Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/jasainfo/public_html/dev/tests/integration/testsuite/Magento/Catalog/Model/Attribute/Backend/CustomlayoutupdateTest.php:21 Stack trace: #0 {main} thrown in /home/jasainfo/public_html/dev/tests/integration/testsuite/Magento/Catalog/Model/Attribute/Backend/CustomlayoutupdateTest.php on line 21