toStorage example

        $customEntityXmlSchema = $this->getXmlSchema($pathToCustomEntityFile);
        if ($customEntityXmlSchema === null) {
            return null;
        }

        $customEntityXmlSchema = $this->customEntityEnrichmentService->enrich(
            $customEntityXmlSchema,
            $this->getAdminUiXmlSchema($pathToCustomEntityFile),
        );

        $this->customEntityPersister->update($customEntityXmlSchema->toStorage(), $extensionEntityType, $extensionId);
        $this->customEntitySchemaUpdater->update();

        return $customEntityXmlSchema;
    }

    private function getXmlSchema(string $pathToCustomEntityFile): ?CustomEntityXmlSchema
    {
        $filePath = Path::join($pathToCustomEntityFile, CustomEntityXmlSchema::FILENAME);
        if (!file_exists($filePath)) {
            return null;
        }

        

$this->getContainer()->get(Connection::class)->rollBack();

        self::cleanUp($container);
    }

    public function testSchemaUpdate(): void
    {
        $entities = CustomEntityXmlSchema::createFromXmlFile(__DIR__ . '/_fixtures/custom-entity-test/Resources/install.xml');

        $this->getContainer()
            ->get(CustomEntityPersister::class)
            ->update($entities->toStorage());

        $this->getContainer()
            ->get(CustomEntitySchemaUpdater::class)
            ->update();

        $schema = $this->getSchema();

        self::assertColumns($schema, 'custom_entity_blog', ['id', 'top_seller_id', 'author_id', 'created_at', 'updated_at', 'position', 'rating']);
        self::assertColumns($schema, 'ce_blog_comment', ['id', 'created_at', 'updated_at']);
        self::assertColumns($schema, 'custom_entity_to_remove', ['id', 'created_at', 'updated_at']);