use strict;

use warnings;

use Test::More tests => 13;

use MRO::Compat;

{

    package AAA; our @ISA = qw//; use mro 'dfs';

    package BBB; our @ISA = qw/AAA/; use mro 'dfs';

    package CCC; our @ISA = qw/AAA/; use mro 'dfs';

    package DDD; our @ISA = qw/AAA/; use mro 'dfs';

    package EEE; our @ISA = qw/BBB CCC DDD/; use mro 'dfs';

    package FFF; our @ISA = qw/EEE DDD/; use mro 'dfs';

    package GGG; our @ISA = qw/FFF/; use mro 'dfs';

    package AAA3; our @ISA = qw//;

    sub testsub { return $_[0] . '_first_in_dfs' }

    package BBB3; our @ISA = qw/AAA3/;

    package CCC3; our @ISA = qw/AAA3/;

    sub testsub { return $_[0] . '_first_in_c3' }

    package DDD3; our @ISA = qw/AAA3/;

    package EEE3; our @ISA = qw/BBB3 CCC3 DDD3/;

    package FFF3; our @ISA = qw/EEE3 DDD3/; use mro 'c3';

    package GGG3; our @ISA = qw/FFF3/; use mro 'c3';

}

is(mro::get_mro('FFF3'), 'c3');

is_deeply(

  mro::get_linear_isa('GGG'),

  [ 'GGG', 'FFF', 'EEE', 'BBB', 'AAA', 'CCC', 'DDD' ],

  "get_linear_isa for GGG",

);

is_deeply(

  mro::get_linear_isa('GGG3'),

  [ 'GGG3', 'FFF3', 'EEE3', 'BBB3', 'CCC3', 'DDD3', 'AAA3' ],

  "get_linear_isa for GGG3",

);

SKIP: {

    skip "Does not work like this on 5.9.5+", 1 if $] > 5.009_004;

    is(FFF3->testsub(), 'FFF3_first_in_dfs', 'dfs resolution pre-init');

}

Class::C3::initialize();

is(FFF3->testsub(), 'FFF3_first_in_c3', 'c3 resolution post-init');

mro::set_mro('FFF3', 'dfs');

is(mro::get_mro('FFF3'), 'dfs');

is_deeply(

  mro::get_linear_isa('FFF3'),

  [ 'FFF3', 'EEE3', 'BBB3', 'AAA3', 'CCC3', 'DDD3' ],

  "get_linear_isa for FFF3 (dfs)",

);

is(FFF3->testsub(), 'FFF3_first_in_dfs', 'dfs resolution post- set_mro dfs');

is_deeply(

  mro::get_linear_isa('GGG3'),

  [ 'GGG3', 'FFF3', 'EEE3', 'BBB3', 'CCC3', 'DDD3', 'AAA3' ],

  "get_linear_isa for GGG3 (still c3)",

);

mro::set_mro('FFF3', 'c3');

is(mro::get_mro('FFF3'), 'c3');

is_deeply(

  mro::get_linear_isa('FFF3'),

  [ 'FFF3', 'EEE3', 'BBB3', 'CCC3', 'DDD3', 'AAA3' ],

  "get_linear_isa for FFF3 (reset to c3 via set_mro)",

);

eval "package FFF3; use mro 'dfs'";

is(mro::get_mro('FFF3'), 'dfs');

is_deeply(

  mro::get_linear_isa('FFF3'),

  [ 'FFF3', 'EEE3', 'BBB3', 'AAA3', 'CCC3', 'DDD3' ],

  "get_linear_isa for FFF3 (reset to dfs via 'use mro')",

);