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I've seen not so many examples of testing with automatic tools, i.e. serializing/deserializing of JSON (which was paired in the following way: val actual = deserialize(serialize(string))), checking that appending symbols to string was done properly (and that's imho silly, cause it extremely hard to made a mistake in such plain operations).

Can you provide really useful examples/use cases for automatic testing with ScalaCheck that will unveil it advantages? Does it meant to be used mostly in paired style (straight/inverse functions like in JSON example above)?

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up vote 3 down vote accepted

You can take a look at the tests that Scala itself is using at the moment.

To be honest, I had never seen the kind of paired test you mention. The scope of ScalaCheck is pretty simple: if there's a rule, property, invariant or condition your code must observe, then ScalaCheck is a great fit for it.

I'll state this in reverse to make it even clearer. The only place where you don't use ScalaCheck is for code that is composed solely of exceptions -- that is, there is no rule that apply over inputs which will tell you something about the outputs.

There's very few places I can think of where such a thing would happen.

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