--- /dev/null	2018-06-17 23:18:20.806999507 +0800
+++ new/test/jdk/jfr/event/gc/detailed/TestG1HeapRegionTypeChangeEvent.java	2019-01-29 11:03:09.860424150 +0800
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2016, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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 jdk.jfr.event.gc.detailed;
+
+import java.nio.file.Paths;
+import java.time.Duration;
+import java.util.List;
+
+import jdk.jfr.Recording;
+import jdk.jfr.consumer.RecordedEvent;
+import jdk.testlibrary.Asserts;
+import jdk.testlibrary.jfr.EventNames;
+import jdk.testlibrary.jfr.Events;
+import jdk.testlibrary.jfr.GCHelper;
+
+/*
+ * @test
+ * @bug 8149650
+ * @requires vm.gc == "G1" | vm.gc == null
+ * @key jfr
+ * @library /lib/testlibrary
+ * @run main/othervm -XX:NewSize=2m -XX:MaxNewSize=2m -Xmx32m -XX:G1HeapRegionSize=1m -XX:+UseG1GC jdk.jfr.event.gc.detailed.TestG1HeapRegionTypeChangeEvent
+ */
+
+public class TestG1HeapRegionTypeChangeEvent {
+    private final static String EVENT_NAME = EventNames.G1HeapRegionTypeChange;
+
+    public static void main(String[] args) throws Exception {
+        Recording recording = null;
+        try {
+            recording = new Recording();
+            // activate the event we are interested in and start recording
+            recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(0));
+            recording.start();
+
+            // Setting NewSize and MaxNewSize will limit eden, so
+            // allocating 1024 20k byte arrays should trigger at
+            // least a few Young GCs.
+            byte[][] array = new byte[1024][];
+            for (int i = 0; i < array.length; i++) {
+                array[i] = new byte[20 * 1024];
+            }
+            recording.stop();
+
+            // Verify recording
+            List<RecordedEvent> events = Events.fromRecording(recording);
+            Asserts.assertFalse(events.isEmpty(), "No events found");
+
+            for (RecordedEvent event : events) {
+                Events.assertField(event, "index").notEqual(-1);
+                Asserts.assertTrue(GCHelper.isValidG1HeapRegionType(Events.assertField(event, "from").getValue()));
+                Asserts.assertTrue(GCHelper.isValidG1HeapRegionType(Events.assertField(event, "to").getValue()));
+                Events.assertField(event, "used").atMost(1L*1024*1024);
+            }
+        } catch (Throwable t) {
+            if (recording != null) {
+                recording.dump(Paths.get("TestG1HeapRegionTypeChangeEvent.jfr"));
+            }
+            throw t;
+        } finally {
+            if (recording != null) {
+                recording.close();
+            }
+        }
+    }
+}