Include acceptance helper methods into request specs

AcceptanceHelper.rb

module AcceptanceHelper
  def sign_in(user=Factory.create(:user))
    visit new_user_session_path
    fill_in 'user_email',    :with => user.email
    fill_in 'user_password', :with => user.password
    click_button 'Sign in'
  end
end

RSpec.configure do |config|
  config.include AcceptanceHelper, :type => :request
end