def search!(path, node = doc)
      node.search(path) or raise Error::NodeNotFound, "node for `#{path}` not found"
    end
def search!(path, node = doc)
      node.search(path) or raise Error::NodeNotFound, "node for `#{path}` not found"
    end
+node.search(path) or raise error
 @param [String] path XPath or CSS path
 @return [Array<Nokogiri::XML::Node>]