Rails controller specs with Devise

authentication_macros.rb

# spec/support/macros/authentication_macros.rb
module AuthenticationMacros
  def sign_in_user
    let(:current_user) { Factory.stub(:user) }

    before do
      sign_in current_user
      warden.stub(:authenticate => current_user)
      warden.stub(:authenticate! => current_user)
    end
  end
end

configuration.rb

# spec/support/configuration.rb
RSpec.configure do |config|
  config.include Devise::TestHelpers, :type => :controller
  config.extend AuthenticationMacros, :type => :controller
end