Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/demoinvfsanz/public_html/vendor/league/mime-type-detection/src/ExtensionMimeTypeDetectorTest.php:10 Stack trace: #0 {main} thrown in /home/demoinvfsanz/public_html/vendor/league/mime-type-detection/src/ExtensionMimeTypeDetectorTest.php on line 10