CartMergedEvent example

        $errors = $customerCart->getErrors();
        $customerCart->setErrors(new ErrorCollection());

        $customerCartClone = clone $customerCart;
        $customerCart->setErrors($errors);
        $customerCartClone->setErrors($errors);

        $mergedCart = $this->cartService->add($customerCart, $mergeableLineItems->getElements(), $customerContext);

        $this->eventDispatcher->dispatch(new CartMergedEvent($mergedCart, $customerContext, $customerCartClone));

        return $mergedCart;
    }

    private function replaceContextToken(?string $customerId, SalesChannelContext $currentContext, ?string $newToken = null): SalesChannelContext
    {
        $originalToken = $newToken;
        if ($newToken === null) {
            $newToken = $this->contextPersister->replace($currentContext->getToken(), $currentContext);
        }

        

$productLineItem1 = new LineItem($productId1, LineItem::PRODUCT_LINE_ITEM_TYPE, $productId1);
        $productLineItem2 = new LineItem($productId2, LineItem::PRODUCT_LINE_ITEM_TYPE, $productId2);
        $productLineItem1->setStackable(true);
        $productLineItem2->setStackable(true);
        $productLineItem1->setQuantity(1);
        $guestProductQuantity = 5;
        $productLineItem2->setQuantity($guestProductQuantity);

        $previousCart->addLineItems(new LineItemCollection([$productLineItem1, $productLineItem2]));
        $previousCart->markUnmodified();

        $cartMergedEvent = new CartMergedEvent(new Cart('customerToken'), $currentContext, $previousCart);

        $subscriber->addCartMergedNoticeFlash($cartMergedEvent);

        static::assertNotEmpty($infoFlash = $session->getFlashBag()->get('info'));

        static::assertEquals('checkout.cart-merged-hint', $infoFlash[0]);
    }

    /** * @param array<string, mixed> $salesChannelData */