Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/luxurytr/public_html/lt8/vendor/ssnepenthe/color-utils/tests/Transformers/LightenTest.php:13 Stack trace: #0 {main} thrown in /home/luxurytr/public_html/lt8/vendor/ssnepenthe/color-utils/tests/Transformers/LightenTest.php on line 13