rspec/rspec-rails — pull request #655 by atambo (2012-12-14 03:34:54+00:00)
Title: Automatically include superclass helpers into view specs

Rails includes all classes inherited from AbstractController as
helpers in views. This patch will just include the superclass
which is closer to correct but doesn't go all the way up the
inheritance chain.

Here is what rails does:

https://github.com/rails/rails/blob/master/actionpack/lib/abstract_controller/helpers.rb#L19