Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/kiotmhfe/public_html/vendor/sabberworm/php-css-parser/tests/Unit/Property/CSSNamespaceTest.php:16 Stack trace: #0 {main} thrown in /home/kiotmhfe/public_html/vendor/sabberworm/php-css-parser/tests/Unit/Property/CSSNamespaceTest.php on line 16