access.rb

def self.playlist_id
  SystemConfiguration.youtube.playlist.id
end

# or

config.api_key = SystemConfiguration.airbrake.api_key

# or

GOOGLE_ANALYTICS_TRACKING_ID = SystemConfiguration.google_analytics.tracking_id

awesome_spec.rb

SystemConfiguration.stub_chain(:youtube, :playlist, :id) { '1234' }

fedora.rb

require 'fedora/connection'
config_file = Rails.root.join('config', 'fedora.yml').to_s
if not File.exist?(config_file)
  raise "You need a config/fedora.yml file. Try starting with config/fedora.example.yml if you need a sample to start from."
end
configuration = HashWithIndifferentAccess.new(YAML.load_file(config_file))[Rails.env]
Fedora.connect!(configuration)

system_configuration.rb

class SystemConfiguration < Settingslogic
  source "#{Rails.root}/config/system_config.yml"
  namespace Rails.env
end