Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\fiveplus\vendor\lstrojny\functional-php\tests\Functional\FunctionalTest.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\fiveplus\vendor\lstrojny\functional-php\tests\Functional\FunctionalTest.php on line 16