[Toybox] Toybox test image / fuzzing

[Andy Chu]

> I think the idea here was the importance of differentiating between
> stdout and stderr, and between text output and return code. This is as
> simple as having a separate output variable for each type of output.
>
> Granted, it will usually be unambiguous as to the correctness of the
> program, but having the return code in the output string can be
> confusing to the human looking at the test case. Plus, why would you not
> want to verify the exit code for every test? It's a lot of duplication
> to write "echo $?" in all of the test cases.
>
> As for stdout/stderr, it helps make sure diagnostic messages are going
> to the right stream when not using the helper functions.

Yes, that is exactly what I was getting at.  Instead of "testing",
there could be another function "testing-errors" or something.  But
it's not super important right now.

Andy

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