def METHOD_NAME(self):
    x, y = 1, 0
    rho0 = 1
    gamma = 2
    grav_pot = self.SPP.grav_pot(x, y, rho0, gamma, center_x=0, center_y=0)
    npt.assert_almost_equal(grav_pot, 12.566370614359172, decimal=8)