Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /home/peekizt/www/vendor/markrogoyski/math-php/tests/Probability/Distribution/Continuous/FTest.php:7 Stack trace: #0 {main} thrown in /home/peekizt/www/vendor/markrogoyski/math-php/tests/Probability/Distribution/Continuous/FTest.php on line 7