def get_all(selector, separator)
      elements = @mechanize_page.search(selector)
      throw_if_empty(elements, "elements", selector)

      (elements.map &:text).join(separator)
    end
def get_all(selector, separator)
      elements = @mechanize_page.search(selector)
      throw_if_empty(elements, "elements", selector)

      (elements.map &:text).join(separator)
    end
String with the text of all matching elements, separated by separator.