ClassDiscriminatorFromClassMetadata example

static::assertNotNull($context->getExtension('foo'));

        $versionContext = $context->createWithVersionId(Uuid::randomHex());

        static::assertNotNull($versionContext->getExtension('foo'));
    }

    public function testExtensionsAreStripped(): void
    {
        $classMetadataFactory = new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader()));
        $discriminator = new ClassDiscriminatorFromClassMetadata($classMetadataFactory);

        $normalizers = [new StructNormalizer(), new ObjectNormalizer($classMetadataFactory, null, null, null, $discriminator), new ArrayDenormalizer()];
        $serializer = new Serializer($normalizers, [new JsonEncoder()]);

        $context = Context::createDefaultContext();

        $context->addExtension('foo', new ArrayEntity());

        $serialized = $serializer->serialize($context, 'json');
        $deserialized = $serializer->deserialize($serialized, Context::class, 'json');