/**
* Get the static instance of this factory.
*
* @return SpyFactory The static factory.
*/
public static function instance()
{
if (!self::$instance) {
self::$instance = new self(Sequencer::sequence('spy-label'), CallFactory::instance(), Invoker::instance(), GeneratorSpyFactory::instance(), IterableSpyFactory::instance());
}
return self::$instance;
}