--- /dev/null	2019-02-07 20:54:51.336000000 +0300
+++ new/test/lib/jdk/test/lib/jfr/EventVerifier.java	2019-02-08 18:34:11.966822050 +0300
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2013, 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 jdk.jfr.consumer.RecordedEvent;
+
+public abstract class EventVerifier {
+    protected final RecordedEvent event;
+
+    public EventVerifier(RecordedEvent event) {
+        this.event = event;
+    }
+
+    public <T extends Comparable<T>> void verifyEquals(String name, T value) {
+        Events.assertField(event, name).equal(value);
+    }
+
+    public void verifyContains(String name, String value) {
+        Events.assertField(event, name).containsAny(value);
+    }
+
+    protected long gigabytes(int num) {
+        return num * 1024L * 1024L * 1024L;
+    }
+
+    protected long megabytes(int num) {
+        return num * 1024L * 1024L;
+    }
+
+    public abstract void verify() throws Exception;
+}