Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in D:\xampp\htdocs\ebaymotors\vendor\symfony\service-contracts\Test\ServiceLocatorTest.php:18 Stack trace: #0 {main} thrown in D:\xampp\htdocs\ebaymotors\vendor\symfony\service-contracts\Test\ServiceLocatorTest.php on line 18