def homog_compose_before_scale_test(): homog = HomogeneousTransform(np.array([[0, 1, 0], [1, 0, 0], [0, 0, 1]])) s = Scale([3, 4]) res = homog.compose_before(s) assert(isinstance(res, HomogeneousTransform)) assert_allclose(res.h_matrix, np.array([[0, 3, 0], [4, 0, 0], [0, 0, 1]]))