Fatal error: Uncaught Error: Class "Wikimedia\Diff\DiffOp" not found in /var/www/html/w/tests/phpunit/unit/includes/libs/Diff/FakeDiffOp.php:10 Stack trace: #0 {main} thrown in /var/www/html/w/tests/phpunit/unit/includes/libs/Diff/FakeDiffOp.php on line 10