Dear fellow monks.

I think that some time ago I have seen somewhere information about a package on CPAN (in a blog post I think), which could be used in testing, and which:

• by default failed, when named output file was changed
• could run in such a mode, that it would "remember" current state of the file (if the change was intentional), which would prevent further fails (until next change)

Imagine you are programmatically creating complex structured text, and want to be able to "keep it fixed" in you tests - unless you know that the change is "for the better"

Is my memory playing tricks on me? Are you aware of such library? I hope that what I vaguely described above makes sense.

Unfortunately, mu Google-fu is not advanced enough to yield the answer.

Regards, Jan

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Update: change the title, answer is in comments below.

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