Checkpoint example

use Symfony\Component\Lock\LockInterface;
use Symfony\Component\Lock\NoLock;
use Symfony\Component\Lock\Store\InMemoryStore;
use Symfony\Component\Scheduler\Generator\Checkpoint;

class CheckpointTest extends TestCase
{
    public function testWithoutLockAndWithoutState()
    {
        $now = new \DateTimeImmutable('2020-02-20 20:20:20Z');
        $later = $now->modify('1 hour');
        $checkpoint = new Checkpoint('dummy');

        $this->assertTrue($checkpoint->acquire($now));
        $this->assertSame($now, $checkpoint->time());
        $this->assertSame(-1, $checkpoint->index());

        $checkpoint->save($later, 7);

        $this->assertSame($later, $checkpoint->time());
        $this->assertSame(7, $checkpoint->index());

        $checkpoint->release($later, null);
    }

return $this->triggerHeap = $heap;
    }

    private function schedule(): Schedule
    {
        return $this->schedule ??= $this->scheduleProvider->getSchedule();
    }

    private function checkpoint(): Checkpoint
    {
        return $this->checkpoint ??= new Checkpoint('scheduler_checkpoint_'.$this->name, $this->schedule()->getLock(), $this->schedule()->getState());
    }
}