Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in D:\programs\xampp\htdocs\backend-test\vendor\verseles\flyclone\tests\Unit\AbstractProviderTest.php:11 Stack trace: #0 {main} thrown in D:\programs\xampp\htdocs\backend-test\vendor\verseles\flyclone\tests\Unit\AbstractProviderTest.php on line 11