Fatal error: Uncaught Error: Class "SebastianBergmann\Comparator\Comparator" not found in I:\www\php_vendor_tests\vendor\phpspec\prophecy\src\Prophecy\Comparator\ClosureComparator.php:22 Stack trace: #0 {main} thrown in I:\www\php_vendor_tests\vendor\phpspec\prophecy\src\Prophecy\Comparator\ClosureComparator.php on line 22