AttachmentLoader example

private EventDispatcherInterface $eventDispatcherMock;

    private SalesChannelContext $salesChannelContext;

    private Context $context;

    protected function setUp(): void
    {
        $this->documentGenerator = $this->getContainer()->get(DocumentGenerator::class);
        $this->eventDispatcherMock = $this->createMock(EventDispatcherInterface::class);

        $this->attachmentLoader = new AttachmentLoader(
            $this->getContainer()->get('document.repository'),
            $this->documentGenerator,
            $this->eventDispatcherMock
        );

        $this->context = Context::createDefaultContext();

        $customerId = $this->createCustomer();

        $this->salesChannelContext = $this->getContainer()->get(SalesChannelContextFactory::class)->create(
            Uuid::randomHex(),