Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\Apache24_x64\htdocs\radar\vendor\sebastian\type\tests\unit\NullTypeTest.php:17 Stack trace: #0 {main} thrown in C:\Apache24_x64\htdocs\radar\vendor\sebastian\type\tests\unit\NullTypeTest.php on line 17