Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/esecureh/public_html/magdemo/dev/tests/integration/testsuite/Magento/Catalog/Model/ResourceModel/Product/CollectionTest.php:21 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/dev/tests/integration/testsuite/Magento/Catalog/Model/ResourceModel/Product/CollectionTest.php on line 21