Ignore vibe coders, when they tell you what their software does. They don't actually know what it does. They also have no clue how computers work and networks function. They couldn't design efficient and effective algorithms, if their lives depended on it.

They say they tested it. They're good testers.

No, I am a good tester. And part of being a good tester is...

Knowing precisely what the software is meant to do.

Knowing how computers work.

Knowing how networks function.

Knowing how to design efficient and effective algorithms.

The jokes on you:

Good testers know what the software does, better than the people who coded it.

Also, be honest, the AI writes the tests, too, doesn't it? They've "reviewed" it. Except that it's also code. So, no, they didn't.

This is like purchasing food from people who can't tell you what the ingredients are or how it was produced. It's usually going to turn out fine.