xref: /openbsd/gnu/usr.bin/perl/t/mro/basic_02_c3.t (revision d415bd75) 
1#!./perl
2
3use strict;
4use warnings;
5
6require q(./test.pl); plan(tests => 10);
7
8=pod
9
10This example is take from: http://www.python.org/2.3/mro.html
11
12"My first example"
13class O: pass
14class F(O): pass
15class E(O): pass
16class D(O): pass
17class C(D,F): pass
18class B(D,E): pass
19class A(B,C): pass
20
21
22                          6
23                         ---
24Level 3                 | O |                  (more general)
25                      /  ---  \
26                     /    |    \                      |
27                    /     |     \                     |
28                   /      |      \                    |
29                  ---    ---    ---                   |
30Level 2        3 | D | 4| E |  | F | 5                |
31                  ---    ---    ---                   |
32                   \  \ _ /       |                   |
33                    \    / \ _    |                   |
34                     \  /      \  |                   |
35                      ---      ---                    |
36Level 1            1 | B |    | C | 2                 |
37                      ---      ---                    |
38                        \      /                      |
39                         \    /                      \ /
40                           ---
41Level 0                 0 | A |                (more specialized)
42                           ---
43
44=cut
45
46{
47    package Test::O;
48    use mro 'c3';
49
50    package Test::F;
51    use mro 'c3';
52    use base 'Test::O';
53
54    package Test::E;
55    use base 'Test::O';
56    use mro 'c3';
57
58    sub C_or_E { 'Test::E' }
59
60    package Test::D;
61    use mro 'c3';
62    use base 'Test::O';
63
64    sub C_or_D { 'Test::D' }
65
66    package Test::C;
67    use base ('Test::D', 'Test::F');
68    use mro 'c3';
69
70    sub C_or_D { 'Test::C' }
71    sub C_or_E { 'Test::C' }
72
73    package Test::B;
74    use mro 'c3';
75    use base ('Test::D', 'Test::E');
76
77    package Test::A;
78    use base ('Test::B', 'Test::C');
79    use mro 'c3';
80}
81
82ok(eq_array(
83    mro::get_linear_isa('Test::F'),
84    [ qw(Test::F Test::O) ]
85), '... got the right MRO for Test::F');
86
87ok(eq_array(
88    mro::get_linear_isa('Test::E'),
89    [ qw(Test::E Test::O) ]
90), '... got the right MRO for Test::E');
91
92ok(eq_array(
93    mro::get_linear_isa('Test::D'),
94    [ qw(Test::D Test::O) ]
95), '... got the right MRO for Test::D');
96
97ok(eq_array(
98    mro::get_linear_isa('Test::C'),
99    [ qw(Test::C Test::D Test::F Test::O) ]
100), '... got the right MRO for Test::C');
101
102ok(eq_array(
103    mro::get_linear_isa('Test::B'),
104    [ qw(Test::B Test::D Test::E Test::O) ]
105), '... got the right MRO for Test::B');
106
107ok(eq_array(
108    mro::get_linear_isa('Test::A'),
109    [ qw(Test::A Test::B Test::C Test::D Test::E Test::F Test::O) ]
110), '... got the right MRO for Test::A');
111
112is(Test::A->C_or_D, 'Test::C', '... got the expected method output');
113is(Test::A->can('C_or_D')->(), 'Test::C', '... can got the expected method output');
114is(Test::A->C_or_E, 'Test::C', '... got the expected method output');
115is(Test::A->can('C_or_E')->(), 'Test::C', '... can got the expected method output');
116