59 lines
1.9 KiB
Java
59 lines
1.9 KiB
Java
/*
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* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import jdk.test.lib.RandomFactory;
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/**
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* @test
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* @summary Check that nextExponential() returns non-negative outcomes
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* @bug 8284866
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*
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* @key randomness
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* @library /test/lib
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* @build jdk.test.lib.RandomFactory
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* @run main RandomExponentialTest
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*/
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public class RandomExponentialTest {
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private static final int SAMPLES = 1_000_000_000;
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public static void main(String[] args) throws Exception {
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var errCount = 0;
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var errSample = Double.NaN;
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var random = RandomFactory.getRandom();
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for (int i = 0; i < SAMPLES; i++) {
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var expVal = random.nextExponential();
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if (!(expVal >= 0.0)) {
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errCount += 1;
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errSample = expVal;
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}
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}
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if (errCount > 0) {
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throw new RuntimeException("%d errors out of %d samples: e.g., %f"
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.formatted(errCount, SAMPLES, errSample));
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}
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}
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}
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