use strict; use warnings; use Test::More; use Test::Fatal; { package Dog; use Moose::Role; sub talk { 'woof' } has fur => ( isa => "Str", is => "rw", default => "dirty", ); package Foo; use Moose; has 'dog' => ( is => 'rw', does => 'Dog', ); } my $obj = Foo->new; isa_ok($obj, 'Foo'); ok(!$obj->can( 'talk' ), "... the role is not composed yet"); ok(!$obj->can( 'fur' ), 'ditto'); ok(!$obj->does('Dog'), '... we do not do any roles yet'); isnt( exception { $obj->dog($obj) }, undef, '... and setting the accessor fails (not a Dog yet)' ); Dog->meta->apply($obj); ok($obj->does('Dog'), '... we now do the Bark role'); ok($obj->can('talk'), "... the role is now composed at the object level"); ok($obj->can('fur'), "it has fur"); is($obj->talk, 'woof', '... got the right return value for the newly composed method'); is( exception { $obj->dog($obj) }, undef, '... and setting the accessor is okay' ); is($obj->fur, "dirty", "role attr initialized"); done_testing;