Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/erp/spreadsheet/vendor/sebastian/code-unit-reverse-lookup/tests/WizardTest.php:18 Stack trace: #0 {main} thrown in /var/www/erp/spreadsheet/vendor/sebastian/code-unit-reverse-lookup/tests/WizardTest.php on line 18