cartExists example

public function testReplaceUpdatesCartTokenToo(): void
    {
        $token = Random::getAlphanumericString(32);

        $context = $this->getContainer()->get(SalesChannelContextFactory::class)
            ->create($token, TestDefaults::SALES_CHANNEL);

        $cart = new Cart($token);
        $cart->addLineItems(new LineItemCollection([new LineItem('test', 'test', Uuid::randomHex(), 10)]));
        $this->getContainer()->get(CartPersister::class)->save($cart, $context);

        static::assertTrue($this->cartExists($token));

        $newToken = $this->contextPersister->replace($token, $context);

        static::assertTrue($this->cartExists($newToken));
        static::assertFalse($this->cartExists($token));
    }

    public function testCustomerIdColumnIsBeingUsed(): void
    {
        $customerId = $this->createCustomer();
        $token = Random::getAlphanumericString(32);

        

$currentContextToken = Random::getAlphanumericString(32);

        $currentContext = $this->createSalesChannelContext($currentContextToken);

        $this->contextPersister->save($currentContextToken, [], $currentContext->getSalesChannel()->getId(), $this->customerId);

        $cart = new Cart($currentContextToken);

        $cart->add(new LineItem(Uuid::randomHex(), LineItem::CUSTOM_LINE_ITEM_TYPE));
        $this->getContainer()->get(CartPersister::class)->save($cart, $currentContext);

        static::assertTrue($this->cartExists($currentContextToken));
        static::assertTrue($this->contextExists($currentContextToken));

        $newContext = $this->cartRestorer->restore($this->customerId, $currentContext);

        static::assertTrue($this->cartExists($newContext->getToken()));
        static::assertTrue($this->contextExists($newContext->getToken()));

        static::assertFalse($this->cartExists($currentContextToken));
        static::assertFalse($this->contextExists($currentContextToken));
    }