Fatal error: Uncaught Error: Class "Hamcrest\AbstractMatcherTest" not found in C:\xampp\htdocs\mflux\vendor\hamcrest\hamcrest-php\tests\Hamcrest\Array\IsArrayContainingKeyTest.php:6 Stack trace: #0 {main} thrown in C:\xampp\htdocs\mflux\vendor\hamcrest\hamcrest-php\tests\Hamcrest\Array\IsArrayContainingKeyTest.php on line 6