public function test_grep_2()
{
// Destructive callback
$arr = array('snowball', 'snowcone', 'snowangel', 'igloo', 'ice');
Enumerator::grep_($arr, "/^snow/", function ($key, &$value) {
$value .= '_';
return;
});
$this->assertEquals(array('snowball_', 'snowcone_', 'snowangel_'), $arr);
}
