public function setUp()
{
if (!class_exists('MongoClient')) {
$this->markTestSkipped('pecl/mongo >= 1.3.0 is required to run this test');
}
$this->mongoClient = $this->getMockBuilder('MongoClient')->disableOriginalConstructor()->getMock();
$this->imageCollection = $this->getMockBuilder('MongoCollection')->disableOriginalConstructor()->getMock();
$this->shortUrlCollection = $this->getMockBuilder('MongoCollection')->disableOriginalConstructor()->getMock();
$this->driver = new MongoDB([], $this->mongoClient, $this->imageCollection, $this->shortUrlCollection);
}