Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\r10ca\vendor\sebastian\type\tests\unit\ReflectionMapperTest.php:56 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10ca\vendor\sebastian\type\tests\unit\ReflectionMapperTest.php on line 56