Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/jasainfo/public_html/dev/tests/integration/testsuite/Magento/Usps/Model/CarrierTest.php:20 Stack trace: #0 {main} thrown in /home/jasainfo/public_html/dev/tests/integration/testsuite/Magento/Usps/Model/CarrierTest.php on line 20