gem management of rails version specific code

gistfile1.rb

####
## super_gem.rb
module SuperGem
  require 'super_gem/rails/patches'

  # super stuff you couldn't even imagine ...
end


####
## super_gem/rails/patches.rb
case Rails.version.to_f
when 3.0  
  if Rails.env.test?
    require 'super_gem/test_stuff_3_0'
  end
  
  require 'super_gem/active_record_patch_3_0' 

when 3.1  
  if Rails.env.test?
    require 'super_gem/test_stuff_3_1'
  end
  
  require 'super_gem/active_record_patch_3_1' 
end