Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/extensions/SemanticMediaWiki/tests/phpunit/DataValues/ConstraintSchemaValueTest.php:21 Stack trace: #0 {main} thrown in /var/www/html/extensions/SemanticMediaWiki/tests/phpunit/DataValues/ConstraintSchemaValueTest.php on line 21