Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /users/danielstruebig/www/firma/vendor/guzzlehttp/promises/tests/CoroutineTest.php:13 Stack trace: #0 {main} thrown in /users/danielstruebig/www/firma/vendor/guzzlehttp/promises/tests/CoroutineTest.php on line 13