Fatal error: Uncaught Error: Class 'PHPUnit_Framework_TestCase' not found in /opt/lampp/htdocs/us/vendor/sabberworm/php-css-parser/tests/Sabberworm/CSS/ParserTest.php:13 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/us/vendor/sabberworm/php-css-parser/tests/Sabberworm/CSS/ParserTest.php on line 13