Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/gameserver/public_html/vendor/symfony/stopwatch/Tests/StopwatchPeriodTest.php:17 Stack trace: #0 {main} thrown in /home/gameserver/public_html/vendor/symfony/stopwatch/Tests/StopwatchPeriodTest.php on line 17