ruby-on-rails – 模拟XHR GET请求

xhr :get,:index

但总是会失败,因为测试试图加载show动作(没有任何参数)而不是指定的索引动作.

控制器动作是：

def index      
  @contacts = Contact.all

  respond_to do |format|
    format.html 
    format.js   { 
      render :update do |page|
        page.replace_html :contact_search_results,:partial => 'contacts'
      end
    }
  end
end

运行规范引发的错误是(显示：正在使用的show动作)：

ActionView::TemplateError in 'ContactsController as an administrator user when
showing the index of contacts' as an AJAX request should render results into the
contact_search_results element'

contact_url failed to generate from {:action=>"show",:controller=>"contacts",:id=>#<Contact id: nil,first_name: nil,....>}

有谁知道如何在测试中模拟AJAX调用索引操作？

谢谢！