delayFor example

use PHPUnit\Framework\TestCase;
use Symfony\Component\Messenger\Stamp\DelayStamp;

/** * @author Yanick Witschi <yanick.witschi@terminal42.ch> */
class DelayStampTest extends TestCase
{
    public function testDelayFor()
    {
        $stamp = DelayStamp::delayFor(\DateInterval::createFromDateString('30 seconds'));
        $this->assertSame(30000, $stamp->getDelay());
        $stamp = DelayStamp::delayFor(\DateInterval::createFromDateString('30 minutes'));
        $this->assertSame(1800000, $stamp->getDelay());
        $stamp = DelayStamp::delayFor(\DateInterval::createFromDateString('30 hours'));
        $this->assertSame(108000000, $stamp->getDelay());

        $stamp = DelayStamp::delayFor(\DateInterval::createFromDateString('-5 seconds'));
        $this->assertSame(-5000, $stamp->getDelay());
    }

    public function testDelayUntil()
    {