What is Automation Testing?

Because automations run unattended and often at scale, a bug that would be caught immediately by a human doing the task manually can instead run undetected for weeks, multiplying the damage. Testing an automation means exercising it against realistic input variety, including malformed or missing data, and confirming both the happy path and every defined error-handling branch behave as intended. Beyond pre-deployment testing, mature automation programs also run periodic regression checks against production automations, since the systems they integrate with change independently — an upstream API adding a required field or renaming a response key can silently break an automation that was correct when it shipped. Treating automation code with the same testing discipline as application code is what prevents “it worked when we built it” from becoming a recurring incident.