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),
			pht('Input: %s', $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),
			pht('Distinct characters in hash of: %s', $input));
			}

			}

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