The SOLEIL Optical Group (OG) is on charge of the definition, the simulation, and the tolerance of the future beamlines as well as the metrology of all the optical components which will be installed on these beamlines For this work, the OG strongly interacts with the scientists in charge of the beamline as well as the engineers. The OG also has in charge the design and construction of the METROLOGY and TESTS Beamline dedicated to the characterization of X and X-UVoptics and detectors . This project is carried out in collaboration with the (BNM) and the CEA DAM.