DRUPAL 7 - CRON Job Testing tools

Cron Debug will help you find cron processes which fail due to programming or runtime errors
time out (PHP, server, database) are very slow Cron Debug will also allow you to test run specific cron functions while not running others. This can be nice for developing cron functions where you don't want to run a full cron.php with all maintenance, alerts and other tasks every time you test your own function.

Modules to help track cron job issues:

1) https://www.drupal.org/project/cron_debug (Used this one for trouble shooting cron jobs)
2) https://www.drupal.org/project/ultimate_cron

Debugging cron jobs in Drupal 7.x