Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\cms-propay\vendor\coingate\coingate-php\tests\TestCase.php:5 Stack trace: #0 C:\xampp\htdocs\cms-propay\vendor\coingate\coingate-php\tests\bootstrap.php(3): require_once() #1 C:\xampp\htdocs\cms-propay\vendor\coingate\coingate-php\tests\bootstrap.no_autoload.php(5): require_once('C:\\xampp\\htdocs...') #2 {main} thrown in C:\xampp\htdocs\cms-propay\vendor\coingate\coingate-php\tests\TestCase.php on line 5