--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/sound/midi/Devices/MidiOutGetMicrosecondPositionBug.java	Mon Oct 31 14:50:09 2016 +0300
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) 2003, 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.
+ */
+
+import javax.sound.midi.MidiDevice;
+import javax.sound.midi.MidiSystem;
+import javax.sound.midi.Sequencer;
+import javax.sound.midi.Synthesizer;
+
+/**
+ * @test
+ * @bug 4903786
+ * @summary MIDI OUT does not implement getMicrosecondPosition() consistently
+ */
+public class MidiOutGetMicrosecondPositionBug {
+    static int successfulTests = 0;
+
+    private static void testDevice(MidiDevice device) throws Exception {
+        boolean timestampsAvailable = false;
+        boolean timestampPrecisionOk = false;
+        try {
+            // expected behaviour if not opened?
+            device.open();
+            /* First, we're testing if timestamps are provided at all.
+               Returning -1 (unsupported), while allowed by the API
+               specification, is not sufficient to pass this test. */
+            long timestamp = device.getMicrosecondPosition();
+            timestampsAvailable = (timestamp != -1);
+
+            /* Then, we're testing the precision. Note that the system time
+               is measured in milliseconds, while the device time is measured
+               in microseconds. */
+
+            long systemTime1 = System.currentTimeMillis();
+            long deviceTime1 = device.getMicrosecondPosition();
+            // rest for 5 seconds
+            Thread.sleep(5000);
+            long systemTime2 = System.currentTimeMillis();
+            long deviceTime2 = device.getMicrosecondPosition();
+
+            // now both period measurements are calculated in milliseconds.
+            long systemDuration = systemTime2 - systemTime1;
+            long deviceDuration = (deviceTime2 - deviceTime1) / 1000;
+            long delta = Math.abs(systemDuration - deviceDuration);
+            // a deviation of 0.5 seconds (= 500 ms) is allowed.
+            timestampPrecisionOk = (delta <= 500);
+        } catch (Throwable t) {
+            System.out.println("  - Caught exception. Not failed.");
+            System.out.println("  - " + t.toString());
+            return;
+        } finally {
+            device.close();
+        }
+        if (! timestampsAvailable) {
+            throw new Exception("timestamps are not supported");
+        }
+        if (! timestampPrecisionOk) {
+            throw new Exception("device timer not precise enough");
+        }
+        successfulTests++;
+    }
+
+    private static void doAll() throws Exception {
+        MidiDevice.Info[] infos = MidiSystem.getMidiDeviceInfo();
+        for (int i=0; i < infos.length; i++) {
+            MidiDevice device = MidiSystem.getMidiDevice(infos[i]);
+            if ((! (device instanceof Sequencer)) &&
+                (! (device instanceof Synthesizer)) &&
+                (device.getMaxReceivers() > 0 || device.getMaxReceivers() == -1)) {
+
+                System.out.println("--------------");
+                System.out.println("Testing MIDI device: " + infos[i]);
+                testDevice(device);
+            }
+            if (infos.length==0) {
+                System.out.println("No MIDI devices available!");
+            }
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        if (!isMidiInstalled()) {
+            return;
+        }
+        doAll();
+        if (successfulTests==0) {
+            System.out.println("Could not execute any of the tests. Test NOT failed.");
+        } else {
+            System.out.println("Test PASSED.");
+        }
+    }
+
+    /**
+     * Returns true if at least one MIDI (port) device is correctly installed on
+     * the system.
+     */
+    public static boolean isMidiInstalled() {
+        boolean result = false;
+        MidiDevice.Info[] devices = MidiSystem.getMidiDeviceInfo();
+        for (int i = 0; i < devices.length; i++) {
+            try {
+                MidiDevice device = MidiSystem.getMidiDevice(devices[i]);
+                result = ! (device instanceof Sequencer) && ! (device instanceof Synthesizer);
+            } catch (Exception e1) {
+                System.err.println(e1);
+            }
+            if (result)
+                break;
+        }
+        if (!result) {
+            System.err.println("Soundcard does not exist or sound drivers not installed!");
+            System.err.println("This test requires sound drivers for execution.");
+        }
+        return result;
+    }
+}