Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in I:\www\php_vendor_tests\vendor\mikey179\vfsstream\tests\phpunit\vfsStreamWrapperDirSeparatorTestCase.php:31 Stack trace: #0 {main} thrown in I:\www\php_vendor_tests\vendor\mikey179\vfsstream\tests\phpunit\vfsStreamWrapperDirSeparatorTestCase.php on line 31