--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/sun/nio/cs/FindASCIICodingBugs.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2008, 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 6196991
+ * @summary Roundtrip Encoding/Decoding of just one ASCII char
+ * @author Martin Buchholz
+ */
+
+import java.util.*;
+import java.nio.*;
+import java.nio.charset.*;
+
+public class FindASCIICodingBugs {
+    private static int failures = 0;
+
+    private static void check(boolean condition) {
+        if (! condition) {
+            new Error("test failed").printStackTrace();
+            failures++;
+        }
+    }
+
+    private static boolean equals(byte[] ba, ByteBuffer bb) {
+        if (ba.length != bb.limit())
+            return false;
+        for (int i = 0; i < ba.length; i++)
+            if (ba[i] != bb.get(i))
+                return false;
+        return true;
+    }
+
+    public static void main(String[] args) throws Exception {
+        for (Map.Entry<String,Charset> e
+                 : Charset.availableCharsets().entrySet()) {
+            String csn = e.getKey();
+            Charset cs = e.getValue();
+
+            // Delete the following lines when these charsets are fixed!
+            if (csn.equals("x-JIS0208"))      continue; // MalformedInput
+            if (csn.equals("JIS_X0212-1990")) continue; // MalformedInput
+
+            if (! cs.canEncode()) continue;
+
+            CharsetEncoder enc = cs.newEncoder();
+            CharsetDecoder dec = cs.newDecoder();
+
+            if (! enc.canEncode('A')) continue;
+
+            System.out.println(csn);
+
+            try {
+                byte[] bytes1 = "A".getBytes(csn);
+                ByteBuffer bb = enc.encode(CharBuffer.wrap(new char[]{'A'}));
+
+                check(equals(bytes1, bb));
+                check(new String(bytes1, csn).equals("A"));
+
+                CharBuffer cb = dec.decode(bb);
+                check(cb.toString().equals("A"));
+            } catch (Throwable t) {
+                t.printStackTrace();
+                failures++;
+            }
+        }
+
+        if (failures > 0)
+            throw new Exception(failures + "tests failed");
+    }
+}