  We present the testbench aimed at integrating the GRAVITY+ adaptive optics
GPAO. It consists of two independent elements, one reproducing the Coud{\'e}
focus of the telescope, including the telescope deformable mirror mount (with
its surface facing down), and one reproducing the Coud{\'e} room
opto-mechanical environment, including a downwards-propagating beam, and the
telescope mechanical interfaces in order to fit in the new GPAO wavefront
sensor. We discuss in this paper the design of this bench and the solutions we
adopted to keep the cost low, keep the design compact (allowing it to be fully
contained in a 20 sqm clean room), and align the bench independently from the
adaptive optics. We also discuss the features we have set in this bench.
