Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\symfony\service-contracts\Test\ServiceLocatorTestCase.php:20 Stack trace: #0 {main} thrown in C:\AppServ\Apache\2.4.58\htdocs\sets\vendor\symfony\service-contracts\Test\ServiceLocatorTestCase.php on line 20