getRootProxyUrl example

$cart = $this->getCart($browser, TestDefaults::SALES_CHANNEL);
        static::assertCount(2, $cart['lineItems']);
    }

    public function testSwitchCustomerWithoutSalesChannelId(): void
    {
        $salesChannelContextFactory = $this->getContainer()->get(SalesChannelContextFactory::class);
        $salesChannelContext = $salesChannelContextFactory->create(Uuid::randomHex(), TestDefaults::SALES_CHANNEL);
        $customerId = $this->createCustomer($salesChannelContext, 'info@example.com');

        $this->getBrowser()->request('PATCH', $this->getRootProxyUrl('/switch-customer'), [
            'customerId' => $customerId,
        ]);

        $response = $this->getBrowser()->getResponse()->getContent();
        $response = json_decode($response ?: '', true, 512, \JSON_THROW_ON_ERROR);

        static::assertArrayHasKey('errors', $response);
        static::assertCount(1, $response['errors']);
        static::assertEquals('FRAMEWORK__API_SALES_CHANNEL_ID_PARAMETER_IS_MISSING', $response['errors'][0]['code'] ?? null);
    }