creating unit tests (semi-)automatically?

Question

Is there a framework that supports generating some standard unit tests from annotations? An example of what I have in mind would be:

@HasPublicDefaultConstructor
public class Foo {

}

This would obviously be used to automatically generate a unit test that checks whether Foo has a default constructor. Am I the only person who thought of something like that yet? ;) While I'm most interested in Java, solutions in other languages would certainly be interesting, too.

EDIT: In response to S.Lott's answer, let me clarify:

I'm trying to test whether the class has a default constructor. (Of course that is just an example.) I could just do so by writing a test, but I find that quite tedious. So I'm looking for a tool that would process the annotations at compile time (via APT) and generate the test for me. Does something like that exist? If not, do you think it is a good idea?

Answer 1

The question is whether "polluting" the production code with Unit Testing information in the form of additional annotations is really such a good idea. Personally I'd vote against it.

Answer 2

It sounds like you are looking for a programming language with more declarative expressive power than standard Java. The tests you postulate fill in the gaps until the compiler can check the semantics of the declarations.

I don't know of any tool that converts from the kind of annotations you suggest into automated tests. It sounds like a nice TDD exercise, though, especially with the recent(-ish) compiler APIs.