TrackValidator.php

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<?php
namespace Magento\Sales\Model\Order\Shipment\Validation;

use Magento\Sales\Api\Data\ShipmentInterface;
use Magento\Sales\Model\ValidatorInterface;

class TrackValidator implements ValidatorInterface
{
    public function validate($entity)
    {
        $messages = [];
        if (!$entity->getTracks()) {
            return $messages;
        }
        foreach ($entity->getTracks() as $track) {
            if (!$track->getTrackNumber()) {
                $messages[] = __('Please enter a tracking number.');
            }
        }
        return $messages;
    }
}