php-ml/tests/Phpml/Math/Distance/EuclideanTest.php

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<?php
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declare(strict_types=1);
namespace tests\Phpml\Metric;
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use Phpml\Math\Distance\Euclidean;
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use PHPUnit\Framework\TestCase;
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class EuclideanTest extends TestCase
{
/**
* @var Euclidean
*/
private $distanceMetric;
public function setUp()
{
$this->distanceMetric = new Euclidean();
}
/**
* @expectedException \Phpml\Exception\InvalidArgumentException
*/
public function testThrowExceptionOnInvalidArguments()
{
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$a = [0, 1, 2];
$b = [0, 2];
$this->distanceMetric->distance($a, $b);
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}
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public function testCalculateDistanceForOneDimension()
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{
$a = [4];
$b = [2];
$expectedDistance = 2;
$actualDistance = $this->distanceMetric->distance($a, $b);
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$this->assertEquals($expectedDistance, $actualDistance);
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}
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public function testCalculateDistanceForTwoDimensions()
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{
$a = [4, 6];
$b = [2, 5];
$expectedDistance = 2.2360679774998;
$actualDistance = $this->distanceMetric->distance($a, $b);
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$this->assertEquals($expectedDistance, $actualDistance);
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}
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public function testCalculateDistanceForThreeDimensions()
{
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$a = [6, 10, 3];
$b = [2, 5, 5];
$expectedDistance = 6.7082039324993694;
$actualDistance = $this->distanceMetric->distance($a, $b);
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$this->assertEquals($expectedDistance, $actualDistance);
}
}