You can clone with
I logged it at rails 3.1 as well: rails/rails#1452
So I think this has to do with the before vs streaming starting and cookies and sessions being closed now. Anywhere I call to create a model in a request spec in a before block this error shows up. It was showing up for me with flash messages to until there was a patch in edge rails to fix it: rails/rails#290
This does not address the issue with cookies though. I am not sure if it is rspec or rails' issue so i'll let you guys work that out. I will tackle it this weekend to see which myself.
this is edge rspec2 rails + edge rails 3.1
This is the tracker for rspec-rails-1 - please repost to https://github.com/rspec/rspec-rails/issues.