Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in D:\xampp7\htdocs\www\nbkm\show_ir\vendor\sebastian\environment\tests\RuntimeTest.php:17 Stack trace: #0 {main} thrown in D:\xampp7\htdocs\www\nbkm\show_ir\vendor\sebastian\environment\tests\RuntimeTest.php on line 17