class DeviseController

def assert_is_devise_resource! #:nodoc:
  unknown_action! <<-MESSAGE unless devise_mapping
uld not find devise mapping for path #{request.fullpath.inspect}.
is may happen for two reasons:
 You forgot to wrap your route inside the scope block. For example:
devise_scope :user do
  get "/some/route" => "some_devise_controller"
end
 You are testing a Devise controller bypassing the router.
 If so, you can explicitly tell Devise which mapping to use:
 @request.env["devise.mapping"] = Devise.mappings[:user]
SSAGE
end