Merge pull request #2226 from alecchendev/2023-04-persist-network-graph-on-rgs
[rust-lightning] / lightning / src / util / test_utils.rs
index 42c664e5b3d5a86bb4b47828ab0a47cd71b70aea..e51bbb9271983986650ac31fef823473ee498f0a 100644 (file)
@@ -16,18 +16,19 @@ use crate::chain::chainmonitor::MonitorUpdateId;
 use crate::chain::channelmonitor;
 use crate::chain::channelmonitor::MonitorEvent;
 use crate::chain::transaction::OutPoint;
-use crate::chain::keysinterface;
+use crate::sign;
+use crate::events;
 use crate::ln::channelmanager;
 use crate::ln::features::{ChannelFeatures, InitFeatures, NodeFeatures};
 use crate::ln::{msgs, wire};
 use crate::ln::msgs::LightningError;
 use crate::ln::script::ShutdownScript;
-use crate::routing::gossip::NetworkGraph;
-use crate::routing::router::{find_route, InFlightHtlcs, Route, RouteHop, RouteParameters, Router, ScorerAccountingForInFlightHtlcs};
-use crate::routing::scoring::FixedPenaltyScorer;
+use crate::routing::gossip::{EffectiveCapacity, NetworkGraph, NodeId};
+use crate::routing::utxo::{UtxoLookup, UtxoLookupError, UtxoResult};
+use crate::routing::router::{find_route, InFlightHtlcs, Path, Route, RouteParameters, Router, ScorerAccountingForInFlightHtlcs};
+use crate::routing::scoring::{ChannelUsage, Score};
 use crate::util::config::UserConfig;
 use crate::util::enforcing_trait_impls::{EnforcingSigner, EnforcementState};
-use crate::util::events;
 use crate::util::logger::{Logger, Level, Record};
 use crate::util::ser::{Readable, ReadableArgs, Writer, Writeable};
 
@@ -47,17 +48,27 @@ use regex;
 
 use crate::io;
 use crate::prelude::*;
+use core::cell::RefCell;
 use core::time::Duration;
 use crate::sync::{Mutex, Arc};
 use core::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
 use core::mem;
 use bitcoin::bech32::u5;
-use crate::chain::keysinterface::{InMemorySigner, Recipient, EntropySource, NodeSigner, SignerProvider};
+use crate::sign::{InMemorySigner, Recipient, EntropySource, NodeSigner, SignerProvider};
 
 #[cfg(feature = "std")]
 use std::time::{SystemTime, UNIX_EPOCH};
 use bitcoin::Sequence;
 
+pub fn pubkey(byte: u8) -> PublicKey {
+       let secp_ctx = Secp256k1::new();
+       PublicKey::from_secret_key(&secp_ctx, &privkey(byte))
+}
+
+pub fn privkey(byte: u8) -> SecretKey {
+       SecretKey::from_slice(&[byte; 32]).unwrap()
+}
+
 pub struct TestVecWriter(pub Vec<u8>);
 impl Writer for TestVecWriter {
        fn write_all(&mut self, buf: &[u8]) -> Result<(), io::Error> {
@@ -77,17 +88,18 @@ impl chaininterface::FeeEstimator for TestFeeEstimator {
 
 pub struct TestRouter<'a> {
        pub network_graph: Arc<NetworkGraph<&'a TestLogger>>,
-       pub next_routes: Mutex<VecDeque<Result<Route, LightningError>>>,
+       pub next_routes: Mutex<VecDeque<(RouteParameters, Result<Route, LightningError>)>>,
+       pub scorer: &'a Mutex<TestScorer>,
 }
 
 impl<'a> TestRouter<'a> {
-       pub fn new(network_graph: Arc<NetworkGraph<&'a TestLogger>>) -> Self {
-               Self { network_graph, next_routes: Mutex::new(VecDeque::new()), }
+       pub fn new(network_graph: Arc<NetworkGraph<&'a TestLogger>>, scorer: &'a Mutex<TestScorer>) -> Self {
+               Self { network_graph, next_routes: Mutex::new(VecDeque::new()), scorer }
        }
 
