Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/esecureh/public_html/magdemo/dev/tests/integration/testsuite/Magento/Newsletter/Model/SubscriberTest.php:24 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/dev/tests/integration/testsuite/Magento/Newsletter/Model/SubscriberTest.php on line 24