--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/test/native/utilities/test_utf8.cpp	Wed Aug 24 19:21:20 2016 +0300
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#include "precompiled.hpp"
+#include "utilities/utf8.hpp"
+#include "unittest.hpp"
+
+TEST(utf8, length) {
+  char res[60];
+  jchar str[20];
+
+  for (int i = 0; i < 20; i++) {
+    str[i] = 0x0800; // char that is 2B in UTF-16 but 3B in UTF-8
+  }
+  str[19] = (jchar) '\0';
+
+  // The resulting string in UTF-8 is 3*19 bytes long, but should be truncated
+  UNICODE::as_utf8(str, 19, res, 10);
+  ASSERT_EQ(strlen(res), (size_t) 9) << "string should be truncated here";
+
+  UNICODE::as_utf8(str, 19, res, 18);
+  ASSERT_EQ(strlen(res), (size_t) 15) << "string should be truncated here";
+
+  UNICODE::as_utf8(str, 19, res, 20);
+  ASSERT_EQ(strlen(res), (size_t) 18) << "string should be truncated here";
+
+  // Test with an "unbounded" buffer
+  UNICODE::as_utf8(str, 19, res, INT_MAX);
+  ASSERT_EQ(strlen(res), (size_t) 3 * 19) << "string should end here";
+}