getInstanceId example

class InstanceServiceTest extends TestCase
{
    public function testItReturnsInstanceIdIfNull(): void
    {
        $instanceService = new InstanceService(
            '6.4.0.0',
            null
        );

        static::assertNull($instanceService->getInstanceId());
    }

    public function testItReturnsInstanceIdIfSet(): void
    {
        $instanceService = new InstanceService(
            '6.4.0.0',
            'i-am-unique'
        );

        static::assertEquals('i-am-unique', $instanceService->getInstanceId());
    }

    

private readonly InstanceService $instanceService
    ) {
    }

    /** * @param mixed[] $additionalData * * @return array<string, mixed>|null */
    public function fireTrackingEvent(string $eventName, array $additionalData = []): ?array
    {
        if (!$this->instanceService->getInstanceId()) {
            return null;
        }

        $additionalData['shopwareVersion'] = $this->instanceService->getShopwareVersion();
        $payload = [
            'additionalData' => $additionalData,
            'instanceId' => $this->instanceService->getInstanceId(),
            'event' => $eventName,
        ];

        try {