public function testGet()
{
$id = new \MongoId();
$db = $this->getDatabase();
$document = ['_id' => $id, 'foo' => 'bar'];
$db->selectCollection('test')->insert($document);
$fetchedRef = \MongoDBRef::get($db, ['$ref' => 'test', '$id' => $id]);
$this->assertInternalType('array', $fetchedRef);
$this->assertEquals($document, $fetchedRef);
}