lntemp+itest: refactor testAnchorThirdPartySpend

lntemp/harness.go

@@ -1391,6 +1391,19 @@ func (h *HarnessTest) MineBlocksAndAssertNumTxes(num uint32,
 	return blocks
 }
 
+// MineEmptyBlocks mines a given number of empty blocks.
+//
+// NOTE: this differs from miner's `MineEmptyBlocks` as it requires the nodes
+// to be synced.
+func (h *HarnessTest) MineEmptyBlocks(num int) []*wire.MsgBlock {
+	blocks := h.Miner.MineEmptyBlocks(num)
+
+	// Finally, make sure all the active nodes are synced.
+	h.AssertActiveNodesSynced()
+
+	return blocks
+}
+
 // QueryChannelByChanPoint tries to find a channel matching the channel point
 // and asserts. It returns the channel found.
 func (h *HarnessTest) QueryChannelByChanPoint(hn *node.HarnessNode,

lntemp/harness_assertion.go

@@ -1927,3 +1927,45 @@ func (h *HarnessTest) AssertHtlcEvents(client rpc.HtlcEventsClient,
 
 	return events
 }
+
+// AssertTransactionInWallet asserts a given txid can be found in the node's
+// wallet.
+func (h *HarnessTest) AssertTransactionInWallet(hn *node.HarnessNode,
+	txid chainhash.Hash) {
+
+	req := &lnrpc.GetTransactionsRequest{}
+	err := wait.NoError(func() error {
+		txResp := hn.RPC.GetTransactions(req)
+		for _, txn := range txResp.Transactions {
+			if txn.TxHash == txid.String() {
+				return nil
+			}
+		}
+
+		return fmt.Errorf("%s: expected txid=%v not found in wallet",
+			hn.Name(), txid)
+	}, DefaultTimeout)
+
+	require.NoError(h, err, "failed to find tx")
+}
+
+// AssertTransactionNotInWallet asserts a given txid can NOT be found in the
+// node's wallet.
+func (h *HarnessTest) AssertTransactionNotInWallet(hn *node.HarnessNode,
+	txid chainhash.Hash) {
+
+	req := &lnrpc.GetTransactionsRequest{}
+	err := wait.NoError(func() error {
+		txResp := hn.RPC.GetTransactions(req)
+		for _, txn := range txResp.Transactions {
+			if txn.TxHash == txid.String() {
+				return fmt.Errorf("expected txid=%v to be "+
+					"not found", txid)
+			}
+		}
+
+		return nil
+	}, DefaultTimeout)
+
+	require.NoErrorf(h, err, "%s: failed to assert tx not found", hn.Name())
+}

lntemp/harness_miner.go

@@ -383,3 +383,35 @@ func (h *HarnessMiner) NewMinerAddress() btcutil.Address {
 	require.NoError(h, err, "failed to create new miner address")
 	return addr
 }
+
+// MineBlocksWithTxes mines a single block to include the specifies
+// transactions only.
+func (h *HarnessMiner) MineBlockWithTxes(txes []*btcutil.Tx) *wire.MsgBlock {
+	var emptyTime time.Time
+
+	// Generate a block.
+	b, err := h.GenerateAndSubmitBlock(txes, -1, emptyTime)
+	require.NoError(h, err, "unable to mine block")
+
+	block, err := h.Client.GetBlock(b.Hash())
+	require.NoError(h, err, "unable to get block")
+
+	return block
+}
+
+// MineEmptyBlocks mines a given number of empty blocks.
+func (h *HarnessMiner) MineEmptyBlocks(num int) []*wire.MsgBlock {
+	var emptyTime time.Time
+
+	blocks := make([]*wire.MsgBlock, num)
+	for i := 0; i < num; i++ {
+		// Generate an empty block.
+		b, err := h.GenerateAndSubmitBlock(nil, -1, emptyTime)
+		require.NoError(h, err, "unable to mine empty block")
+
+		block := h.GetBlock(b.Hash())
+		blocks[i] = block
+	}
+
+	return blocks
+}

lntest/itest/assertions.go

@@ -1418,30 +1418,6 @@ func assertTransactionNotInWallet(t *testing.T, node *lntest.HarnessNode,
 	)
 }
 
