public function testSchemaCallback() {
		$schema = array('_id' => array('type' => 'id'), 'created' => array('type' => 'date'));
		$db = new MongoDb(array('autoConnect' => false, 'schema' => function() use ($schema) {
			return $schema;
		}));
		$this->assertEqual($schema, $db->describe(null));
	}