Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /users/danielstruebig/www/firma/vendor/sabberworm/php-css-parser/tests/CSSList/KeyFrameTest.php:14 Stack trace: #0 {main} thrown in /users/danielstruebig/www/firma/vendor/sabberworm/php-css-parser/tests/CSSList/KeyFrameTest.php on line 14