-       pub fn expect_find_route(&self, result: Result<Route, LightningError>) {
+       pub fn expect_find_route(&self, query: RouteParameters, result: Result<Route, LightningError>) {
                let mut expected_routes = self.next_routes.lock().unwrap();
-               expected_routes.push_back(result);
+               expected_routes.push_back((query, result));
        }
 }
 
@@ -96,27 +108,50 @@ impl<'a> Router for TestRouter<'a> {
                &self, payer: &PublicKey, params: &RouteParameters, first_hops: Option<&[&channelmanager::ChannelDetails]>,
                inflight_htlcs: &InFlightHtlcs
        ) -> Result<Route, msgs::LightningError> {
-               if let Some(find_route_res) = self.next_routes.lock().unwrap().pop_front() {
-                       return find_route_res
+               if let Some((find_route_query, find_route_res)) = self.next_routes.lock().unwrap().pop_front() {
+                       assert_eq!(find_route_query, *params);
+                       if let Ok(ref route) = find_route_res {
+                               let locked_scorer = self.scorer.lock().unwrap();
+                               let scorer = ScorerAccountingForInFlightHtlcs::new(locked_scorer, inflight_htlcs);
+                               for path in &route.paths {
+                                       let mut aggregate_msat = 0u64;
+                                       for (idx, hop) in path.hops.iter().rev().enumerate() {
+                                               aggregate_msat += hop.fee_msat;
+                                               let usage = ChannelUsage {
+                                                       amount_msat: aggregate_msat,
+                                                       inflight_htlc_msat: 0,
+                                                       effective_capacity: EffectiveCapacity::Unknown,
+                                               };
+
+                                               // Since the path is reversed, the last element in our iteration is the first
+                                               // hop.
+                                               if idx == path.hops.len() - 1 {
+                                                       scorer.channel_penalty_msat(hop.short_channel_id, &NodeId::from_pubkey(payer), &NodeId::from_pubkey(&hop.pubkey), usage, &());
+                                               } else {
+                                                       let curr_hop_path_idx = path.hops.len() - 1 - idx;
+                                                       scorer.channel_penalty_msat(hop.short_channel_id, &NodeId::from_pubkey(&path.hops[curr_hop_path_idx - 1].pubkey), &NodeId::from_pubkey(&hop.pubkey), usage, &());
+                                               }
+                                       }
+                               }
+                       }
+                       return find_route_res;
                }
                let logger = TestLogger::new();
+               let scorer = self.scorer.lock().unwrap();
                find_route(
                        payer, params, &self.network_graph, first_hops, &logger,
-                       &ScorerAccountingForInFlightHtlcs::new(TestScorer::with_penalty(0), &inflight_htlcs),
+                       &ScorerAccountingForInFlightHtlcs::new(scorer, &inflight_htlcs), &(),
                        &[42; 32]
                )
        }
-       fn notify_payment_path_failed(&self, _path: &[&RouteHop], _short_channel_id: u64) {}
-       fn notify_payment_path_successful(&self, _path: &[&RouteHop]) {}
-       fn notify_payment_probe_successful(&self, _path: &[&RouteHop]) {}
-       fn notify_payment_probe_failed(&self, _path: &[&RouteHop], _short_channel_id: u64) {}
 }
 
-#[cfg(feature = "std")] // If we put this on the `if`, we get "attributes are not yet allowed on `if` expressions" on 1.41.1
 impl<'a> Drop for TestRouter<'a> {
        fn drop(&mut self) {
-               if std::thread::panicking() {
-                       return;
+               #[cfg(feature = "std")] {
+                       if std::thread::panicking() {
+                               return;
+                       }
                }
                assert!(self.next_routes.lock().unwrap().is_empty());
        }
@@ -135,7 +170,7 @@ impl SignerProvider for OnlyReadsKeysInterface {
        fn derive_channel_signer(&self, _channel_value_satoshis: u64, _channel_keys_id: [u8; 32]) -> Self::Signer { unreachable!(); }
 
        fn read_chan_signer(&self, mut reader: &[u8]) -> Result<Self::Signer, msgs::DecodeError> {
-               let inner: InMemorySigner = Readable::read(&mut reader)?;
+               let inner: InMemorySigner = ReadableArgs::read(&mut reader, self)?;
                let state = Arc::new(Mutex::new(EnforcementState::new()));
 
