Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\r10ca\vendor\sebastian\complexity\tests\unit\ComplexityTest.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10ca\vendor\sebastian\complexity\tests\unit\ComplexityTest.php on line 18