test/jdk/java/lang/Math/Ieee754SpecialCaseTests.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 8240632
 * @summary Test special cases of IEEE 754 recommended ops not otherwise tested
 * @build Tests
 * @build Ieee754SpecialCaseTests
 * @run main Ieee754SpecialCaseTests
 */

public class Ieee754SpecialCaseTests {
    private Ieee754SpecialCaseTests() {throw new AssertionError("No instances for you.");}

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

        failures += testSpecialCos();
        failures += testSpecialAcos();
        failures += testSpecialAtan();
        failures += testSpecialLog();

        if (failures > 0) {
            System.err.printf("Testing special cases incurred %d failures.%n", failures);
            throw new RuntimeException();
        }
    }
    private static int testSpecialCos() {
        int failures = 0;
        double [][] testCases = {
            {+0.0,    1.0},
            {-0.0,    1.0},
        };

        for(double[] testCase: testCases) {
            failures += testCosCase(testCase[0], testCase[1]);
        }

        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;
    }

    private static int testSpecialAcos() {
        int failures = 0;
        double [][] testCases = {
            {1.0,    0.0},
        };

        for(double[] testCase: testCases) {
            failures += testAcosCase(testCase[0], testCase[1]);
        }

        return failures;
    }

    private static int testAcosCase(double input, double expected) {
        int failures = 0;
        failures += Tests.test("Math.acos",       input, Math::acos,       expected);
        failures += Tests.test("StrictMath.acos", input, StrictMath::acos, expected);
        return failures;
    }

    private static int testSpecialAtan() {
        int failures = 0;
        double [][] testCases = {
            {Double.POSITIVE_INFINITY,    +Math.PI/2.0},
            {Double.NEGATIVE_INFINITY,    -Math.PI/2.0},
        };

        for(double[] testCase: testCases) {
            failures += testAtanCase(testCase[0], testCase[1]);
        }

        return failures;
    }

    private static int testAtanCase(double input, double expected) {
        int failures = 0;
        failures += Tests.test("Math.atan",       input, Math::atan,       expected);
        failures += Tests.test("StrictMath.atan", input, StrictMath::atan, expected);
        return failures;
    }

    private static int testSpecialLog() {
        int failures = 0;
        double [][] testCases = {
            {1.0,    +0.0},
        };

        for(double[] testCase: testCases) {
            failures += testLogCase(testCase[0], testCase[1]);
        }

        return failures;
    }

    private static int testLogCase(double input, double expected) {
        int failures = 0;
        failures += Tests.test("Math.log",       input, Math::log,       expected);
        failures += Tests.test("StrictMath.log", input, StrictMath::log, expected);
        return failures;
    }
}