public function testGetRank()
{
$this->rediska->addToSortedSet('test', 123, 1);
$this->rediska->addToSortedSet('test', 456, 2);
$this->rediska->addToSortedSet('test', 789, 3);
$rank = $this->set->getRank(456);
$this->assertEquals(1, $rank);
}