def METHOD_NAME(self):
    """
    Test the checks of validity of the inputs to `AbsorptionOnlyRaymarcher`.
    """
    # init the AO raymarcher
    raymarcher_ao = AbsorptionOnlyRaymarcher()
    # bad ways of passing densities and features
    # [rays_densities, rays_features, rays_z]
    bad_inputs = [[torch.Tensor(3)[0]]]
    for bad_input in bad_inputs:
        with self.assertRaises(ValueError):
            raymarcher_ao(*bad_input)