Fatal error: Uncaught Error: Class 'Magento\TestFramework\TestCase\WebapiAbstract' not found in /home/esecureh/public_html/magdemo/dev/tests/api-functional/testsuite/Magento/Customer/Api/GroupManagementTest.php:18 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/dev/tests/api-functional/testsuite/Magento/Customer/Api/GroupManagementTest.php on line 18