1 files changed, 9 insertions, 0 deletions
diff --git a/actionpack/test/controller/cookie_test.rb b/actionpack/test/controller/cookie_test.rb
index 2b5b1cae9f..3f9dafacd6 100644
--- a/actionpack/test/controller/cookie_test.rb
+++ b/actionpack/test/controller/cookie_test.rb
@@ -28,6 +28,10 @@ class CookieTest < Test::Unit::TestCase
       render_text "hello world"
     end
 
+    def access_frozen_cookies
+      @cookies["wont"] = "work"
+    end
+
     def rescue_action(e) raise end
   end
 
@@ -63,6 +67,11 @@ class CookieTest < Test::Unit::TestCase
     assert_equal 2, process_request.headers["cookie"].size
   end
 
+  def test_setting_cookie_on_frozen_instance_variable
+    @request.action = "access_frozen_cookies"
+    assert_raises(TypeError) { process_request }
+  end
+
   private
     def process_request
       TestController.process(@request, @response)