Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp\htdocs\fiveplus\vendor\lstrojny\functional-php\tests\Functional\Exceptions\InvalidArgumentExceptionTest.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\fiveplus\vendor\lstrojny\functional-php\tests\Functional\Exceptions\InvalidArgumentExceptionTest.php on line 15