--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/net/httpclient/whitebox/jdk.incubator.httpclient/jdk/incubator/http/AbstractRandomTest.java	Wed Dec 06 14:29:06 2017 +0000
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2017, 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 jdk.incubator.http;
+
+import java.util.Random;
+
+/** Abstract supertype for tests that need random numbers within a given range. */
+public class AbstractRandomTest {
+
+    private static Long getSystemSeed() {
+        Long seed = null;
+        try {
+            // note that Long.valueOf(null) also throws a NumberFormatException
+            // so if the property is undefined this will still work correctly
+            seed = Long.valueOf(System.getProperty("seed"));
+        } catch (NumberFormatException e) {
+            // do nothing: seed is still null
+        }
+        return seed;
+    }
+
+    private static long getSeed() {
+        Long seed = getSystemSeed();
+        if (seed == null) {
+            seed = (new Random()).nextLong();
+        }
+        System.out.println("Seed from AbstractRandomTest.getSeed = "+seed+"L");
+        return seed;
+    }
+
+    private static Random random = new Random(getSeed());
+
+    protected static int randomRange(int lower, int upper) {
+        if (lower > upper)
+            throw new IllegalArgumentException("lower > upper");
+        int diff = upper - lower;
+        int r = lower + random.nextInt(diff);
+        return r - (r % 8); // round down to multiple of 8 (align for longs)
+    }
+}