Warning: require(PHPUnit/Framework.php): Failed to open stream: No such file or directory in C:\xampp\htdocs\vendor\PHPMailer\test\phpmailerTest.php on line 16

Fatal error: Uncaught Error: Failed opening required 'PHPUnit/Framework.php' (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\vendor\PHPMailer\test\phpmailerTest.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\vendor\PHPMailer\test\phpmailerTest.php on line 16