public function testSamplesFairlyWithDefaultCallback()
{
$mockReq = $this->getMockBuilder('WebRequest')->disableOriginalConstructor()->getMock();
$mockReq->expects($this->any())->method('getIP')->will($this->returnCallback(function () {
return mt_rand();
}));
$mockReq->expects($this->any())->method('getHeader')->will($this->returnCallback(function () {
return mt_rand();
}));
\RequestContext::getMain()->setRequest($mockReq);
$config = $this->config('test', 3);
$samples = 3000;
$expected = $samples / $config['test']['sampleRate'];
$expectedPerBucket = $expected / count($config['test']['buckets']);
$allowedError = 0.25;
$buckets = array();
for ($i = 0; $i < $samples; ++$i) {
$ut = new UserTesting($config);
if ($ut->isParticipatingIn('test')) {
$bucket = $ut->getBucket('test');
if (isset($buckets[$bucket])) {
$buckets[$bucket]++;
} else {
$buckets[$bucket] = 1;
}
}
}
unset($buckets['']);
$participants = array_sum($buckets);
$this->assertGreaterThan($expected * (1 - $allowedError), $participants);
$this->assertLessThan($expected * (1 + $allowedError), $participants);
foreach ($buckets as $bucket => $participants) {
$this->assertGreaterThan($expectedPerBucket * (1 - $allowedError), $participants);
$this->assertLessThan($expectedPerBucket * (1 + $allowedError), $participants);
}
}
