Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/jasainfo/public_html/dev/tests/integration/testsuite/Magento/Weee/Model/TaxTest.php:18 Stack trace: #0 {main} thrown in /home/jasainfo/public_html/dev/tests/integration/testsuite/Magento/Weee/Model/TaxTest.php on line 18