initializeProxy example

        $container = new \LazyServiceProjectServiceContainer();

        $proxy = $container->get('foo');
        $this->assertInstanceOf(\stdClass::class, $proxy);
        $this->assertInstanceOf(LazyLoadingInterface::class, $proxy);
        $this->assertSame($proxy, $container->get('foo'));

        $this->assertFalse($proxy->isProxyInitialized());

        $proxy->initializeProxy();

        $this->assertTrue($proxy->isProxyInitialized());
        $this->assertSame($proxy, $container->get('foo'));
    }

    private function dumpLazyServiceProjectServiceContainer()
    {
        $container = new ContainerBuilder();

        $container->register('foo', \stdClass::class)->setPublic(true);
        $container->getDefinition('foo')->setLazy(true)->addTag('proxy', ['interface' => \stdClass::class]);
        

'irrelevant'
        );
        $registry->setTestContainer($container);

        $service = $container->get('foo');

        self::assertInstanceOf(\stdClass::class, $service);
        self::assertInstanceOf(LazyLoadingInterface::class, $service);
        self::assertInstanceOf(ValueHolderInterface::class, $service);
        self::assertFalse($service->isProxyInitialized());

        $service->initializeProxy();

        self::assertTrue($container->initialized('foo'));
        self::assertTrue($service->isProxyInitialized());

        $registry->resetManager();
        $service->initializeProxy();

        $wrappedValue = $service->getWrappedValueHolderValue();
        self::assertInstanceOf(\stdClass::class, $wrappedValue);
        self::assertNotInstanceOf(LazyLoadingInterface::class, $wrappedValue);
        self::assertNotInstanceOf(ValueHolderInterface::class, $wrappedValue);
    }

/* @var $foo1 \ProxyManager\Proxy\LazyLoadingInterface|\ProxyManager\Proxy\ValueHolderInterface */
        $foo1 = $builder->get('foo1');

        $foo1->__destruct();
        $this->assertSame(0, $foo1::$destructorCount);

        $this->assertSame($foo1, $builder->get('foo1'), 'The same proxy is retrieved on multiple subsequent calls');
        $this->assertInstanceOf(\ProxyManagerBridgeFooClass::class, $foo1);
        $this->assertInstanceOf(LazyLoadingInterface::class, $foo1);
        $this->assertFalse($foo1->isProxyInitialized());

        $foo1->initializeProxy();

        $this->assertSame($foo1, $builder->get('foo1'), 'The same proxy is retrieved after initialization');
        $this->assertTrue($foo1->isProxyInitialized());
        $this->assertInstanceOf(\ProxyManagerBridgeFooClass::class, $foo1->getWrappedValueHolderValue());
        $this->assertNotInstanceOf(LazyLoadingInterface::class, $foo1->getWrappedValueHolderValue());

        $foo1->__destruct();
        $this->assertSame(1, $foo1::$destructorCount);
    }
}

$container = $this->createMock(ContainerInterface::class);
        $definition = new Definition('stdClass');
        $instantiator = fn () => $instance;

        /* @var $proxy LazyLoadingInterface|ValueHolderInterface */
        $proxy = $this->instantiator->instantiateProxy($container, $definition, 'foo', $instantiator);

        $this->assertInstanceOf(LazyLoadingInterface::class, $proxy);
        $this->assertInstanceOf(ValueHolderInterface::class, $proxy);
        $this->assertFalse($proxy->isProxyInitialized());

        $proxy->initializeProxy();

        $this->assertSame($instance, $proxy->getWrappedValueHolderValue());
    }
}