phpOMS/tests/Math/Functions/FunctionsTest.php

<?php
/**
 * Orange Management
 *
 * PHP Version 7.4
 *
 * @package   tests
 * @copyright Dennis Eichhorn
 * @license   OMS License 1.0
 * @version   1.0.0
 * @link      https://orange-management.org
 */
declare(strict_types=1);

namespace phpOMS\tests\Math\Functions;

use phpOMS\Math\Functions\Functions;

/**
 * @internal
 */
class FunctionsTest extends \PHPUnit\Framework\TestCase
{
    public function testFactorial() : void
    {
        self::assertEquals(120, Functions::fact(5));
        self::assertEquals(39916800, Functions::fact(11));
    }

    public function testBinomialCoefficient() : void
    {
        self::assertEquals(21, Functions::binomialCoefficient(7, 2));
        self::assertEquals(6, Functions::binomialCoefficient(4, 2));
        self::assertEquals(13983816, Functions::binomialCoefficient(49, 6));
    }

    public function testAckermann() : void
    {
        self::assertEquals(5, Functions::ackermann(2, 1));
        self::assertEquals(125, Functions::ackermann(3, 4));
        self::assertEquals(5, Functions::ackermann(0, 4));
        self::assertEquals(13, Functions::ackermann(4, 0));
    }

    public function testMultiplicativeInverseModulo() : void
    {
        self::assertEquals(4, Functions::invMod(3, -11));
        self::assertEquals(12, Functions::invMod(10, 17));
        self::assertEquals(5, Functions::invMod(-10, 17));
    }

    public function testOdd() : void
    {
        self::assertTrue(Functions::isOdd(3));
        self::assertTrue(Functions::isOdd(-3));
        self::assertFalse(Functions::isOdd(4));
        self::assertFalse(Functions::isOdd(-4));
    }

    public function testEven() : void
    {
        self::assertTrue(Functions::isEven(4));
        self::assertTrue(Functions::isEven(-4));
        self::assertFalse(Functions::isEven(3));
        self::assertFalse(Functions::isEven(-3));
    }

    public function testCircularPosition() : void
    {
        self::assertEquals(0, Functions::getRelativeDegree(7, 12, 7));
        self::assertEquals(5, Functions::getRelativeDegree(12, 12, 7));
        self::assertEquals(11, Functions::getRelativeDegree(6, 12, 7));
    }
}