Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/trairtil/public_html/vendor/tijsverkoyen/css-to-inline-styles/tests/CssToInlineStylesTest.php:9 Stack trace: #0 {main} thrown in /home/trairtil/public_html/vendor/tijsverkoyen/css-to-inline-styles/tests/CssToInlineStylesTest.php on line 9