Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-inventory-configurable-product-indexer/Test/Integration/SourceItemIndexerTest.php:19 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-inventory-configurable-product-indexer/Test/Integration/SourceItemIndexerTest.php on line 19