                Ok(EnforcingSigner::new_with_revoked(
@@ -145,8 +180,8 @@ impl SignerProvider for OnlyReadsKeysInterface {
                ))
        }
 
-       fn get_destination_script(&self) -> Script { unreachable!(); }
-       fn get_shutdown_scriptpubkey(&self) -> ShutdownScript { unreachable!(); }
+       fn get_destination_script(&self) -> Result<Script, ()> { Err(()) }
+       fn get_shutdown_scriptpubkey(&self) -> Result<ShutdownScript, ()> { Err(()) }
 }
 
 pub struct TestChainMonitor<'a> {
@@ -254,7 +289,7 @@ impl TestPersister {
                self.update_rets.lock().unwrap().push_back(next_ret);
        }
 }
-impl<Signer: keysinterface::Sign> chainmonitor::Persist<Signer> for TestPersister {
+impl<Signer: sign::WriteableEcdsaChannelSigner> chainmonitor::Persist<Signer> for TestPersister {
        fn persist_new_channel(&self, _funding_txo: OutPoint, _data: &channelmonitor::ChannelMonitor<Signer>, _id: MonitorUpdateId) -> chain::ChannelMonitorUpdateStatus {
                if let Some(update_ret) = self.update_rets.lock().unwrap().pop_front() {
                        return update_ret
@@ -282,8 +317,26 @@ pub struct TestBroadcaster {
 }
 
 impl TestBroadcaster {
-       pub fn new(blocks: Arc<Mutex<Vec<(Block, u32)>>>) -> TestBroadcaster {
-               TestBroadcaster { txn_broadcasted: Mutex::new(Vec::new()), blocks }
+       pub fn new(network: Network) -> Self {
+               Self {
+                       txn_broadcasted: Mutex::new(Vec::new()),
+                       blocks: Arc::new(Mutex::new(vec![(genesis_block(network), 0)])),
+               }
+       }
+
+       pub fn with_blocks(blocks: Arc<Mutex<Vec<(Block, u32)>>>) -> Self {
+               Self { txn_broadcasted: Mutex::new(Vec::new()), blocks }
+       }
+
+       pub fn txn_broadcast(&self) -> Vec<Transaction> {
+               self.txn_broadcasted.lock().unwrap().split_off(0)
+       }
+
+       pub fn unique_txn_broadcast(&self) -> Vec<Transaction> {
+               let mut txn = self.txn_broadcasted.lock().unwrap().split_off(0);
+               let mut seen = HashSet::new();
+               txn.retain(|tx| seen.insert(tx.txid()));
+               txn
        }
 }
 
@@ -291,7 +344,7 @@ impl chaininterface::BroadcasterInterface for TestBroadcaster {
        fn broadcast_transaction(&self, tx: &Transaction) {
                let lock_time = tx.lock_time.0;
                assert!(lock_time < 1_500_000_000);
-               if lock_time > self.blocks.lock().unwrap().len() as u32 + 1 && lock_time < 500_000_000 {
+               if bitcoin::LockTime::from(tx.lock_time).is_block_height() && lock_time > self.blocks.lock().unwrap().last().unwrap().1 {
                        for inp in tx.input.iter() {
                                if inp.sequence != Sequence::MAX {
                                        panic!("We should never broadcast a transaction before its locktime ({})!", tx.lock_time);
@@ -305,6 +358,7 @@ impl chaininterface::BroadcasterInterface for TestBroadcaster {
 pub struct TestChannelMessageHandler {
        pub pending_events: Mutex<Vec<events::MessageSendEvent>>,
        expected_recv_msgs: Mutex<Option<Vec<wire::Message<()>>>>,
+       connected_peers: Mutex<HashSet<PublicKey>>,
 }
 
 impl TestChannelMessageHandler {
@@ -312,6 +366,7 @@ impl TestChannelMessageHandler {
                TestChannelMessageHandler {
                        pending_events: Mutex::new(Vec::new()),
                        expected_recv_msgs: Mutex::new(None),
+                       connected_peers: Mutex::new(HashSet::new()),
                }
        }
 
