Legacy Code Safety "Changing untested code is like performing surgery blindfolded." DANGER: The Risk of Modifying Untested Code Modifying code without tests is one of the HIGHEST-RISK activities in software development. When you change untested code: - You CANNOT know what behaviors you're breaking - You have NO safety net to catch mistakes - You're relying on hope instead of evidence - You're creating technical debt on top of technical debt In dynamically-typed languages (Python, JavaScript, Ruby, PHP), this risk is EXPONENTIALLY higher: - No compiler to catch type errors - No static analysi…