Making the Program Robust

We now have a running program that meets ther spec.

But is it "robust"?

How do we find out?

Try to "break" it.

Testing a program like this for robustness involves several steps:

What can go wrong?
What happens if it does?: Sometimes nothing needs to be done.
If that is a problem, how can we detect it?
What can we do about it? Tell the user. Die gracefully Recover reasonably.

Examples:

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