Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/esecureh/public_html/magdemo/dev/tests/integration/testsuite/Magento/Framework/HTTP/AsyncClientInterfaceTest.php:18 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/dev/tests/integration/testsuite/Magento/Framework/HTTP/AsyncClientInterfaceTest.php on line 18