Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/trairtil/public_html/vendor/league/commonmark/tests/unit/Extension/HeadingPermalink/HeadingPermalinkProcessorTest.php:29 Stack trace: #0 {main} thrown in /home/trairtil/public_html/vendor/league/commonmark/tests/unit/Extension/HeadingPermalink/HeadingPermalinkProcessorTest.php on line 29