Fatal error: Uncaught Error: Class 'PHPUnit\Framework\TestCase' not found in /var/www/html/vendor/phpunit/phpunit-mock-objects/tests/Builder/InvocationMockerTest.php:13 Stack trace: #0 {main} thrown in /var/www/html/vendor/phpunit/phpunit-mock-objects/tests/Builder/InvocationMockerTest.php on line 13