test "if there is no user in session,redirect to index and flash message" do
  open_session do |sess|
    post '/login',:email => users(:client).email,:password => 'rumpelstiltskin'
    sess[:user] = nil
    get '/user_page'
    assert_redirected_to index_path
    assert_equal "Your session has expired. Please log in again",flash[:notice]
  end    
end

这会产生错误：undefined method'[] =’@H_301_5@

而且,更改为sess.session [：user] = nil也会生成错误：NoMethodError：未定义的方法“session”为nil：NilClass@H_301_5@

如何从Rails中的集成测试修改会话参数？@H_301_5@

在Rails 3.0.7中工作,Ruby 1.9.2p180,单元测试框架.@H_301_5@

编辑：
get’/ user_page’,nil,{：user => nil}和get(‘/ user_page’,{：user => nil})生成错误.@H_301_5@