TestServiceContainerWeakRefPass example

$container->addCompilerPass(new FragmentRendererPass());
        $this->addCompilerPassIfExists($container, SerializerPass::class);
        $this->addCompilerPassIfExists($container, PropertyInfoPass::class);
        $container->addCompilerPass(new ControllerArgumentValueResolverPass());
        $container->addCompilerPass(new CachePoolPass(), PassConfig::TYPE_BEFORE_OPTIMIZATION, 32);
        $container->addCompilerPass(new CachePoolClearerPass(), PassConfig::TYPE_AFTER_REMOVING);
        $container->addCompilerPass(new CachePoolPrunerPass(), PassConfig::TYPE_AFTER_REMOVING);
        $this->addCompilerPassIfExists($container, FormPass::class);
        $container->addCompilerPass(new WorkflowGuardListenerPass());
        $container->addCompilerPass(new ResettableServicePass(), PassConfig::TYPE_BEFORE_OPTIMIZATION, -32);
        $container->addCompilerPass(new RegisterLocaleAwareServicesPass());
        $container->addCompilerPass(new TestServiceContainerWeakRefPass(), PassConfig::TYPE_BEFORE_REMOVING, -32);
        $container->addCompilerPass(new TestServiceContainerRealRefPass(), PassConfig::TYPE_AFTER_REMOVING);
        $this->addCompilerPassIfExists($container, AddMimeTypeGuesserPass::class);
        $this->addCompilerPassIfExists($container, AddScheduleMessengerPass::class);
        $this->addCompilerPassIfExists($container, MessengerPass::class);
        $this->addCompilerPassIfExists($container, HttpClientPass::class);
        $this->addCompilerPassIfExists($container, AddAutoMappingConfigurationPass::class);
        $container->addCompilerPass(new RegisterReverseContainerPass(true));
        $container->addCompilerPass(new RegisterReverseContainerPass(false), PassConfig::TYPE_AFTER_REMOVING);
        $container->addCompilerPass(new RemoveUnusedSessionMarshallingHandlerPass());

        if ($container->getParameter('kernel.debug')) {
            

use Symfony\Component\DependencyInjection\ServiceLocator;

class TestServiceContainerRefPassesTest extends TestCase
{
    public function testProcess()
    {
        $container = new ContainerBuilder();
        $container->register('test.private_services_locator', ServiceLocator::class)
            ->setPublic(true)
            ->addArgument(0, []);

        $container->addCompilerPass(new TestServiceContainerWeakRefPass(), PassConfig::TYPE_BEFORE_REMOVING, -32);
        $container->addCompilerPass(new TestServiceContainerRealRefPass(), PassConfig::TYPE_AFTER_REMOVING);

        $container->register('Test\public_service')
            ->setPublic(true)
            ->addArgument(new Reference('Test\private_used_shared_service'))
            ->addArgument(new Reference('Test\private_used_non_shared_service'))
            ->addArgument(new Reference('Test\soon_private_service'))
        ;

        $container->register('Test\soon_private_service')
            ->setPublic(true)