check_validity!

# File activemodel/lib/active_model/validations/length.rb, line 22
      def check_validity!
        keys = CHECKS.keys & options.keys

        if keys.empty?
          raise ArgumentError, "Range unspecified. Specify the :in, :within, :maximum, :minimum, or :is option."
        end

        keys.each do |key|
          value = options[key]

          unless (value.is_a?(Integer) && value >= 0) || value == Float::INFINITY
            raise ArgumentError, ":#{key} must be a nonnegative Integer or Infinity"
          end
        end
      end