Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/noct-c/www/tanakahashi/vendor/symfony/event-dispatcher/Tests/ImmutableEventDispatcherTest.php:22 Stack trace: #0 {main} thrown in /home/noct-c/www/tanakahashi/vendor/symfony/event-dispatcher/Tests/ImmutableEventDispatcherTest.php on line 22