test/jdk/java/util/Random/LXMRandomWithSeed.java - master - githubmirror/galahad

test/jdk/java/util/Random/LXMRandomWithSeed.java

51 строка2 KB

Raffaello Giulietti

8283083: java.util.random L128X256MixRandom constructor fails to use byte[] seed

12 апр 2022, 20:36

12 апр 2022, 20:3619b140a

/*
 * Copyright (c) 2022, 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 java.util.random.RandomGeneratorFactory;

/**
 * @test
 * @summary Check that the (byte[]) constructors do not throw (see bug report)
 * @bug 8283083
 */

public class LXMRandomWithSeed {

    public static void main(String[] args) {
        byte[] seed = new byte[0x100];
        for (var i = 0; i < seed.length; ++i) {
            seed[i] = (byte) i;
        }
        var lxmFactories = RandomGeneratorFactory.all()
                .filter(factory -> factory.group().equals("LXM"))
                .toList();
        for (var lxmFactory : lxmFactories) {
            var lxmGen0 = lxmFactory.create(seed);
            var lxmGen1 = lxmFactory.create(seed);
            if (lxmGen0.nextLong() != lxmGen1.nextLong()) {
                throw new RuntimeException("%s(byte[]) is incorrect".formatted(lxmFactory.name()));
            }
        }
    }

}