A test case to ensure that AC::Metal#response_body= always wraps the given value in an Array in both Ruby 1.8 and 1.9 (refs #3581)

actionpack/test/controller/new_base/bare_metal_test.rb

@@ -23,6 +23,12 @@ class BareTest < ActiveSupport::TestCase
 
       assert_equal "Hello world", string
     end
+
+    test "response_body value is wrapped in an array when the value is a String" do
+      controller = BareController.new
+      controller.index
+      assert_equal ["Hello world"], controller.response_body
+    end
   end
 
   class HeadController < ActionController::Metal