PHPUnit features that surprise even professionals

PHPUnit has many lesser-known features that even experienced developers rarely use. Key highlights include using test names as executable documentation readable by domain experts (TestDox), the --check-php-configuration CLI option to verify PHP is properly set up for testing, --generate-configuration to scaffold a best-practice XML config, #[CoversClass] attributes to precisely document and scope code coverage, and #[Small]/#[Medium]/#[Large] attributes for test classification and selection. These features improve test robustness, maintainability, and precision of coverage reporting.