Add a plugin to handle session persistence. This is based on the

plugin at http://github.com/augustl/session-persistence but modified
to work with rails 2 rather than rails 3.

vendor/plugins/session-persistence/test/session_timeout_test.rb

@@ -0,0 +1,41 @@
+require "test/unit"
+
+module ActionController
+  class Base
+    def self.after_filter(*args)
+      
+    end
+  end
+end
+
+$LOAD_PATH.push(File.dirname(__FILE__) + "../lib")
+require "../init"
+
+class SessionPersistenceTest < Test::Unit::TestCase
+  def setup
+    @controller = ActionController::Base.new
+    @controller.instance_eval {
+      def session
+        @session ||= {}
+      end
+      
+      def session_persistence_key
+        :mine
+      end
+    }
+  end
+  
+  def test_session_expires_after
+    @controller.instance_eval { session_expires_after 10 }
+    assert_equal 10, @controller.session[:mine]
+  end
+  
+  def test_session_expires_automatically
+    @controller.instance_eval {
+      session_expires_after 10
+      session_expires_automatically
+    }
+    
+    assert !@controller.session.has_key?(:mine)
+  end
+end