ruby-on-rails – RSpec和受保护的方法,current_user的控制器规

我有这个application_controller_spec.rb

require "spec_helper"

describe ApplicationController do
  describe "current_user" do
    it "should return nil if no one is logged in" do
      subject.current_user.should be_nil
    end
    it "should return currently logged in user" do
      hash = {user_id: "my_id"}
      subject.should_receive(:session).and_return hash
      subject.current_user.should == "my_id"
    end
  end
end

没有受保护的关键字,它工作得很好.

application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery
  helper_method :current_user

  protected
  def current_user
    session[:user_id]
  end
end

与受保护启用,我得到这个错误msg

NoMethodError: protected method `current_user' called for #<ApplicationController:0x2a90888>

我应该能够使用helper_method来测试…任何建议？