Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /itss/home/arcelormittal/public_html/vendor/phpoffice/phpspreadsheet/tests/PhpSpreadsheetTests/Helper/SampleTest.php:8 Stack trace: #0 {main} thrown in /itss/home/arcelormittal/public_html/vendor/phpoffice/phpspreadsheet/tests/PhpSpreadsheetTests/Helper/SampleTest.php on line 8