-func assertAnchorOutputLost(t *harnessTest, node *lntest.HarnessNode,
-	chanPoint wire.OutPoint) {
-
-	pendingChansRequest := &lnrpc.PendingChannelsRequest{}
-	err := wait.Predicate(func() bool {
-		resp, pErr := node.PendingChannels(
-			context.Background(), pendingChansRequest,
-		)
-		if pErr != nil {
-			return false
-		}
-
-		for _, pendingChan := range resp.PendingForceClosingChannels {
-			if pendingChan.Channel.ChannelPoint == chanPoint.String() {
-				return (pendingChan.Anchor ==
-					lnrpc.PendingChannelsResponse_ForceClosedChannel_LOST)
-			}
-		}
-
-		return false
-	}, defaultTimeout)
-	require.NoError(t.t, err, "anchor doesn't show as being lost")
-}
-
 // assertNodeAnnouncement compares that two node announcements match.
 func assertNodeAnnouncement(t *harnessTest, n1, n2 *lnrpc.NodeUpdate) {
 	// Alias should match.

lntest/itest/list_on_test.go

@@ -267,4 +267,8 @@ var allTestCasesTemp = []*lntemp.TestCase{
 		Name:     "anchors reserved value",
 		TestFunc: testAnchorReservedValue,
 	},
+	{
+		Name:     "3rd party anchor spend",
+		TestFunc: testAnchorThirdPartySpend,
+	},
 }

lntest/itest/lnd_channel_force_close_test.go

@@ -15,7 +15,6 @@ import (
 	"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
 	"github.com/lightningnetwork/lnd/lntemp"
 	"github.com/lightningnetwork/lnd/lntemp/node"
-	"github.com/lightningnetwork/lnd/lntest"
 	"github.com/lightningnetwork/lnd/lntest/wait"
 	"github.com/lightningnetwork/lnd/lnwallet"
 	"github.com/lightningnetwork/lnd/lnwallet/chainfee"
@@ -984,57 +983,6 @@ func padCLTV(cltv uint32) uint32 {
 	return cltv + uint32(routing.BlockPadding)
 }
 
-type sweptOutput struct {
-	OutPoint wire.OutPoint
-	SweepTx  *wire.MsgTx
-}
-
-// findCommitAndAnchor looks for a commitment sweep and anchor sweep in the
-// mempool. Our anchor output is identified by having multiple inputs, because
-// we have to bring another input to add fees to the anchor. Note that the
-// anchor swept output may be nil if the channel did not have anchors.
-// TODO(yy): delete.
-func findCommitAndAnchor(t *harnessTest, net *lntest.NetworkHarness,
-	sweepTxns []*wire.MsgTx, closeTx string) (*sweptOutput, *sweptOutput) {
-
-	var commitSweep, anchorSweep *sweptOutput
-
-	for _, tx := range sweepTxns {
-		txHash := tx.TxHash()
-		sweepTx, err := net.Miner.Client.GetRawTransaction(&txHash)
-		require.NoError(t.t, err)
-
-		// We expect our commitment sweep to have a single input, and,
-		// our anchor sweep to have more inputs (because the wallet
-		// needs to add balance to the anchor amount). We find their
-		// sweep txids here to setup appropriate resolutions. We also
-		// need to find the outpoint for our resolution, which we do by
-		// matching the inputs to the sweep to the close transaction.
-		inputs := sweepTx.MsgTx().TxIn
-		if len(inputs) == 1 {
-			commitSweep = &sweptOutput{
-				OutPoint: inputs[0].PreviousOutPoint,
-				SweepTx:  tx,
-			}
-		} else {
-			// Since we have more than one input, we run through
-			// them to find the outpoint that spends from the close
-			// tx. This will be our anchor output.
-			for _, txin := range inputs {
-				outpointStr := txin.PreviousOutPoint.Hash.String()
-				if outpointStr == closeTx {
-					anchorSweep = &sweptOutput{
-						OutPoint: txin.PreviousOutPoint,
-						SweepTx:  tx,
-					}
-				}
-			}
-		}
-	}
-
-	return commitSweep, anchorSweep
-}
-
 // testFailingChannel tests that we will fail the channel by force closing it
 // in the case where a counterparty tries to settle an HTLC with the wrong
 // preimage.

lntest/itest/lnd_onchain_test.go

@@ -4,7 +4,6 @@ import (
 	"bytes"
 	"context"
 	"fmt"
-	"time"
 
