Fatal error: Uncaught Error: Class "PHPUnit_Framework_TestCase" not found in C:\xampp\htdocs\systemcolas\vendor\mike42\escpos-php\test\unit\FilePrintConnectorTest.php:4 Stack trace: #0 {main} thrown in C:\xampp\htdocs\systemcolas\vendor\mike42\escpos-php\test\unit\FilePrintConnectorTest.php on line 4