HMC 751 LNA Testing

Recently I have requested a sample of HMC 751 LNA with the complete evaluation board from Analog devices that operates from 17-27 GHz with a stable gain of 25 dB. Do i need any additional components to test it? Or I can measure it directly with the VNA to test? Do I need to use any additional attenuator to reduce the signal power?

I am looking forward to hearing your response.