--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/lib/jdk/test/lib/jfr/SimpleEventHelper.java	Tue May 15 20:24:34 2018 +0200
@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2018, 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.test.lib.jfr;
+
+import java.time.Duration;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+import jdk.jfr.Recording;
+import jdk.jfr.consumer.RecordedEvent;
+import jdk.test.lib.Asserts;
+
+public class SimpleEventHelper {
+
+    public static void enable(Recording r, boolean isEnabled) {
+        if (isEnabled) {
+            r.enable(SimpleEvent.class).withThreshold(Duration.ofMillis(0)).withoutStackTrace();
+        } else {
+            r.disable(SimpleEvent.class);
+        }
+    }
+
+    public static SimpleEvent createEvent(int id) {
+        SimpleEvent event = new SimpleEvent();
+        event.begin();
+        event.id = id;
+        event.end();
+        event.commit();
+        return event;
+    }
+
+    public static void verifyEvents(Recording r, int ... ids) throws Exception {
+        List<Integer> eventIds = new ArrayList<>();
+        for (RecordedEvent event : Events.fromRecording(r)) {
+            if (Events.isEventType(event, SimpleEvent.class.getName())) {
+                int id = Events.assertField(event, "id").getValue();
+                System.out.printf("recording %s: event.id=%d%n", r.getName(), id);
+                eventIds.add(id);
+            }
+        }
+        Asserts.assertEquals(eventIds.size(), ids.length, "Wrong number of events");
+        for (int i = 0; i < ids.length; ++i) {
+            Asserts.assertEquals(eventIds.get(i).intValue(), ids[i], "Wrong id in event");
+        }
+    }
+
+    public static void verifyContains(List<RecordedEvent> events, int ... ids) throws Exception {
+        Set<Integer> missingIds = new HashSet<>();
+        for (int id : ids) {
+            missingIds.add(id);
+        }
+        for (RecordedEvent event : getSimpleEvents(events)) {
+            int id = Events.assertField(event, "id").getValue();
+            System.out.printf("event.id=%d%n", id);
+            missingIds.remove(new Integer(id));
+        }
+        if (!missingIds.isEmpty()) {
+            missingIds.forEach(id -> System.out.println("Missing MyEvent with id " + id));
+            Asserts.fail("Missing some MyEvent events");
+        }
+    }
+
+    public static void verifyNotContains(List<RecordedEvent> events, int ... ids) throws Exception {
+        for (RecordedEvent event : getSimpleEvents(events)) {
+            int eventId = Events.assertField(event, "id").getValue();
+            System.out.printf("event.id=%d%n", eventId);
+            for (int id : ids) {
+                Events.assertField(event, "id").notEqual(id);
+            }
+        }
+    }
+
+    public static List<RecordedEvent> getSimpleEvents(List<RecordedEvent> events) {
+        List<RecordedEvent> myEvents = new ArrayList<>();
+        for (RecordedEvent event : events) {
+            if (Events.isEventType(event, SimpleEvent.class.getName())) {
+                myEvents.add(event);
+            }
+        }
+        return myEvents;
+    }
+}