  We combine measurements of galaxy velocities from galaxy surveys with
measurements of the Weyl potential from the Dark Energy Survey to test the
consistency of General Relativity at cosmological scales. Taking the ratio of
two model-independent observables - the growth rate of structure and the Weyl
potential - we obtain new measurements of the $E_G$ statistic with precision of
$5.8-10.7\%$ at four different redshifts. These measurements provide a
considerable improvement to past measurements of $E_G$. They confirm the
validity of General Relativity at three redshifts, while displaying a tension
of $2.5\sigma$ at $z=0.47$ as a consequence of the tension found in the
measurements of the Weyl potential. Contrary to conventional methods that rely
on a common galaxy sample with spectroscopic resolution to measure two types of
correlations, we directly combine two observables that are independent of the
galaxy bias. This provides a novel approach to testing the relation between the
geometry of our Universe and the motion of galaxies with improved precision.
