Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in C:\xampp73\htdocs\MonitoresCIE_C\vendor\sebastian\comparator\tests\ScalarComparatorTest.php:21 Stack trace: #0 {main} thrown in C:\xampp73\htdocs\MonitoresCIE_C\vendor\sebastian\comparator\tests\ScalarComparatorTest.php on line 21