1 files changed, 111 insertions, 0 deletions
diff --git a/t/roles/run_time_role_composition.t b/t/roles/run_time_role_composition.t
new file mode 100644
index 0000000..c847df3
--- /dev/null
+++ b/t/roles/run_time_role_composition.t
@@ -0,0 +1,111 @@
+use strict;
+use warnings;
+
+use Test::More;
+
+use Scalar::Util qw(blessed);
+
+
+=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.
+
+=cut
+
+{
+    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 $obj = My::Class->new;
+isa_ok($obj, 'My::Class');
+
+my $obj2 = My::Class->new;
+isa_ok($obj2, 'My::Class');
+
+{
+    ok(!$obj->can( 'talk' ), "... the role is not composed yet");
+
+    ok(!$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 no 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');
+}
+
+{
+    ok(!$obj2->does('Sleeper'), '... we do not do any roles yet');
+
+    Sleeper->meta->apply($obj2);
+
+    ok($obj2->does('Sleeper'), '... we now do the Sleeper role');
+    isnt(blessed($obj), blessed($obj2), '... they DO NOT share the same anon-class/role thing');
+}
+
+{
+    is($obj->sleep, 'nite-nite', '... the original method responds as expected');
+
+    ok(!$obj->does('Sleeper'), '... we do not do the Sleeper role');
+
+    Sleeper->meta->apply($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');
+
+    isnt(blessed($obj), blessed($obj2), '... they still don\'t share the same anon-class/role thing');
+
+    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($obj->talk, 'zzz', '... got the right return value for the newly composed method');
+}
+
+{
+    ok(!$obj2->does('Bark'), '... we do not do Bark yet');
+
+    Bark->meta->apply($obj2);
+
+    ok($obj2->does('Bark'), '... we now do the Bark role');
+    isnt(blessed($obj), blessed($obj2), '... they still don\'t share the same anon-class/role thing');
+}
+
+# test that anon classes are equivalent after role composition in the same order
+{
+    foreach ($obj, $obj2) {
+        $_ = My::Class->new;
+        Bark->meta->apply($_);
+        Sleeper->meta->apply($_);
+    }
+    is(blessed($obj), blessed($obj2), '... they now share the same anon-class/role thing');
+}
+
+done_testing;