Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\pvcStruct\vendor\pvc\testing-traits\tests\testingTraits\MockNonNegativeIntegerValidatorFactoryTest.php:12 Stack trace: #0 {main} thrown in I:\www\pvcStruct\vendor\pvc\testing-traits\tests\testingTraits\MockNonNegativeIntegerValidatorFactoryTest.php on line 12