let extra_fees = vec![0, total_overpaid_amount];
let expected_route = &[&[&nodes[1], &nodes[3]][..], &[&nodes[2], &nodes[3]][..]];
let args = ClaimAlongRouteArgs::new(&nodes[0], &expected_route[..], payment_preimage)
let extra_fees = vec![0, total_overpaid_amount];
let expected_route = &[&[&nodes[1], &nodes[3]][..], &[&nodes[2], &nodes[3]][..]];
let args = ClaimAlongRouteArgs::new(&nodes[0], &expected_route[..], payment_preimage)