Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\pvcStruct\tests\unit_tests\tree\node\fixture\TreenodeTestingFixture.php:24 Stack trace: #0 {main} thrown in I:\www\pvcStruct\tests\unit_tests\tree\node\fixture\TreenodeTestingFixture.php on line 24