Codeception\Module\WorkingSilex::loadApp PHP Method

    protected function loadApp()
    {
        parent::loadApp();
        $this->app->finish(function () {
            if ($this->app['mailer.initialized'] && $this->app['swiftmailer.use_spool'] && $this->app['swiftmailer.spooltransport'] instanceof \Swift_Transport_SpoolTransport) {
                $spool = $this->app['swiftmailer.spooltransport']->getSpool();
                $r = new \ReflectionClass($spool);
                $p = $r->getProperty('messages');
                $p->setAccessible(true);
                $p->setValue($spool, []);
            }
        }, 512);
    }