Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\vendor\robthree\twofactorauth\tests\Providers\Rng\CSRNGProviderTest.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\vendor\robthree\twofactorauth\tests\Providers\Rng\CSRNGProviderTest.php on line 9