Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/eregistrandocom/public_html/vendor/phpoffice/phpspreadsheet/tests/PhpSpreadsheetTests/Calculation/Functions/Information/IsErrorTest.php:11 Stack trace: #0 {main} thrown in /home/eregistrandocom/public_html/vendor/phpoffice/phpspreadsheet/tests/PhpSpreadsheetTests/Calculation/Functions/Information/IsErrorTest.php on line 11