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PhabricatorHashTestCase.php
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Fri, Jan 3, 14:05

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));
}
public function testHashForAnchor() {
$map = array(
// For inputs with no "." or "_" in the output, digesting for an index
// or an anchor should be the same.
'dog' => array(
'Aliif7Qjd5ct',
'Aliif7Qjd5ct',
),
// When an output would contain "." or "_", it should be replaced with
// an alphanumeric character in those positions instead.
'fig' => array(
'OpB9tY4i.MOX',
'OpB9tY4imMOX',
),
'cot' => array(
'_iF26XU_PsVY',
'3iF26XUkPsVY',
),
// The replacement characters are well-distributed and generally keep
// the entropy of the output high: here, "_" characters in the initial
// positions of the digests of "cot" (above) and "dug" (this test) have
// different outputs.
'dug' => array(
'_XuQnp0LUlUW',
'7XuQnp0LUlUW',
),
);
foreach ($map as $input => $expect) {
list($expect_index, $expect_anchor) = $expect;
$this->assertEqual(
$expect_index,
PhabricatorHash::digestForIndex($input),
pht('Index digest of "%s".', $input));
$this->assertEqual(
$expect_anchor,
PhabricatorHash::digestForAnchor($input),
pht('Anchor digest of "%s".', $input));
}
}
}

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