+# -*- coding: utf-8 -*-
+require 'test_helper'
+
+class UTF8Test < ActiveSupport::TestCase
+ def test_valid?
+ assert_equal true, UTF8.valid?("test")
+ assert_equal true, UTF8.valid?("vergrößern")
+ assert_equal true, UTF8.valid?("ルシステムにも対応します")
+ assert_equal true, UTF8.valid?("輕觸搖晃的遊戲")
+
+ assert_equal false, UTF8.valid?("\xC0") # always invalid utf8
+ assert_equal false, UTF8.valid?("\xC2\x4a") # 2-byte multibyte identifier, followed by plain ASCII
+ assert_equal false, UTF8.valid?("\xC2\xC2") # 2-byte multibyte identifier, followed by another one
+ assert_equal false, UTF8.valid?("\x4a\x82") # plain ASCII, followed by multibyte continuation
+ assert_equal false, UTF8.valid?("\x82\x82") # multibyte continuations without multibyte identifier
+ assert_equal false, UTF8.valid?("\xe1\x82\x4a") # three-byte identifier, contination and (incorrectly) plain ASCII
+ end
+end