Fatal error: Uncaught Error: Class 'PHPUnit_Framework_TestCase' not found in C:\MANTUM\xampp2\htdocs\MNT\ventasvariables2\libreria\vendor\guzzlehttp\ringphp\tests\Future\FutureValueTest.php:8 Stack trace: #0 {main} thrown in C:\MANTUM\xampp2\htdocs\MNT\ventasvariables2\libreria\vendor\guzzlehttp\ringphp\tests\Future\FutureValueTest.php on line 8