--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/lang/Character/TestUndefinedTitleCase.java	Mon Feb 05 11:12:09 2018 +0800
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2018, 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.
+ */
+
+/*
+ * @test
+ * @author John O'Conner
+ * @bug 4453730
+ * @summary Undefined character code points do not have titlecase mappings. The
+ *          toTitleCase method should return the argument code value.
+ */
+public class TestUndefinedTitleCase {
+    static int endCharValue = 0xFFFF;
+
+    public static void main(String[] args) {
+        for(int ch=0x0000; ch <= endCharValue; ch++) {
+            if (!Character.isDefined((char)ch) && Character.toTitleCase((char)ch) != (char)ch) {
+                throw new RuntimeException("Char value " + Integer.toHexString((char)ch));
+            }
+        }
+        System.out.println("Passed");
+    }
+}