Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /home/luxurytr/public_html/lt8/vendor/symfony/process/Tests/ProcessBuilderTest.php:17 Stack trace: #0 {main} thrown in /home/luxurytr/public_html/lt8/vendor/symfony/process/Tests/ProcessBuilderTest.php on line 17