File: tests/full/DieHardTest.php

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File: tests/full/DieHardTest.php
Role: Class source
Content type: text/plain
Description: Class source
Class: random_compat
Provide random_bytes and random_int functions
Author: By
Last change:
Date: 2 years ago
Size: 2,153 bytes
 

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<?php
class DieHardTest extends PHPUnit_Framework_TestCase
{
   
/**
     * Birthday spacings: Choose random points on a large interval.
     * The spacings between the points should be asymptotically exponentially
     * distributed.
     */
   
public function testBirthday()
    {
       
// Number of buckets to make
       
$num_buckets = 17;
       
// How much tolerance should we allow? 0.01 = 1% 0.50 = 50%, etc.
       
$tolerance = 0.03;
       
$rand_min = 200000;
       
$rand_max = 600000;
       
$rand_step = 100000;
       
       
$minT = (1.00 - $tolerance);
       
$maxT = (1.00 + $tolerance);
       
        for (
$nums_to_generate = $rand_min; $nums_to_generate < $rand_max; $nums_to_generate += $rand_step) {
           
$buckets = array_fill(0, $num_buckets, 0);

           
// The number of ints we expect per bucket +/- 2%;
           
$min = (int) ceil($minT * $nums_to_generate / $num_buckets);
           
$max = (int) floor($maxT * $nums_to_generate / $num_buckets);

            for (
$i = 0; $i < $nums_to_generate; ++$i) {
               
$random = random_int(0, 999);
               
$bucket = $random % $num_buckets;
               
$buckets[$bucket]++;
            }
            for (
$i = 0; $i < $num_buckets; ++$i) {
               
               
// Debugging code:
               
               
if ($buckets[$i] <= $min ) {
                   
var_dump([
                       
'bucket' => $i,
                       
'value' => $buckets[$i],
                       
'min' => $min,
                       
'nums' => $nums_to_generate,
                       
'reason' => 'below min'
                   
]);
                }
                if (
$buckets[$i] >= $max ) {
                   
var_dump([
                       
'bucket' => $i,
                       
'value' => $buckets[$i],
                       
'maax' => $max,
                       
'nums' => $nums_to_generate,
                       
'reason' => 'above max'
                   
]);
                }
               
               
$this->assertTrue($buckets[$i] < $max && $buckets[$i] > $min);
            }
        }
    }
}


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