@@ -396,8 +451,11 @@ impl msgs::ChannelMessageHandler for TestChannelMessageHandler {
        fn handle_channel_reestablish(&self, _their_node_id: &PublicKey, msg: &msgs::ChannelReestablish) {
                self.received_msg(wire::Message::ChannelReestablish(msg.clone()));
        }
-       fn peer_disconnected(&self, _their_node_id: &PublicKey, _no_connection_possible: bool) {}
-       fn peer_connected(&self, _their_node_id: &PublicKey, _msg: &msgs::Init) -> Result<(), ()> {
+       fn peer_disconnected(&self, their_node_id: &PublicKey) {
+               assert!(self.connected_peers.lock().unwrap().remove(their_node_id));
+       }
+       fn peer_connected(&self, their_node_id: &PublicKey, _msg: &msgs::Init, _inbound: bool) -> Result<(), ()> {
+               assert!(self.connected_peers.lock().unwrap().insert(their_node_id.clone()));
                // Don't bother with `received_msg` for Init as its auto-generated and we don't want to
                // bother re-generating the expected Init message in all tests.
                Ok(())
@@ -411,6 +469,50 @@ impl msgs::ChannelMessageHandler for TestChannelMessageHandler {
        fn provided_init_features(&self, _their_init_features: &PublicKey) -> InitFeatures {
                channelmanager::provided_init_features(&UserConfig::default())
        }
+
+       fn handle_open_channel_v2(&self, _their_node_id: &PublicKey, msg: &msgs::OpenChannelV2) {
+               self.received_msg(wire::Message::OpenChannelV2(msg.clone()));
+       }
+
+       fn handle_accept_channel_v2(&self, _their_node_id: &PublicKey, msg: &msgs::AcceptChannelV2) {
+               self.received_msg(wire::Message::AcceptChannelV2(msg.clone()));
+       }
+
+       fn handle_tx_add_input(&self, _their_node_id: &PublicKey, msg: &msgs::TxAddInput) {
+               self.received_msg(wire::Message::TxAddInput(msg.clone()));
+       }
+
+       fn handle_tx_add_output(&self, _their_node_id: &PublicKey, msg: &msgs::TxAddOutput) {
+               self.received_msg(wire::Message::TxAddOutput(msg.clone()));
+       }
+
+       fn handle_tx_remove_input(&self, _their_node_id: &PublicKey, msg: &msgs::TxRemoveInput) {
+               self.received_msg(wire::Message::TxRemoveInput(msg.clone()));
+       }
+
+       fn handle_tx_remove_output(&self, _their_node_id: &PublicKey, msg: &msgs::TxRemoveOutput) {
+               self.received_msg(wire::Message::TxRemoveOutput(msg.clone()));
+       }
+
+       fn handle_tx_complete(&self, _their_node_id: &PublicKey, msg: &msgs::TxComplete) {
+               self.received_msg(wire::Message::TxComplete(msg.clone()));
+       }
+
+       fn handle_tx_signatures(&self, _their_node_id: &PublicKey, msg: &msgs::TxSignatures) {
+               self.received_msg(wire::Message::TxSignatures(msg.clone()));
+       }
+
+       fn handle_tx_init_rbf(&self, _their_node_id: &PublicKey, msg: &msgs::TxInitRbf) {
+               self.received_msg(wire::Message::TxInitRbf(msg.clone()));
+       }
+
+       fn handle_tx_ack_rbf(&self, _their_node_id: &PublicKey, msg: &msgs::TxAckRbf) {
+               self.received_msg(wire::Message::TxAckRbf(msg.clone()));
+       }
+
+       fn handle_tx_abort(&self, _their_node_id: &PublicKey, msg: &msgs::TxAbort) {
+               self.received_msg(wire::Message::TxAbort(msg.clone()));
+       }
 }
 
