Fatal error: Uncaught Error: Class 'Magento\TestFramework\TestCase\AbstractBackendController' not found in /home/esecureh/public_html/magdemo/dev/tests/integration/testsuite/Magento/Customer/Block/Adminhtml/Edit/Tab/NewsletterTest.php:17 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/dev/tests/integration/testsuite/Magento/Customer/Block/Adminhtml/Edit/Tab/NewsletterTest.php on line 17