Fatal error: Uncaught Error: Class "PHPUnit_Framework_TestCase" not found in C:\xampp\htdocs\systemcolas\vendor\mike42\escpos-php\test\unit\EscposPrintBufferTest.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\systemcolas\vendor\mike42\escpos-php\test\unit\EscposPrintBufferTest.php on line 15