Easy faking of user authentication in RSpec when using Devise

authentication_helpers.rb

module AuthenticationHelpers
  # Example usage: login mock_user(Editor)
  def login(user)
    request.env['warden'] = mock(Warden,
                                 :authenticate => user,
                                 :authenticate! => user)
  end
  
  def mock_user(type, stubs={})
    mock_model(type, stubs).as_null_object
  end
end