do_claim_payment_along_route(&nodes[0], &vec!(&vec!(&nodes[fwd_idx])[..]), false, payment_preimage);
let events = nodes[0].node.get_and_clear_pending_events();
assert_eq!(events.len(), 2);
do_claim_payment_along_route(&nodes[0], &vec!(&vec!(&nodes[fwd_idx])[..]), false, payment_preimage);
let events = nodes[0].node.get_and_clear_pending_events();
assert_eq!(events.len(), 2);