module Devise::TestHelpers

def self.included(base) 

def self.included(base)
  base.class_eval do
    setup :setup_controller_for_warden, :warden if respond_to?(:setup)
  end
end

def setup_controller_for_warden #:nodoc:

:nodoc:
We need to setup the environment variables and the response in the controller. 
def setup_controller_for_warden #:nodoc:
  @request.env['action_controller.rescue.request']  = @request
  @request.env['action_controller.rescue.response'] = @response
  @request.env['rack.session'] = session
  @controller.response = @response
end

def sign_in(resource_or_scope, resource=nil)


sign_in @user # sign_in(resource)
sign_in :user, @user # sign_in(scope, resource)

Examples:

sign_in a given resource by storing its keys in the session. 
def sign_in(resource_or_scope, resource=nil)
  scope    ||= Devise::Mapping.find_scope!(resource_or_scope)
  resource ||= resource_or_scope
  warden.session_serializer.store(resource, scope)
end

def sign_out(resource_or_scope)


sign_out @user # sign_out(resource)
sign_out :user # sign_out(scope)

Examples:

Sign out a given resource or scope by calling logout on Warden. 
def sign_out(resource_or_scope)
  scope = Devise::Mapping.find_scope!(resource_or_scope)
  @controller.instance_variable_set(:"@current_#{scope}", nil)
  warden.logout(scope)
end

def warden #:nodoc:

:nodoc:
Quick access to Warden::Proxy. 
def warden #:nodoc:
  @warden ||= (@request.env['warden'] = TestWarden.new(@controller))
end