 impl events::MessageSendEventsProvider for TestChannelMessageHandler {
@@ -434,10 +536,10 @@ fn get_dummy_channel_announcement(short_chan_id: u64) -> msgs::ChannelAnnounceme
                features: ChannelFeatures::empty(),
                chain_hash: genesis_block(network).header.block_hash(),
                short_channel_id: short_chan_id,
-               node_id_1: PublicKey::from_secret_key(&secp_ctx, &node_1_privkey),
-               node_id_2: PublicKey::from_secret_key(&secp_ctx, &node_2_privkey),
-               bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, &node_1_btckey),
-               bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, &node_2_btckey),
+               node_id_1: NodeId::from_pubkey(&PublicKey::from_secret_key(&secp_ctx, &node_1_privkey)),
+               node_id_2: NodeId::from_pubkey(&PublicKey::from_secret_key(&secp_ctx, &node_2_privkey)),
+               bitcoin_key_1: NodeId::from_pubkey(&PublicKey::from_secret_key(&secp_ctx, &node_1_btckey)),
+               bitcoin_key_2: NodeId::from_pubkey(&PublicKey::from_secret_key(&secp_ctx, &node_2_btckey)),
                excess_data: Vec::new(),
        };
 
@@ -509,11 +611,11 @@ impl msgs::RoutingMessageHandler for TestRoutingMessageHandler {
                Some((chan_ann, Some(chan_upd_1), Some(chan_upd_2)))
        }
 
-       fn get_next_node_announcement(&self, _starting_point: Option<&PublicKey>) -> Option<msgs::NodeAnnouncement> {
+       fn get_next_node_announcement(&self, _starting_point: Option<&NodeId>) -> Option<msgs::NodeAnnouncement> {
                None
        }
 
-       fn peer_connected(&self, their_node_id: &PublicKey, init_msg: &msgs::Init) -> Result<(), ()> {
+       fn peer_connected(&self, their_node_id: &PublicKey, init_msg: &msgs::Init, _inbound: bool) -> Result<(), ()> {
                if !init_msg.features.supports_gossip_queries() {
                        return Ok(());
                }
@@ -569,6 +671,8 @@ impl msgs::RoutingMessageHandler for TestRoutingMessageHandler {
                features.set_gossip_queries_optional();
                features
        }
+
+       fn processing_queue_high(&self) -> bool { false }
 }
 
 impl events::MessageSendEventsProvider for TestRoutingMessageHandler {
@@ -609,10 +713,10 @@ impl TestLogger {
        /// 1. belongs to the specified module and
        /// 2. contains `line` in it.
        /// And asserts if the number of occurrences is the same with the given `count`
-       pub fn assert_log_contains(&self, module: String, line: String, count: usize) {
+       pub fn assert_log_contains(&self, module: &str, line: &str, count: usize) {
                let log_entries = self.lines.lock().unwrap();
                let l: usize = log_entries.iter().filter(|&(&(ref m, ref l), _c)| {
-                       m == &module && l.contains(line.as_str())
+                       m == module && l.contains(line)
                }).map(|(_, c) | { c }).sum();
                assert_eq!(l, count)
        }
@@ -621,10 +725,10 @@ impl TestLogger {
        /// 1. belong to the specified module and
        /// 2. match the given regex pattern.
        /// Assert that the number of occurrences equals the given `count`
-       pub fn assert_log_regex(&self, module: String, pattern: regex::Regex, count: usize) {
+       pub fn assert_log_regex(&self, module: &str, pattern: regex::Regex, count: usize) {
                let log_entries = self.lines.lock().unwrap();
                let l: usize = log_entries.iter().filter(|&(&(ref m, ref l), _c)| {
-                       m == &module && pattern.is_match(&l)
+                       m == module && pattern.is_match(&l)
                }).map(|(_, c) | { c }).sum();
                assert_eq!(l, count)
        }
@@ -651,7 +755,7 @@ impl TestNodeSigner {
 }
 
 impl NodeSigner for TestNodeSigner {
-       fn get_inbound_payment_key_material(&self) -> crate::chain::keysinterface::KeyMaterial {
+       fn get_inbound_payment_key_material(&self) -> crate::sign::KeyMaterial {
                unreachable!()
        }
 
