Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/esecureh/public_html/magdemo/vendor/magento/framework/ObjectManager/Test/Unit/Config/Reader/_files/ConfigDomMock.php:12 Stack trace: #0 /home/esecureh/public_html/magdemo/vendor/magento/framework/ObjectManager/Test/Unit/Config/Reader/DomTest.php(17): require_once() #1 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/framework/ObjectManager/Test/Unit/Config/Reader/_files/ConfigDomMock.php on line 12