Isn't that exactly the reason to put them somewhere else?

No, I just mean the actual tests might be something like:

    if (user == null) return false;
    if (IsCompleted(user)) return true;
    if (action == null) return false;
    if (value < 0 || value > 100) return false;   

You're not usually just passing a single value to a bunch of "test" functions.

Well, the way it was written, I was assuming that conditions to be satisfied had separate named predicates (although combinators could alleviate even some of these things).