Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in E:\xampp\htdocs\api.sis\vendor\phpunit\php-timer\tests\TimerTest.php:13 Stack trace: #0 {main} thrown in E:\xampp\htdocs\api.sis\vendor\phpunit\php-timer\tests\TimerTest.php on line 13