Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /users/danielstruebig/www/Dart_software/vendor/mollie/mollie-api-php/tests/Mollie/API/HttpAdapter/Guzzle6And7MollieHttpAdapterTest.php:14 Stack trace: #0 {main} thrown in /users/danielstruebig/www/Dart_software/vendor/mollie/mollie-api-php/tests/Mollie/API/HttpAdapter/Guzzle6And7MollieHttpAdapterTest.php on line 14