Fatal error: Uncaught Error: Class 'Magento\TestFramework\Indexer\TestCase' not found in /home/esecureh/public_html/magdemo/dev/tests/integration/testsuite/Magento/Customer/Model/ResourceModel/Grid/CollectionTest.php:18 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/dev/tests/integration/testsuite/Magento/Customer/Model/ResourceModel/Grid/CollectionTest.php on line 18