@@ -684,7 +788,7 @@ impl NodeSigner for TestNodeSigner {
 }
 
 pub struct TestKeysInterface {
-       pub backing: keysinterface::PhantomKeysManager,
+       pub backing: sign::PhantomKeysManager,
        pub override_random_bytes: Mutex<Option<[u8; 32]>>,
        pub disable_revocation_policy_check: bool,
        enforcement_states: Mutex<HashMap<[u8;32], Arc<Mutex<EnforcementState>>>>,
@@ -710,7 +814,7 @@ impl NodeSigner for TestKeysInterface {
                self.backing.ecdh(recipient, other_key, tweak)
        }
 
-       fn get_inbound_payment_key_material(&self) -> keysinterface::KeyMaterial {
+       fn get_inbound_payment_key_material(&self) -> sign::KeyMaterial {
                self.backing.get_inbound_payment_key_material()
        }
 
@@ -739,7 +843,7 @@ impl SignerProvider for TestKeysInterface {
        fn read_chan_signer(&self, buffer: &[u8]) -> Result<Self::Signer, msgs::DecodeError> {
                let mut reader = io::Cursor::new(buffer);
 
-               let inner: InMemorySigner = Readable::read(&mut reader)?;
+               let inner: InMemorySigner = ReadableArgs::read(&mut reader, self)?;
                let state = self.make_enforcement_state_cell(inner.commitment_seed);
 
                Ok(EnforcingSigner::new_with_revoked(
@@ -749,14 +853,14 @@ impl SignerProvider for TestKeysInterface {
                ))
        }
 
-       fn get_destination_script(&self) -> Script { self.backing.get_destination_script() }
+       fn get_destination_script(&self) -> Result<Script, ()> { self.backing.get_destination_script() }
 
-       fn get_shutdown_scriptpubkey(&self) -> ShutdownScript {
+       fn get_shutdown_scriptpubkey(&self) -> Result<ShutdownScript, ()> {
                match &mut *self.expectations.lock().unwrap() {
                        None => self.backing.get_shutdown_scriptpubkey(),
                        Some(expectations) => match expectations.pop_front() {
                                None => panic!("Unexpected get_shutdown_scriptpubkey"),
-                               Some(expectation) => expectation.returns,
+                               Some(expectation) => Ok(expectation.returns),
                        },
                }
        }
@@ -766,7 +870,7 @@ impl TestKeysInterface {
        pub fn new(seed: &[u8; 32], network: Network) -> Self {
                let now = Duration::from_secs(genesis_block(network).header.time as u64);
                Self {
-                       backing: keysinterface::PhantomKeysManager::new(seed, now.as_secs(), now.subsec_nanos(), seed),
+                       backing: sign::PhantomKeysManager::new(seed, now.as_secs(), now.subsec_nanos(), seed),
                        override_random_bytes: Mutex::new(None),
                        disable_revocation_policy_check: false,
                        enforcement_states: Mutex::new(HashMap::new()),
@@ -774,7 +878,7 @@ impl TestKeysInterface {
                }
        }
 
-       /// Sets an expectation that [`keysinterface::SignerProvider::get_shutdown_scriptpubkey`] is
+       /// Sets an expectation that [`sign::SignerProvider::get_shutdown_scriptpubkey`] is
        /// called.
        pub fn expect(&self, expectation: OnGetShutdownScriptpubkey) -> &Self {
                self.expectations.lock().unwrap()
@@ -822,7 +926,7 @@ impl Drop for TestKeysInterface {
        }
 }
 
-/// An expectation that [`keysinterface::SignerProvider::get_shutdown_scriptpubkey`] was called and
+/// An expectation that [`sign::SignerProvider::get_shutdown_scriptpubkey`] was called and
 /// returns a [`ShutdownScript`].
 pub struct OnGetShutdownScriptpubkey {
        /// A shutdown script used to close a channel.
@@ -837,7 +941,8 @@ impl core::fmt::Debug for OnGetShutdownScriptpubkey {
 
