pass_along_path(&nodes[0], &path, 100_000, payment_hash, None, event, true, Some(payment_preimage));
// Next, attempt a keysend payment and make sure it fails.
pass_along_path(&nodes[0], &path, 100_000, payment_hash, None, event, true, Some(payment_preimage));
// Next, attempt a keysend payment and make sure it fails.