public function testSkipReset()
{
$pipeline = new Pipeline($this->collection);
$pipeline->skip(11)->match(array('a' => 1, 'b' => array('$lt' => 12)))->skip(23);
$this->assertEquals('[{"$skip":11},{"$match":{"a":1,"b":{"$lt":12}}},{"$skip":23}]', (string) $pipeline);
}