Fatal error: Uncaught Error: Class 'Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection' not found in /home/esecureh/public_html/magdemo/vendor/magento/framework/Model/Test/Unit/ResourceModel/Db/Collection/Uut.php:15 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/framework/Model/Test/Unit/ResourceModel/Db/Collection/Uut.php on line 15