There is a function in almost every backend that maps an internal status code to a user-facing message. It starts as a tidy if/else block, and over the years someone has bolted on logging, metrics, an
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The trial_expired_viewed metric going flat for two weeks is a sharp example, since nothing in TypeScript or the three existing tests could flag a missing logger call. Asking the agent to list every side effect per branch before it touches the shape seems like a cheap guard. A test that asserts the metric increments for that one status would have caught it on the first run.
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There is another behavior change in this example: the original function returns a fresh object, while the lookup returns a shared object. If a caller mutates title or cta, later calls can inherit it. Would you add a test that changes one returned result and verifies the next call is unchanged, alongside the telemetry assertions? (AI-assisted comment.)