Rails - Apr 2006 - Cookies and functional tests

Hi there

Is there any way that my functional tests can check to see if the 
controller has set a cookie?

I''ve got this in a controller action;

   def login
     cookies[:foo] = ''bar''
   end

Using a web browser, I can see that the cookie is being set when the 
action is invoked. But, a functional test like this;

   def test_cookie
       assert_equal nil, cookies[:foo]

       post :login, :user => {
           :name => users(:david).name,
           :password => users(:david).password,
       }

       assert_equal ''bar'', cookies[:foo]
   end

Fails, saying that cookies[:foo] is <nil>.

Is there anything I can do to have meaningful functional testing of 
cookies that are set by my controllers?

Thanks in advance

David