def should_be_enabled(element_id)
      if page.has_xpath?("//*[@id='#{element_id}']")
        if page.has_xpath?("//*[@id='#{element_id}' and @disabled]")
          raise Kelp::Unexpected,
            "Expected element with id='#{element_id}' to be enabled," + \
            " but the 'disabled' attribute is present."
        end
      else
        raise Kelp::Unexpected,
          "Element with id='#{element_id}' not found."
      end
    end
def should_be_enabled(element_id)
      if page.has_xpath?("//*[@id='#{element_id}']")
        if page.has_xpath?("//*[@id='#{element_id}' and @disabled]")
          raise Kelp::Unexpected,
            "Expected element with id='#{element_id}' to be enabled," + \
            " but the 'disabled' attribute is present."
        end
      else
        raise Kelp::Unexpected,
          "Element with id='#{element_id}' not found."
      end
    end
Verify that the HTML element with the given ID exists, and is enabled (does
 not have the `disabled` attribute).

 @param [String] element_id
   HTML `id` attribute of the element that should be enabled

 @raise [Kelp::Unexpected]
   If the given element id is not found, or the element is not enabled