t/107_C3MethodDispatchOrder_test.t

   1 #!/usr/bin/perl
   2
   3 use strict;
   4 use warnings;
   5
   6 use Test::More;
   7 use File::Spec;
   8
   9 BEGIN {
  10     eval "use Algorithm::C3";
  11     plan skip_all => "Algorithm::C3 required for this test" if $@;
  12     plan tests => 5;
  13
  14     use_ok('Class::MOP');
  15     require_ok(File::Spec->catfile('examples', 'C3MethodDispatchOrder.pod'));
  16 }
  17
  18 {
  19     package Diamond_A;
  20     use metaclass 'C3MethodDispatchOrder';
  21
  22     sub hello { 'Diamond_A::hello' }
  23
  24     package Diamond_B;
  25     use metaclass 'C3MethodDispatchOrder';
  26     __PACKAGE__->meta->superclasses('Diamond_A');
  27
  28     package Diamond_C;
  29     use metaclass 'C3MethodDispatchOrder';
  30     __PACKAGE__->meta->superclasses('Diamond_A');
  31
  32     sub hello { 'Diamond_C::hello' }
  33
  34     package Diamond_D;
  35     use metaclass 'C3MethodDispatchOrder';
  36     __PACKAGE__->meta->superclasses('Diamond_B', 'Diamond_C');
  37 }
  38
  39 is_deeply(
  40     [ Diamond_D->meta->class_precedence_list ],
  41     [ qw(Diamond_D Diamond_B Diamond_C Diamond_A) ],
  42     '... got the right MRO for Diamond_D');
  43
  44 is(Diamond_D->hello, 'Diamond_C::hello', '... got the right dispatch order');
  45 is(Diamond_D->can('hello')->(), 'Diamond_C::hello', '... can(method) resolved itself as expected');
  46
  47