Fatal error: Uncaught Error: Class 'PHPUnit_Framework_TestCase' not found in E:\xampp\htdocs\api.astka\src\PHPMailer\test\phpmailerTest.php:22 Stack trace: #0 {main} thrown in E:\xampp\htdocs\api.astka\src\PHPMailer\test\phpmailerTest.php on line 22