Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\cms-propay\vendor\tttran\viet_qr_generator\tests\QRGeneratorTest.php:8 Stack trace: #0 {main} thrown in C:\xampp\htdocs\cms-propay\vendor\tttran\viet_qr_generator\tests\QRGeneratorTest.php on line 8