Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /var/www/html/lib/php-spreadsheet/tests/PhpSpreadsheetTests/Reader/Xlsx/Xlsx2Test.php:12 Stack trace: #0 {main} thrown in /var/www/html/lib/php-spreadsheet/tests/PhpSpreadsheetTests/Reader/Xlsx/Xlsx2Test.php on line 12