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Current File : /var/www/vhosts/oinversion.com/httpdocs/vendor/fzaninotto/faker/test/Faker/Provider/BiasedTest.php

<?php
namespace Faker\Test\Provider;

use Faker\Provider\Biased;
use Faker\Generator;

class BiasedTest extends \PHPUnit_Framework_TestCase
{
    const MAX = 10;
    const NUMBERS = 25000;
    protected $generator;
    protected $results = array();
    
    protected function setUp()
    {
        $this->generator = new Generator();
        $this->generator->addProvider(new Biased($this->generator));

        $this->results = array_fill(1, self::MAX, 0);
    }
    
    public function performFake($function)
    {
        for($i = 0; $i < self::NUMBERS; $i++) {
            $this->results[$this->generator->biasedNumberBetween(1, self::MAX, $function)]++;
        }
    }
    
    public function testUnbiased()
    {
        $this->performFake(array('\Faker\Provider\Biased', 'unbiased'));

        // assert that all numbers are near the expected unbiased value
        foreach ($this->results as $number => $amount) {
            // integral
            $assumed = (1 / self::MAX * $number) - (1 / self::MAX * ($number - 1));
            // calculate the fraction of the whole area
            $assumed /= 1;
            $this->assertGreaterThan(self::NUMBERS * $assumed * .95, $amount, "Value was more than 5 percent under the expected value");
            $this->assertLessThan(self::NUMBERS * $assumed * 1.05, $amount, "Value was more than 5 percent over the expected value");
        }
    }
    
    public function testLinearHigh()
    {
        $this->performFake(array('\Faker\Provider\Biased', 'linearHigh'));

        foreach ($this->results as $number => $amount) {
            // integral
            $assumed = 0.5 * pow(1 / self::MAX * $number, 2) - 0.5 * pow(1 / self::MAX * ($number - 1), 2);
            // calculate the fraction of the whole area
            $assumed /= pow(1, 2) * .5;
            $this->assertGreaterThan(self::NUMBERS * $assumed * .9, $amount, "Value was more than 10 percent under the expected value");
            $this->assertLessThan(self::NUMBERS * $assumed * 1.1, $amount, "Value was more than 10 percent over the expected value");
        }
    }
    
    public function testLinearLow()
    {
        $this->performFake(array('\Faker\Provider\Biased', 'linearLow'));

        foreach ($this->results as $number => $amount) {
            // integral
            $assumed = -0.5 * pow(1 / self::MAX * $number, 2) - -0.5 * pow(1 / self::MAX * ($number - 1), 2);
            // shift the graph up
            $assumed += 1 / self::MAX;
            // calculate the fraction of the whole area
            $assumed /= pow(1, 2) * .5;
            $this->assertGreaterThan(self::NUMBERS * $assumed * .9, $amount, "Value was more than 10 percent under the expected value");
            $this->assertLessThan(self::NUMBERS * $assumed * 1.1, $amount, "Value was more than 10 percent over the expected value");
        }
    }
}

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