gistfile1.rb

def new_list_item_link
    content_for :action_links do
      link_to "New #{controller.controller_name.humanize.titleize.singularize}", eval("new_managed_lists_#{controller.controller_name.singularize}_path")
    end
end

describe "#new_list_item_link" do
    before do
      helper.should_receive(:new_managed_lists_test_path).and_return 'test_path_url'
      helper.new_list_item_link
    end
    it "should add a link to action_links" do
      helper.content_for(:action_links).should have_selector("a[@href=test_path_url]")
    end
  end

#OUTPUT
NameError: undefined local variable or method `new_managed_lists_test_path' for #<#<Class:0xb23f630>:0xb3b1fa4>