Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in C:\xampp\htdocs\kalimark\vendor\sebastian\comparator\tests\DoubleComparatorTest.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\kalimark\vendor\sebastian\comparator\tests\DoubleComparatorTest.php on line 22