Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/labz/vendor/phpoffice/phpspreadsheet/tests/PhpSpreadsheetTests/Calculation/Functions/TextData/TextJoinTest.php:8 Stack trace: #0 {main} thrown in /var/www/html/labz/vendor/phpoffice/phpspreadsheet/tests/PhpSpreadsheetTests/Calculation/Functions/TextData/TextJoinTest.php on line 8