public function testDiff()
{
$this->rediska->addToSet('test', 123);
$this->rediska->addToSet('test', 456);
$this->rediska->addToSet('test2', 456);
$values = $this->set->diff('test2');
$this->assertEquals(array(123), $values);
$values = $this->set->diff(new Rediska_Key_Set('test2'));
$this->assertEquals(array(123), $values);
$values = $this->set->diff(array('test2'));
$this->assertEquals(array(123), $values);
}