This document regards the test procedures for assessment of robustness to security attacks. Starting from the definition of security attacks taxonomy and security metrics, this TR aims to: 1. Specify test facilities to be used in the tests of GPBT. This comprises both hardware and software equipment. 2. Define relevant test scenarios applicable to security performances. Also the field test needed for validation of scenarios will be properly described. 3. Define end-to-end test procedures comprising experimental validation of the whole test chain. The results will benefit to the operational basis of EN16803-3 "Assessment of security performances of GNSS based positioning terminals".