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I read the first part of this article, then gave up and Googled "Test-case Reducers".

I'm not sure if that's an article failure (that I didn't want to read a whole ton of text and C code details), or a success (as it got me interested in the topic). I guess both?

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> I read the first part of this article, then gave up and Googled "Test-case Reducers".

It's answered pretty early on:

>> Test-case reducers try to reduce the length of an input

If that still doesn't answer the question, try this extension:

>> Test-case reducers try to reduce the length of an [error causing or interesting] input