diff --git a/tests/lib/convert/utf85_test.dart b/tests/lib/convert/utf85_test.dart
new file mode 100644
index 00000000000..3b5edc0528c
--- /dev/null
+++ b/tests/lib/convert/utf85_test.dart
@@ -0,0 +1,15 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+library utf8_test;
+import "package:expect/expect.dart";
+import 'dart:convert';
+
+main() {
+   for (int i = 0; i <= 0x10FFFF; i++) {
+     if (i == UNICODE_BOM_CHARACTER_RUNE) continue;
+     Expect.equals(i,
+        UTF8.decode(UTF8.encode(new String.fromCharCode(i))).runes.first);
+   }
+}