eagerly allocate the renderer object

this means the reader doesn't need to lock, but does have the added cost
of a new object created for every controller

1 files changed, 4 insertions, 0 deletions

diff --git a/actionpack/test/controller/renderer_test.rb b/actionpack/test/controller/renderer_test.rb
index b55a25430b..1a273adec4 100644
--- a/actionpack/test/controller/renderer_test.rb
+++ b/actionpack/test/controller/renderer_test.rb
@@ -1,6 +1,10 @@
 require 'abstract_unit'
 
 class RendererTest < ActiveSupport::TestCase
+  test 'action controller base has a renderer' do
+    assert ActionController::Base.renderer
+  end
+
   test 'creating with a controller' do
     controller = CommentsController
     renderer   = ActionController::Renderer.for controller