Mocking warden in controller specs

spec_helper.rb

module RandomHelpers
  def random_number() SecureRandom.random_number(10000); end
  def random_id() random_number; end
  def random_name() SecureRandom.hex(20); end
end

module ControllerHelpers
  def user_double(attrs = {})
    user_attrs = {
      :first_name => random_name,
      :last_name => random_name,
      :authenticatable_salt => 'x'
    }.merge(attrs)
    mock_model(User, user_attrs)
  end

  def stub_sign_in_with(user)
    request.env['warden'] = double(Warden,
                                   :authenticate => user,
                                   :authenticate! => user,
                                   :authenticate? => true)
    sign_in(user)
    return user
  end

  def stub_sign_in(attrs = {})
    stub_sign_in_with user_double(attrs)
  end
end

RSpec.configure do |config|
  config.include RandomHelpers
  config.include Devise::TestHelpers, :type => :controller
  config.include ControllerHelpers, :type => :controller
end