Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp7\htdocs\spednfe\vendor\tecnickcom\tc-lib-color\test\Model\RgbTest.php:31 Stack trace: #0 {main} thrown in C:\xampp7\htdocs\spednfe\vendor\tecnickcom\tc-lib-color\test\Model\RgbTest.php on line 31