Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-theme/Test/Unit/Model/Indexer/Design/Config/Plugin/WebsiteTest.php:17 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-theme/Test/Unit/Model/Indexer/Design/Config/Plugin/WebsiteTest.php on line 17