https://www.stuhec.de/tag/characterization-tests/https://www.stuhec.de/tag/php/https://www.stuhec.de/tag/legacy/https://www.stuhec.de/tag/refactoring/https://www.stuhec.de/tag/tdd/https://www.stuhec.de/tag/phpunit/https://www.stuhec.de/tag/8-4/https://www.stuhec.de/tag/migration/