+fn test_fee_failures() {
+ // Tests that the fee required when forwarding remains consistent over time. This was
+ // previously broken, with forwarding fees floating based on the fee estimator at the time of
+ // forwarding.
+ //
+ // When this test was written, the default base fee floated based on the HTLC count.
+ // It is now fixed, so we simply set the fee to the expected value here.
+ let mut config = test_default_channel_config();
+ config.channel_options.forwarding_fee_base_msat = 196;
+
+ let chanmon_cfgs = create_chanmon_cfgs(3);
+ let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
+ let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[Some(config), Some(config), Some(config)]);
+ let mut nodes = create_network(3, &node_cfgs, &node_chanmgrs);
+ let channels = [create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()), create_announced_chan_between_nodes(&nodes, 1, 2, InitFeatures::known(), InitFeatures::known())];
+ let logger = test_utils::TestLogger::new();
+ let route = get_route(&nodes[0].node.get_our_node_id(), &nodes[0].net_graph_msg_handler.network_graph, &nodes[2].node.get_our_node_id(), Some(InvoiceFeatures::known()), None, &Vec::new(), 40_000, TEST_FINAL_CLTV, &logger).unwrap();
+
+ // positive case
+ let (payment_preimage_success, payment_hash_success, payment_secret_success) = get_payment_preimage_hash!(nodes[2]);
+ nodes[0].node.send_payment(&route, payment_hash_success, &Some(payment_secret_success)).unwrap();
+ check_added_monitors!(nodes[0], 1);
+ pass_along_route(&nodes[0], &[&[&nodes[1], &nodes[2]]], 40_000, payment_hash_success, payment_secret_success);
+ claim_payment(&nodes[0], &[&nodes[1], &nodes[2]], payment_preimage_success);
+
+ let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(nodes[2]);
+ run_onion_failure_test("fee_insufficient", 0, &nodes, &route, &payment_hash, &payment_secret, |msg| {
+ msg.amount_msat -= 1;
+ }, || {}, true, Some(UPDATE|12), Some(NetworkUpdate::ChannelClosed { short_channel_id: channels[0].0.contents.short_channel_id, is_permanent: true}));
+
+ // In an earlier version, we spuriously failed to forward payments if the expected feerate
+ // changed between the channel open and the payment.
+ {
+ let mut feerate_lock = chanmon_cfgs[1].fee_estimator.sat_per_kw.lock().unwrap();
+ *feerate_lock *= 2;
+ }