test/jdk/java/lang/Math/SinCosTests.java

/*
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 * 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.
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 */

/*
 * @test
 * @library /test/lib
 * @build Tests
 * @run main SinCosTests
 * @bug 8302040
 * @summary Tests for {Math, StrictMath}.sqrt
 */

public class SinCosTests {
    private SinCosTests(){}

    public static void main(String... argv) {
        int failures = 0;

        failures += testSin();
        failures += testCos();

        if (failures > 0) {
            System.err.println("Testing sin and cos incurred "
                               + failures + " failures.");
            throw new RuntimeException();
        }
    }

    private static final double InfinityD = Double.POSITIVE_INFINITY;
    private static final double NaNd      = Double.NaN;

    /**
     * "Special cases:
     *
     * If the argument is NaN or an infinity, then the result is NaN.
     *
     * If the argument is zero, then the result is a zero with the
     * same sign as the argument."
     */
    private static int testSin() {
        int failures = 0;

        for(double nan : Tests.NaNs) {
            failures += testSinCase(nan, NaNd);
        }

        double [][] testCases = {
            {+InfinityD,  NaNd},
            {-InfinityD,  NaNd},

            {+0.0,        +0.0},
            {-0.0,        -0.0},

        };

        for(int i = 0; i < testCases.length; i++) {
            failures += testSinCase(testCases[i][0], testCases[i][1]);
        }

        return failures;
    }

    /**
     * "Special cases:
     *
     * If the argument is NaN or an infinity, then the result is NaN.
     * If the argument is zero, then the result is 1.0."
     */
    private static int testCos() {
        int failures = 0;

        for(double nan : Tests.NaNs) {
            failures += testCosCase(nan, NaNd);
        }

        double [][] testCases = {
            {+InfinityD,  NaNd},
            {-InfinityD,  NaNd},

            {+0.0,        +1.0},
            {-0.0,        +1.0},

        };

        for(int i = 0; i < testCases.length; i++) {
            failures += testCosCase(testCases[i][0], testCases[i][1]);
        }

        return failures;
    }

    private static int testSinCase(double input, double expected) {
        int failures=0;

        failures+=Tests.test("Math.sin",        input, Math::sin,        expected);
        failures+=Tests.test("StrictMath.sin",  input, StrictMath::sin,  expected);

        return failures;
    }

    private static int testCosCase(double input, double expected) {
        int failures=0;

        failures+=Tests.test("Math.cos",        input, Math::cos,        expected);
        failures+=Tests.test("StrictMath.cos",  input, StrictMath::cos,  expected);

        return failures;
    }
}