I agree with Pete. You can make some estimates with small signal conditions, but the real answer lies in what it does in an actual circuit. I think it's safe to assume it will work according to its specs (if you have them), and it's probably not worth worrying about measuring and guessing based on it viewed as a lone component. If you actually build a PA with it, in a real circuit, then you can use all sorts of instrumentation to see how well it works, and tweak the design as required.
Ed
