Fatal error: Uncaught Error: Class "PHPUnit\Framework\TestCase" not found in /var/www/html/w/vendor/data-values/validators/tests/ValueValidators/StringValidatorTest.php:20 Stack trace: #0 {main} thrown in /var/www/html/w/vendor/data-values/validators/tests/ValueValidators/StringValidatorTest.php on line 20