Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-elasticsearch/Test/Unit/Elasticsearch5/Model/Adapter/Index/IndexNameResolverTest.php:27 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-elasticsearch/Test/Unit/Elasticsearch5/Model/Adapter/Index/IndexNameResolverTest.php on line 27