Tests Don't Care Who Typed the Code
A pattern keeps showing up in teams that have adopted AI-assisted development. The reasoning sounds compelling at first: “The AI writes the code. Why do I still need to spend time on tests? Surely the AI can handle that too.” This is a misunderstanding of what tests are for. Software failure modes are properties of the system — not of the author. Whether a function was written by a junior developer, a principal engineer, or a language model, the same class of bugs is possible: boundary conditions missed, edge cases unhandled, implicit assumptions unexamined. The mechanism of authorship is irrelevant. The failure modes are not. ...