Test should fail !

A couple of suggestions.

* Does the test fail if you run it alone from the command line (outside of rake)
$ cd my_app
$ ruby test/functional/alerts_controller_test

* Output the http response in the body of the test and see what is
actually getting returned.
def test_get_index
  get :index
  puts @response.body # (maybe this is response.body?)
  assert_response :success

* Are you rendering any partials within the index template? There is
(or at least was) a nasty bug in the compiling of partials which can
lead to them working only in a certain order.