Test::B;
+ use mro 'c3';
+ use base ('Test::D', 'Test::E');
+
+ package Test::A;
+ use base ('Test::B', 'Test::C');
+ use mro 'c3';
+}
+
+is_deeply(
+ mro::get_linear_isa('Test::F'),
+ [ qw(Test::F Test::O) ],
+ '... got the right MRO for Test::F');
+
+is_deeply(
+ mro::get_linear_isa('Test::E'),
+ [ qw(Test::E Test::O) ],
+ '... got the right MRO for Test::E');
+
+is_deeply(
+ mro::get_linear_isa('Test::D'),
+ [ qw(Test::D Test::O) ],
+ '... got the right MRO for Test::D');
+
+is_deeply(
+ mro::get_linear_isa('Test::C'),
+ [ qw(Test::C Test::D Test::F Test::O) ],
+ '... got the right MRO for Test::C');
+
+is_deeply(
+ mro::get_linear_isa('Test::B'),
+ [ qw(Test::B Test::D Test::E Test::O) ],
+ '... got the right MRO for Test::B');
+
+is_deeply(
+ mro::get_linear_isa('Test::A'),
+ [ qw(Test::A Test::B Test::C Test::D Test::E Test::F Test::O) ],
+ '... got the right MRO for Test::A');
+
+is(Test::A->C_or_D, 'Test::C', '... got the expected method output');
+is(Test::A->can('C_or_D')->(), 'Test::C', '... can got the expected method output');
+is(Test::A->C_or_E, 'Test::C', '... got the expected method output');
+is(Test::A->can('C_or_E')->(), 'Test::C', '... can got the expected method output');