function it_creates_cart(
        ValidatorInterface $validator,
        ConstraintViolationListInterface $violationList,
        ConstraintViolationInterface $constraintViolation,
        MessageBusInterface $bus,
        GenericSuccessViewFactoryInterface $genericSuccessViewFactory,
        ViewHandlerInterface $viewHandler
    ): void
    {
        $request = new Request([
            'token' => 'token',
            'cartId' => '12345'
        ]);

        $createCartRequest = new CreateCartRequest($request);

        $validator->validate($createCartRequest)->willReturn($violationList);

        $envelope = new Envelope($createCartRequest->getCommand(), []);
        $bus->dispatch($createCartRequest->getCommand())->willReturn($envelope);

        $genericSuccessViewFactory->create('12345')->willReturn(new GenericSuccessView());

        $viewHandler->handle(Argument::any(), Argument::any())->willReturn(new Response());

        $this->__invoke($request);
    }

    function it_returns_validation_error(
        ValidatorInterface $validator,
        ConstraintViolationInterface $constraintViolation,
        MessageBusInterface $bus,
        ValidationErrorViewFactoryInterface $validationErrorViewFactory,
        ViewHandlerInterface $viewHandler
    ): void
    {
        $request = new Request([
            'token' => 'token',
            'cartId' => '12345'
        ]);

        $createCartRequest = new CreateCartRequest($request);

        $violationList = new ConstraintViolationList([$constraintViolation->getWrappedObject()]);

        $validator->validate($createCartRequest)->willReturn($violationList);

        $envelope = new Envelope($createCartRequest->getCommand(), []);
        $bus->dispatch($createCartRequest->getCommand())->willReturn($envelope);

        $validationErrorViewFactory->create($violationList)->willReturn(new ValidationErrorView());

        $viewHandler->handle(Argument::any(), Argument::any())->willReturn(new Response());

        $this->__invoke($request);
    }

//***********************************************************************************************************

    public function __invoke(Request $request): Response
    {
        $createCartRequest = CreateCartRequest::fromHttpRequest($request);

        $validationResults = $this->validator->validate($createCartRequest);

        if (0 !== count($validationResults)) {
            return $this->viewHandler->handle(View::create(
                $this->validationErrorViewFactory->create($validationResults),
                Response::HTTP_BAD_REQUEST
            ));
        }

        $createCartCommand = $createCartRequest->getCommand();

        $this->bus->dispatch($createCartCommand);

        return $this->viewHandler->handle(View::create(
            $this->genericSuccessViewFactory->create($createCartCommand->cartId())
        ));
    }

//***********************************************************************************************************

final class CreateCartRequest
{
    /** @var string|null */
    private $token;

    /** @var string */
    private $cartId;

    public function __construct(Request $request)
    {
        $this->token = $request->query->get('token');
        $this->cartId = Uuid::uuid4()->toString();
    }

    public static function fromHttpRequest(Request $request): self
    {
        return new self($request);
    }

    public function getCommand(): CreateCart
    {
        return new CreateCart($this->token, $this->cartId);
    }
}