// Rebalance a bit so that we can send backwards from 3 to 1.
send_payment(&nodes[0], &[&nodes[1], &nodes[2]], 5000000);
let (_, payment_hash_1, _) = route_payment(&nodes[0], &[&nodes[1], &nodes[2]], 1000000);
nodes[2].node.fail_htlc_backwards(&payment_hash_1);
// Rebalance a bit so that we can send backwards from 3 to 1.
send_payment(&nodes[0], &[&nodes[1], &nodes[2]], 5000000);
let (_, payment_hash_1, _) = route_payment(&nodes[0], &[&nodes[1], &nodes[2]], 1000000);
nodes[2].node.fail_htlc_backwards(&payment_hash_1);