--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/net/SocketImpl/java.base/java/net/PlatformSocketImpl.java	Thu May 30 07:19:19 2019 +0100
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2019, 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.
+ */
+
+package java.net;
+
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.io.IOException;
+import java.util.Set;
+
+/**
+ * A SocketImpl that delegates all operations to a platform SocketImpl. It also
+ * overrides all methods with public methods and implements AutoCloseable to make
+ * it easy to write tests.
+ */
+
+public class PlatformSocketImpl extends SocketImpl implements AutoCloseable {
+    private final SocketImpl impl;
+
+    public PlatformSocketImpl(boolean server) {
+        impl = new sun.nio.ch.NioSocketImpl(server);
+    }
+
+    @Override
+    public void close() throws IOException {
+        impl.close();
+    }
+
+    @Override
+    public void create(boolean stream) throws IOException {
+        impl.create(stream);
+    }
+
+    @Override
+    public void connect(SocketAddress remote, int millis) throws IOException {
+        impl.connect(remote, millis);
+    }
+
+    @Override
+    public void connect(String host, int port) throws IOException {
+        impl.connect(host, port);
+    }
+
+    @Override
+    public void connect(InetAddress address, int port) throws IOException {
+        impl.connect(address, port);
+    }
+
+    @Override
+    public void bind(InetAddress address, int port) throws IOException {
+        impl.bind(address, port);
+    }
+
+    @Override
+    public void listen(int backlog) throws IOException {
+        impl.listen(backlog);
+    }
+
+    @Override
+    public void accept(SocketImpl si) throws IOException {
+        impl.accept(((PlatformSocketImpl) si).impl);
+    }
+
+    @Override
+    public InputStream getInputStream() throws IOException {
+        return impl.getInputStream();
+    }
+
+    @Override
+    public OutputStream getOutputStream() throws IOException {
+        return impl.getOutputStream();
+    }
+
+    @Override
+    public int available() throws IOException {
+        return impl.available();
+    }
+
+    @Override
+    public Set<SocketOption<?>> supportedOptions() {
+        return impl.supportedOptions();
+    }
+
+    @Override
+    public <T> void setOption(SocketOption<T> opt, T value) throws IOException {
+        impl.setOption(opt, value);
+    }
+
+    @Override
+    public <T> T getOption(SocketOption<T> opt) throws IOException {
+        return impl.getOption(opt);
+    }
+
+    @Override
+    public void setOption(int opt, Object value) throws SocketException {
+        impl.setOption(opt, value);
+    }
+
+    @Override
+    public Object getOption(int opt) throws SocketException {
+       return impl.getOption(opt);
+    }
+
+    @Override
+    public void shutdownInput() throws IOException {
+       impl.shutdownInput();
+    }
+
+    @Override
+    public void shutdownOutput() throws IOException {
+        impl.shutdownOutput();
+    }
+
+    @Override
+    public boolean supportsUrgentData() {
+        return impl.supportsUrgentData();
+    }
+
+    @Override
+    public void sendUrgentData(int data) throws IOException {
+        impl.sendUrgentData(data);
+    }
+}