def METHOD_NAME(self):
    """
    Set up colloids in a N-square cell system coupled to ions on a
    regular decomposition cell system.
    """
    system = self.system
    system.cell_system.set_hybrid_decomposition(
        n_square_types={1}, cutoff_regular=0.1)
    p_ion = system.part.add(pos=[0., 0., 0.], type=0)
    p_colloid = system.part.add(pos=[0., 0., 0.], type=1)
    msg = "Cannot search for neighbors in the hybrid decomposition cell system"
    with np.testing.assert_raises_regex(RuntimeError, msg):
        system.cell_system.get_neighbors(p_ion, 0.05)
    with np.testing.assert_raises_regex(RuntimeError, msg):
        system.cell_system.get_neighbors(p_colloid, 0.05)