<?php /**
* Copyright © 2016 Magento. All rights reserved. * See COPYING.txt for license details.
*/
MagentoFrameworkComponentComponentRegistrar::register( MagentoFrameworkComponentComponentRegistrar::MODULE, 'Autosynch_synchProduct',
__DIR__
);

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Cron:etc/crontab.xsd">
    <group id="default">
        <job name="custom_cronjob" instance="AutosynchsynchProductCronTests" method="execute">
            <schedule>* * * * *</schedule>
        </job>
    </group>
</config>

<?php
namespace AutosynchsynchProductCron;
use PsrLogLoggerInterface;

class Tests {
    protected $logger;

    public function __construct(LoggerInterface $logger) {
        $this->logger = $logger;
    }

/**
   * Write to system.log
   *
   * @return void
   */

    public function execute() {
        $this->logger->info('Cron Works');
    }

}