Capybara无法测试删除链接

Question

我正在尝试写一个测试而且我真的很难过。 我正在使用帮助器来呈现链接

module DeleteLinksHelper
  def link_to_destroy(object)
    opts = {
      method: :delete,
      remote: true,
      id: "#{object.class.name.downcase}-#{object.id}-delete" 
       ### have tried with and without giving it an id
    }

     link_to object, opts do
       content_tag(:span, nil , class: "glyphicon glyphicon-remove")
     end
  end
end

当我运行服务器时，这一切都正常，它会删除我提供的对象。当我尝试用capybara编写集成测试时，问题就出现了。

Capybara.current_driver = Capybara.javascript_driver = :webkit

  # Have tried many ways of selecting/clicking the link and span elements
  page.find('span.glyphicon-remove').click
  page.find("#component-#{c.id}-delete > span").click

Capybara::Webkit::ClickFailed: Failed to find position for element /html/body/div/div[@id='main']/div[1]/div[2]/div[@id='components-pane']/ul/li[@id='component497695656']/div/a[@id='component-497695656-delete']/span

我刚刚保存了页面，它有完整的html页面。

<a id="component-497695656-delete" data-remote="true" rel="nofollow" data-method="delete" href="/components/497695656">
     <span class="glyphicon glyphicon-remove"></span>
</a>

但是如果我同时保存屏幕截图，它只会显示页脚。

呀！这就是整个屏幕截图！这里发生了什么？它与webkit驱动程序有关吗？