Quelle Tests.java Sprache: JAVA

/*
* Copyright (c) 2003, 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.function.DoubleBinaryOperator;
import java.util.function.DoubleUnaryOperator;

/*
* Shared static test method for StrictMath tests.
*/

public class Tests {
    private Tests(){}

    public static int test(String testName,
                           double input,
                           DoubleUnaryOperator func,
                           double expected) {
        return test(testName, input, func.applyAsDouble(input), expected);
    }

    public static int test(String testName,
                           double input,
                           double result,
                           double expected) {
        if (Double.compare(expected, result ) != 0) {
            System.err.println("Failure for " + testName + ":\n" +
                               "\tFor input "   + input    + "\t(" + Double.toHexString(input) + ")\n" +
                               "\texpected " + expected + "\t(" + Double.toHexString(expected) + ")\n" +
                               "\tgot " + result   + "\t(" + Double.toHexString(result) + ").");
            return 1;
        } else {
            return 0;
        }
    }

    public static int test(String testName,
                           double input1,
                           double input2,
                           DoubleBinaryOperator func,
                           double expected) {
        return test(testName, input1, input2, func.applyAsDouble(input1, input2), expected);
    }

    public static int test(String testName, double input1, double input2,
                           double result, double expected) {
        if (Double.compare(expected, result ) != 0) {
            System.err.println("Failure for " + testName + ":\n" +
                               "\tFor input "   + input1   + "\t(" + Double.toHexString(input1) + "), " +
                                                + input2   + "\t(" + Double.toHexString(input2) + ")\n" +
                               "\texpected " + expected + "\t(" + Double.toHexString(expected) + ")\n" +
                               "\tgot " + result   + "\t(" + Double.toHexString(result) + ").");
            return 1;
        } else {
            return 0;
        }
    }

    /**
     * Returns a double over the normalized range of floating-point values.
     * @return a double over the normalized range of floating-point values
     */
    static double createRandomDouble(java.util.Random random) {
        final int EXPONENT_RANGE = Double.MAX_EXPONENT - Double.MIN_EXPONENT + 1;

        int targetExponent = Double.MIN_EXPONENT + random.nextInt(EXPONENT_RANGE + 1);
        double tmp = random.nextDouble(); // Double in the range of [0.0, 1.0)
        int tmpExponent = Math.getExponent(tmp);
        return Math.scalb(tmp, targetExponent - tmpExponent);
    }
}

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