Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\electronica\vendor\incenteev\composer-parameter-handler\Tests\ScriptHandlerTest.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\electronica\vendor\incenteev\composer-parameter-handler\Tests\ScriptHandlerTest.php on line 8