run-time role composition test (failing)

diff --git a/lib/Moose/Meta/Role.pm b/lib/Moose/Meta/Role.pm
index 7082f7b..3343dbd 100644 (file)
--- a/lib/Moose/Meta/Role.pm
+++ b/lib/Moose/Meta/Role.pm
@@ -318,6 +318,9 @@ sub _apply_methods {
 sub apply {
     my ($self, $other) = @_;
     
+    ($other->isa('Moose::Meta::Class') || $other->isa('Moose::Meta::Role'))
+        || confess "You must apply a role to a metaclass, not ($other)";
+    
     $self->_check_excluded_roles($other);
     $self->_check_required_methods($other);  
 

diff --git a/t/049_run_time_role_composition.t b/t/049_run_time_role_composition.t
new file mode 100644 (file)
index 0000000..83da531
--- /dev/null
+++ b/t/049_run_time_role_composition.t
@@ -0,0 +1,82 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use Test::More tests => 1;
+
+use Scalar::Util qw(blessed);
+
+BEGIN {
+    use_ok('Moose');
+}
+
+=pod
+
+This test can be used as a basis for the runtime role composition.
+Apparently it is not as simple as just making an anon class. One of 
+the problems is the way that anon classes are DESTROY-ed, which is
+not very compatible with how instances are dealt with.
+
+{
+    package Bark;
+    use Moose::Role;
+
+    sub talk { 'woof' }
+
+    package Sleeper;
+    use Moose::Role;
+
+    sub sleep { 'snore' }
+    sub talk { 'zzz' }
+
+    package My::Class;
+    use Moose;
+
+    sub sleep { 'nite-nite' }
+}
+
+my $obj = My::Class->new;
+ok(!$obj->can( 'talk' ), "... the role is not composed yet");
+
+
+{
+    isa_ok($obj, 'My::Class');    
+    
+    ok(!$obj->does('Bark'), '... we do not do any roles yet');
+    
+    Bark->meta->apply($obj);
+
+    ok($obj->does('Bark'), '... we now do the Bark role');
+    ok(!My::Class->does('Bark'), '... the class does not do the Bark role');    
+
+    isa_ok($obj, 'My::Class');
+    isnt(blessed($obj), 'My::Class', '... but it is not longer blessed into My::Class');
+
+    ok(!My::Class->can('talk'), "... the role is not composed at the class level");
+    ok($obj->can('talk'), "... the role is now composed at the object level");
+    
+    is($obj->talk, 'woof', '... got the right return value for the newly composed method');
+}
+
+{
+    is($obj->sleep, 'nite-nite', '... the original method responds as expected');
+
+    ok(!$obj->does('Bark'), '... we do not do the Sleeper role');
+
+    Sleeper->meta->apply($obj);
+
+    ok($obj->does('Bark'), '... we still do the Bark role');
+    ok($obj->does('Sleeper'), '... we now do the Sleeper role too');   
+    
+    ok(!My::Class->does('Sleeper'), '... the class does not do the Sleeper role');         
+    
+    isa_ok($obj, 'My::Class');
+
+    is(My::Class->sleep, 'nite-nite', '... the original method still responds as expected');
+
+    is($obj->sleep, 'snore', '... got the right return value for the newly composed method');
+    is($obj->talk, 'zzz', '... got the right return value for the newly composed method');    
+}
+
+=cut