--- a/hotspot/src/share/vm/utilities/internalVMTests.cpp	Wed Aug 24 18:10:09 2016 +0300
+++ b/hotspot/src/share/vm/utilities/internalVMTests.cpp	Wed Aug 24 19:21:20 2016 +0300
@@ -60,7 +60,6 @@
   run_unit_test(TestOldSize_test);
   run_unit_test(TestKlass_test);
   run_unit_test(TestBitMap_test);
-  run_unit_test(TestAsUtf8);
   run_unit_test(TestResourcehash_test);
   run_unit_test(ObjectMonitor_test);
   run_unit_test(Test_linked_list);

--- a/hotspot/src/share/vm/utilities/utf8.cpp	Wed Aug 24 18:10:09 2016 +0300
+++ b/hotspot/src/share/vm/utilities/utf8.cpp	Wed Aug 24 19:21:20 2016 +0300
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 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
@@ -547,30 +547,3 @@
 template int UNICODE::quoted_ascii_length<jchar>(jchar* base, int length);
 template void UNICODE::as_quoted_ascii<jbyte>(const jbyte* base, int length, char* buf, int buflen);
 template void UNICODE::as_quoted_ascii<jchar>(const jchar* base, int length, char* buf, int buflen);
-
-
-#ifndef PRODUCT
-void TestAsUtf8() {
-  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(strlen(res) == 9, "string should be truncated here");
-
-  UNICODE::as_utf8(str, 19, res, 18);
-  assert(strlen(res) == 15, "string should be truncated here");
-
-  UNICODE::as_utf8(str, 19, res, 20);
-  assert(strlen(res) == 18, "string should be truncated here");
-
-  // Test with an "unbounded" buffer
-  UNICODE::as_utf8(str, 19, res, INT_MAX);
-  assert(strlen(res) == 3*19, "string should end here");
-}
-#endif

--- /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";
+}