sign_in user如果设计不适用于rspec

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我想出了这段代码：

config.include FactoryGirl::Syntax::Methods
config.include Devise::Test::ControllerHelpers, type: :controller
config.include Devise::Controllers::UrlHelpers
config.include Warden::Test::Helpers

并在控制器规范中：

before(:each) do
 sign_in user
 get :index
end

it "should have a current_user" do
 expect(subject.current_user).to_not eq(nil)
end

但subject.current_user即将成为零。我想知道为什么会这样。