At least this week I had some time to spent in ending a litte small project: adapt and improve the cache_test plugin to Rails 2.x. You can find it at GitHub: cache_test.

Cache test is a very useful plugin that allows you to test if action/fragment/page cache is generated or expired during a request. For me is very surprisingly that Rails hasn't asserts for testing the cache, specially when, if your application uses cache, it can be the cause of its malfunctioning. Apart of that cache is so tedious to debug.

The way it works is very easy:

     assert_cache_fragment({:fragment => 'total_posts'}) do
       get :index, :user_id => users(:first)
       assert_response :success
     end

In my plugin I have adapted the cache storage definition to Rails 2.x (moved to ActiveSupport, etc), added more asserts and some tests.

Enjoy it!

More info in the README.