Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/noct-c/www/tanakahashi/vendor/sebastian/exporter/tests/ExporterTest.php:18 Stack trace: #0 {main} thrown in /home/noct-c/www/tanakahashi/vendor/sebastian/exporter/tests/ExporterTest.php on line 18