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36 lines
1.2 KiB
PHP
36 lines
1.2 KiB
PHP
<?php
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declare(strict_types=1);
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namespace DNW\Skills\Tests\TrueSkill;
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use DNW\Skills\TrueSkill\DrawMargin;
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use DNW\Skills\Numerics\BasicMath;
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use DNW\Skills\Numerics\GaussianDistribution;
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use PHPUnit\Framework\TestCase;
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use PHPUnit\Framework\Attributes\CoversClass;
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use PHPUnit\Framework\Attributes\UsesClass;
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#[CoversClass(DrawMargin::class)]
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#[UsesClass(BasicMath::class)]
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#[UsesClass(GaussianDistribution::class)]
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final class DrawMarginTest extends TestCase
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{
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private const float ERROR_TOLERANCE = 0.000001;
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public function testGetDrawMarginFromDrawProbability(): void
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{
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$beta = 25.0 / 6.0;
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// The expected values were compared against Ralf Herbrich's implementation in F#
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$this->assertDrawMargin(0.10, $beta, 0.74046637542690541);
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$this->assertDrawMargin(0.25, $beta, 1.87760059883033);
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$this->assertDrawMargin(0.33, $beta, 2.5111010132487492);
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}
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private function assertDrawMargin(float $drawProbability, float $beta, float $expected): void
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{
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$actual = DrawMargin::getDrawMarginFromDrawProbability($drawProbability, $beta);
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$this->assertEqualsWithDelta($expected, $actual, self::ERROR_TOLERANCE);
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}
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}
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