Maximiliano Contieri

Don’t let test code sneak into production TL;DR: Avoid adding isTesting or similar flags. Problems 😔 Solutions 😃 Remove behavior Ifs Use dependency injection Model external services (Don’t mock them) Separate configurations Isolate test logic Maintain clean behavior boundaries Refactorings ⚙️ Context 💬 When you add flags like isTesting, you mix testing and production code. This creates hidden paths that are only active in tests. Also, you don’t cover real production code. You risk shipping