A Test Result Is FACT Only About Its Input

A test verdict is a fact about that one input, not about the system. Match diagnostic rigor to the blast radius of the decision the result is about to drive.

A test said “the library is broken.” What it actually said was “this input on this version produced this output.” The step from verdict to “why” (“the library regressed,” “the environment is fine”) is inference, not fact.

The gate fires exactly when being wrong is most expensive — and when you feel most confident.

This gate almost never fires. Most verdicts drive small changes. It fires exactly when being wrong is most expensive, which is also exactly when you feel most confident.

Match diagnostic rigor to the blast radius (how much breaks if you’re wrong) of the decision the result is about to drive.
You can’t second-guess every test. That halts development. Make the check a trigger that fires only when a verdict is about to pick your infrastructure.
FACT-vs-ASSUME applied to the PR is useful, but if it’s not applied to the test evidence underneath the PR, it fails silently.

Green or red is a fact about that input. “So the system is fine” is inference, and inference needs rigor proportional to the decision it’s about to drive.

Related: Back to the chain reaction overview, or see contaminated test oracles and pinning with an exit plan.

Tags #devops #debugging #docker