Test to_model being called in ActiveModel::Naming helpers

Signed-off-by: José Valim <jose.valim@gmail.com>

activemodel/test/cases/naming_test.rb

@@ -125,6 +125,10 @@ class NamingHelpersTest < Test::Unit::TestCase
     @param_key = 'contact'
   end
 
+  def test_to_model_called_on_record
+    assert_equal 'post_named_track_backs', plural(Post::TrackBack.new)
+  end
+
   def test_singular
     assert_equal @singular, singular(@record)
   end

activemodel/test/models/track_back.rb

@@ -1,4 +1,11 @@
 class Post
   class TrackBack
+    def to_model
+      NamedTrackBack.new(self)
+    end
+  end
+
+  class NamedTrackBack
+    extend ActiveModel::Naming
   end
 end