FOS\UserBundle\DependencyInjection\FOSUserExtension::load PHP Method

    public function load(array $configs, ContainerBuilder $container)
    {
        $processor = new Processor();
        $configuration = new Configuration();
        $config = $processor->process($configuration->getConfigTree(), $configs);
        $loader = new XmlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));
        if (!in_array(strtolower($config['db_driver']), array('orm', 'mongodb'))) {
            throw new \InvalidArgumentException(sprintf('Invalid db driver "%s".', $config['db_driver']));
        }
        $loader->load(sprintf('%s.xml', $config['db_driver']));
        foreach (array('controller', 'templating', 'twig', 'form', 'validator', 'security', 'util', 'listener') as $basename) {
            $loader->load(sprintf('%s.xml', $basename));
        }
        if (!empty($config['service']['util']['mailer'])) {
            $container->setAlias('fos_user.util.mailer', $config['service']['util']['mailer']);
        }
        $this->remapParametersNamespaces($config, $container, array('' => array('provider_key' => 'fos_user.provider_key'), 'encoder' => 'fos_user.encoder.%s', 'template' => 'fos_user.template.%s', 'form_name' => 'fos_user.form.%s.name', 'form_validation_groups' => 'fos_user.form.%s.validation_groups'));
        $this->remapParametersNamespaces($config['class'], $container, array('model' => 'fos_user.model.%s.class', 'form' => 'fos_user.form.%s.class', 'controller' => 'fos_user.controller.%s.class', 'util' => 'fos_user.util.%s.class'));
        $this->remapParametersNamespaces($config['email'], $container, array('' => array('from_email' => 'fos_user.email.from_email'), 'confirmation' => 'fos_user.email.confirmation.%s', 'resetting_password' => 'fos_user.email.resetting_password.%s'));
    }

 /**
  * @return ContainerBuilder
  */
 protected function createFullConfiguration()
 {
     $this->configuration = new ContainerBuilder();
     $loader = new FOSUserExtension();
     $config = $this->getFullConfig();
     $loader->load(array($config), $this->configuration);
     $this->assertTrue($this->configuration instanceof ContainerBuilder);
 }