diff -r 4ebc2e2fb97c -r 71c04702a3d5 test/jdk/java/io/charStreams/WriteLengths.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/io/charStreams/WriteLengths.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2001, 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
+ * @bug 4429227
+ * @summary Ensure that OutputStreamWriter works on whole multiples
+ *          of its internal buffer size
+ */
+
+import java.io.*;
+
+
+public class WriteLengths {
+
+    static PrintStream log = System.err;
+    static int failures = 0;
+
+    static ByteArrayOutputStream bos = new ByteArrayOutputStream(1 << 15);
+
+    static void go(int len, String enc) throws Exception {
+        bos.reset();
+        OutputStreamWriter osw = new OutputStreamWriter(bos, enc);
+        char[] cs = new char[len];
+        osw.write(cs);
+        osw.close();
+        byte[] ba = bos.toByteArray();
+        if (ba.length != len) {
+            log.println("FAIL: Wrote " + len + ", got " + ba.length
+                        + "; enc = " + enc);
+            failures++;
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        for (int i = 0; i < (1 << 15); i += 1024)
+            go(i, "us-ascii");
+    }
+
+}