Early in my automation career I believed something dangerous:
"If automation passes, the system is safe."
One release proved me wrong.
All tests were green.
CI pipeline passed.
Deployment happened.
Minutes later support reported users couldn't complete checkout.
The issue?
Our automation mocked the payment service.
The real integration had changed.
Automation verified the mock, not the system.
That moment changed how I design tests.
Now I always ask:
Are we testing reality?
Or just a simulation?
Automation should reduce risk.
But only if it tests real system behavior.
Have you ever seen automation give a false sense of security?
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