test/jdk/java/lang/StrictMath/Tests.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);
    }
}