  General relativity as one the pillar of modern cosmology has to be thoroughly
tested if we want to achieve an accurate cosmology. We present the results from
such a test on cosmological scales using cosmic shear and galaxy clustering
measurements. We parametrize potential deviation from general relativity as a
modification to the cosmological Poisson equation. We consider two models
relevant either for some linearized theory of massive gravity or for the
physics of extra-dimensions. We use the latest observations from the
CFHTLS-Wide survey and the SDSS survey to set our constraints. We do not find
any deviation from general relativity on scales between 0.04 and 10 Mpc. We
derive constraints on the graviton mass in a restricted class of model.
