+ ##
+ # takes a block which is executed in the context of a different
+ # ActionController instance. this is used so that code can call methods
+ # on the node controller whilst testing the old_node controller.
+ def with_controller(new_controller)
+ controller_save = @controller
+ begin
+ @controller = new_controller
+ yield
+ ensure
+ @controller = controller_save
+ end
+ end
+