Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/esecureh/public_html/magdemo/dev/tests/integration/framework/Magento/TestFramework/TestCase/AbstractConfigFiles.php:13 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/dev/tests/integration/framework/Magento/TestFramework/TestCase/AbstractConfigFiles.php on line 13