Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/_old/server/vendor/sebastian/diff/tests/Output/Integration/StrictUnifiedDiffOutputBuilderIntegrationTest.php:27 Stack trace: #0 {main} thrown in /var/www/html/_old/server/vendor/sebastian/diff/tests/Output/Integration/StrictUnifiedDiffOutputBuilderIntegrationTest.php on line 27