php-ml/tests/Math/Statistic/MeanTest.php
2018-10-28 07:44:52 +01:00

60 lines
1.5 KiB
PHP

<?php
declare(strict_types=1);
namespace Phpml\Tests\Math\Statistic;
use Phpml\Exception\InvalidArgumentException;
use Phpml\Math\Statistic\Mean;
use PHPUnit\Framework\TestCase;
class MeanTest extends TestCase
{
public function testArithmeticThrowExceptionOnEmptyArray(): void
{
$this->expectException(InvalidArgumentException::class);
Mean::arithmetic([]);
}
public function testArithmeticMean(): void
{
$delta = 0.01;
self::assertEquals(3.5, Mean::arithmetic([2, 5]), '', $delta);
self::assertEquals(41.16, Mean::arithmetic([43, 21, 25, 42, 57, 59]), '', $delta);
self::assertEquals(1.7, Mean::arithmetic([0.5, 0.5, 1.5, 2.5, 3.5]), '', $delta);
}
public function testMedianThrowExceptionOnEmptyArray(): void
{
$this->expectException(InvalidArgumentException::class);
Mean::median([]);
}
public function testMedianOnOddLengthArray(): void
{
$numbers = [5, 2, 6, 1, 3];
self::assertEquals(3, Mean::median($numbers));
}
public function testMedianOnEvenLengthArray(): void
{
$numbers = [5, 2, 6, 1, 3, 4];
self::assertEquals(3.5, Mean::median($numbers));
}
public function testModeThrowExceptionOnEmptyArray(): void
{
$this->expectException(InvalidArgumentException::class);
Mean::mode([]);
}
public function testModeOnArray(): void
{
$numbers = [5, 2, 6, 1, 3, 4, 6, 6, 5];
self::assertEquals(6, Mean::mode($numbers));
}
}