Trouble testing for page element

I'm trying to use Luke Redpath's hpricot_test_helper plugin to test for the existence of a page element in my integration test. I get errors like "nil.content_for" for even when using examples copied directly from his tutorial which indicate that the @output variable in hpricot_test_helper is coming up nil:

  def tag(css_query)     @output.content_for(css_query)   end

I thought the plugin be configured to receive html output upon installation via hpricot. Am I mistaken?

Also, are people still using this? At 18th months old it's somewhat dated by rails standards. Is there something later and greater I should be using?