75 lines
2.8 KiB
PHP
75 lines
2.8 KiB
PHP
<?php
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namespace Faker\Test\Provider;
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use Faker\Provider\Biased;
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use Faker\Generator;
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use PHPUnit\Framework\TestCase;
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class BiasedTest extends TestCase
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{
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const MAX = 10;
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const NUMBERS = 25000;
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protected $generator;
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protected $results = array();
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protected function setUp()
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{
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$this->generator = new Generator();
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$this->generator->addProvider(new Biased($this->generator));
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$this->results = array_fill(1, self::MAX, 0);
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}
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public function performFake($function)
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{
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for($i = 0; $i < self::NUMBERS; $i++) {
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$this->results[$this->generator->biasedNumberBetween(1, self::MAX, $function)]++;
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}
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}
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public function testUnbiased()
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{
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$this->performFake(array('\Faker\Provider\Biased', 'unbiased'));
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// assert that all numbers are near the expected unbiased value
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foreach ($this->results as $number => $amount) {
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// integral
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$assumed = (1 / self::MAX * $number) - (1 / self::MAX * ($number - 1));
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// calculate the fraction of the whole area
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$assumed /= 1;
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$this->assertGreaterThan(self::NUMBERS * $assumed * .95, $amount, "Value was more than 5 percent under the expected value");
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$this->assertLessThan(self::NUMBERS * $assumed * 1.05, $amount, "Value was more than 5 percent over the expected value");
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}
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}
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public function testLinearHigh()
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{
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$this->performFake(array('\Faker\Provider\Biased', 'linearHigh'));
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foreach ($this->results as $number => $amount) {
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// integral
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$assumed = 0.5 * pow(1 / self::MAX * $number, 2) - 0.5 * pow(1 / self::MAX * ($number - 1), 2);
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// calculate the fraction of the whole area
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$assumed /= pow(1, 2) * .5;
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$this->assertGreaterThan(self::NUMBERS * $assumed * .9, $amount, "Value was more than 10 percent under the expected value");
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$this->assertLessThan(self::NUMBERS * $assumed * 1.1, $amount, "Value was more than 10 percent over the expected value");
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}
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}
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public function testLinearLow()
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{
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$this->performFake(array('\Faker\Provider\Biased', 'linearLow'));
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foreach ($this->results as $number => $amount) {
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// integral
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$assumed = -0.5 * pow(1 / self::MAX * $number, 2) - -0.5 * pow(1 / self::MAX * ($number - 1), 2);
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// shift the graph up
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$assumed += 1 / self::MAX;
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// calculate the fraction of the whole area
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$assumed /= pow(1, 2) * .5;
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$this->assertGreaterThan(self::NUMBERS * $assumed * .9, $amount, "Value was more than 10 percent under the expected value");
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$this->assertLessThan(self::NUMBERS * $assumed * 1.1, $amount, "Value was more than 10 percent over the expected value");
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}
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}
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}
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