1 files changed, 19 insertions, 1 deletions
diff --git a/actionpack/test/dispatch/session/cookie_store_test.rb b/actionpack/test/dispatch/session/cookie_store_test.rb
index f0e01bfff0..3864821ef0 100644
--- a/actionpack/test/dispatch/session/cookie_store_test.rb
+++ b/actionpack/test/dispatch/session/cookie_store_test.rb
@@ -44,7 +44,12 @@ class CookieStoreTest < ActionController::IntegrationTest
       session[:foo] = 'bye!' * 1024
       head :ok
     end
-    
+
+    def change_session_id
+      request.session_options[:id] = nil
+      get_session_id
+    end
+
     def rescue_action(e) raise end
   end
 
@@ -212,6 +217,19 @@ class CookieStoreTest < ActionController::IntegrationTest
     end
   end
 
+  def test_setting_session_id_to_nil_is_respected
+    with_test_route_set do
+      cookies[SessionKey] = SignedBar
+
+      get "/get_session_id"
+      sid = response.body
+      assert_equal sid.size, 36
+
+      get "/change_session_id"
+      assert_not_equal sid, response.body
+    end
+  end
+
   def test_session_store_with_expire_after
     with_test_route_set(:expire_after => 5.hours) do
       # First request accesses the session