 pub struct TestChainSource {
        pub genesis_hash: BlockHash,
-       pub utxo_ret: Mutex<Result<TxOut, chain::AccessError>>,
+       pub utxo_ret: Mutex<UtxoResult>,
+       pub get_utxo_call_count: AtomicUsize,
        pub watched_txn: Mutex<HashSet<(Txid, Script)>>,
        pub watched_outputs: Mutex<HashSet<(OutPoint, Script)>>,
 }
@@ -847,17 +952,19 @@ impl TestChainSource {
                let script_pubkey = Builder::new().push_opcode(opcodes::OP_TRUE).into_script();
                Self {
                        genesis_hash: genesis_block(network).block_hash(),
-                       utxo_ret: Mutex::new(Ok(TxOut { value: u64::max_value(), script_pubkey })),
+                       utxo_ret: Mutex::new(UtxoResult::Sync(Ok(TxOut { value: u64::max_value(), script_pubkey }))),
+                       get_utxo_call_count: AtomicUsize::new(0),
                        watched_txn: Mutex::new(HashSet::new()),
                        watched_outputs: Mutex::new(HashSet::new()),
                }
        }
 }
 
-impl chain::Access for TestChainSource {
-       fn get_utxo(&self, genesis_hash: &BlockHash, _short_channel_id: u64) -> Result<TxOut, chain::AccessError> {
+impl UtxoLookup for TestChainSource {
+       fn get_utxo(&self, genesis_hash: &BlockHash, _short_channel_id: u64) -> UtxoResult {
+               self.get_utxo_call_count.fetch_add(1, Ordering::Relaxed);
                if self.genesis_hash != *genesis_hash {
-                       return Err(chain::AccessError::UnknownChain);
+                       return UtxoResult::Sync(Err(UtxoLookupError::UnknownChain));
                }
 
                self.utxo_ret.lock().unwrap().clone()
@@ -882,5 +989,66 @@ impl Drop for TestChainSource {
        }
 }
 
-/// A scorer useful in testing, when the passage of time isn't a concern.
-pub type TestScorer = FixedPenaltyScorer;
+pub struct TestScorer {
+       /// Stores a tuple of (scid, ChannelUsage)
+       scorer_expectations: RefCell<Option<VecDeque<(u64, ChannelUsage)>>>,
+}
+
+impl TestScorer {
+       pub fn new() -> Self {
+               Self {
+                       scorer_expectations: RefCell::new(None),
+               }
+       }
+
+       pub fn expect_usage(&self, scid: u64, expectation: ChannelUsage) {
+               self.scorer_expectations.borrow_mut().get_or_insert_with(|| VecDeque::new()).push_back((scid, expectation));
+       }
+}
+
+#[cfg(c_bindings)]
+impl crate::util::ser::Writeable for TestScorer {
+       fn write<W: crate::util::ser::Writer>(&self, _: &mut W) -> Result<(), crate::io::Error> { unreachable!(); }
+}
+
+impl Score for TestScorer {
+       type ScoreParams = ();
+       fn channel_penalty_msat(
+               &self, short_channel_id: u64, _source: &NodeId, _target: &NodeId, usage: ChannelUsage, _score_params: &Self::ScoreParams
+       ) -> u64 {
+               if let Some(scorer_expectations) = self.scorer_expectations.borrow_mut().as_mut() {
+                       match scorer_expectations.pop_front() {
+                               Some((scid, expectation)) => {
+                                       assert_eq!(expectation, usage);
+                                       assert_eq!(scid, short_channel_id);
+                               },
+                               None => {},
+                       }
+               }
+               0
+       }
+
+       fn payment_path_failed(&mut self, _actual_path: &Path, _actual_short_channel_id: u64) {}
+
+       fn payment_path_successful(&mut self, _actual_path: &Path) {}
+
+       fn probe_failed(&mut self, _actual_path: &Path, _: u64) {}
+
+       fn probe_successful(&mut self, _actual_path: &Path) {}
+}
+
+impl Drop for TestScorer {
+       fn drop(&mut self) {
+               #[cfg(feature = "std")] {
+                       if std::thread::panicking() {
+                               return;
+                       }
+               }
+
+               if let Some(scorer_expectations) = self.scorer_expectations.borrow().as_ref() {
+                       if !scorer_expectations.is_empty() {
+                               panic!("Unsatisfied scorer expectations: {:?}", scorer_expectations)
+                       }
+               }
+       }
+}