PhabricatorHashTestCase.php
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	<?php

	final class PhabricatorHashTestCase extends PhabricatorTestCase {

	public function testHashForIndex() {
	$map = array(
	'dog' => 'Aliif7Qjd5ct',
	'cat' => 'toudDsue3Uv8',
	'rat' => 'RswaKgTjqOuj',
	'bat' => 'rAkJKyX4YdYm',
	);

	foreach ($map as $input => $expect) {
	$this->assertEqual(
	$expect,
	PhabricatorHash::digestForIndex($input),
	"Input: {$input}");
	}

	// Test that the encoding produces 6 bits of entropy per byte.
	$entropy = array(
	'dog', 'cat', 'rat', 'bat', 'dig', 'fig', 'cot',
	'cut', 'fog', 'rig', 'rug', 'dug', 'mat', 'pat',
	'eat', 'tar', 'pot',
	);

	$seen = array();
	foreach ($entropy as $input) {
	$chars = preg_split('//', PhabricatorHash::digestForIndex($input));
	foreach ($chars as $char) {
	$seen[$char] = true;
	}
	}

	$this->assertEqual(
	(1 << 6),
	count($seen),
	"Distinct characters in hash of: {$input}");
	}

	}