 	"github.com/btcsuite/btcd/btcutil"
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
@@ -14,6 +13,7 @@ import (
 	"github.com/lightningnetwork/lnd/lnrpc/chainrpc"
 	"github.com/lightningnetwork/lnd/lnrpc/walletrpc"
 	"github.com/lightningnetwork/lnd/lntemp"
+	"github.com/lightningnetwork/lnd/lntemp/node"
 	"github.com/lightningnetwork/lnd/lntest"
 	"github.com/lightningnetwork/lnd/lntest/wait"
 	"github.com/lightningnetwork/lnd/lnwallet"
@@ -396,11 +396,191 @@ func testAnchorReservedValue(ht *lntemp.HarnessTest) {
 	assertNumTxInAndTxOut(sweepTx, 4, 1)
 }
 
+// testAnchorThirdPartySpend tests that if we force close a channel, but then
+// don't sweep the anchor in time and a 3rd party spends it, that we remove any
+// transactions that are a descendent of that sweep.
+func testAnchorThirdPartySpend(ht *lntemp.HarnessTest) {
+	// First, we'll create two new nodes that both default to anchor
+	// channels.
+	//
+	// NOTE: The itests differ here as anchors is default off vs the normal
+	// lnd binary.
+	args := nodeArgsForCommitType(lnrpc.CommitmentType_ANCHORS)
+	alice := ht.NewNode("Alice", args)
+	defer ht.Shutdown(alice)
+
+	bob := ht.NewNode("Bob", args)
+	defer ht.Shutdown(bob)
+
+	ht.EnsureConnected(alice, bob)
+
+	// We'll fund our Alice with coins, as she'll be opening the channel.
+	// We'll fund her with *just* enough coins to open the channel and
+	// sweep the anchor.
+	const (
+		firstChanSize   = 1_000_000
+		anchorFeeBuffer = 500_000
+	)
+	ht.FundCoins(firstChanSize+anchorFeeBuffer, alice)
+
+	// Open the channel between the two nodes and wait for it to confirm
+	// fully.
+	aliceChanPoint1 := ht.OpenChannel(
+		alice, bob, lntemp.OpenChannelParams{
+			Amt: firstChanSize,
+		},
+	)
+
+	// Send another UTXO if this is a neutrino backend. When sweeping
+	// anchors, there are two transactions created, `local_sweep_tx` for
+	// sweeping Alice's anchor on the local commitment, `remote_sweep_tx`
+	// for sweeping her anchor on the remote commitment. Whenever the force
+	// close transaction is published, Alice will always create these two
+	// transactions to sweep her anchor.
+	// On the other hand, when creating the sweep txes, the anchor itself
+	// is not able to cover the fee, so another wallet UTXO is needed. In
+	// our test case, there's a change output that can be used from the
+	// above funding process. And it's used by both sweep txes - when `lnd`
+	// happens to create the `remote_sweep_tx` first, it will receive an
+	// error since its parent tx, the remote commitment, is not known,
+	// hence freeing the change output to be used by `local_sweep_tx`.
+	// For neutrino client, however, it will consider the transaction which
+	// sweeps the remote anchor as an orphan tx, and it will neither send
+	// it to the mempool nor return an error to free the change output.
+	// Thus, if the change output is already used in `remote_sweep_tx`, we
+	// won't have UTXO to create `local_sweep_tx`.
+	//
+	// NOTE: the order of the sweep requests for the two anchors cannot be
+	// guaranteed. If the sweeper happens to sweep the remote anchor first,
+	// then the test won't pass without the extra UTXO, which is the source
+	// of the flakeness.
+	//
+	// TODO(yy): make a RPC server for sweeper so we can explicitly check
+	// and control its state.
+	if ht.IsNeutrinoBackend() {
+		ht.FundCoins(anchorFeeBuffer, alice)
+	}
+
+	// With the channel open, we'll actually immediately force close it. We
+	// don't care about network announcements here since there's no routing
+	// in this test.
+	ht.CloseChannelAssertPending(alice, aliceChanPoint1, true)
+
+	// Now that the channel has been force closed, it should show up in the
+	// PendingChannels RPC under the waiting close section.
+	waitingClose := ht.AssertChannelWaitingClose(alice, aliceChanPoint1)
+
+	// At this point, the channel is waiting close, and we have both the
+	// commitment transaction and anchor sweep in the mempool.
+	const expectedTxns = 2
+	sweepTxns := ht.Miner.GetNumTxsFromMempool(expectedTxns)
+	aliceCloseTx := waitingClose.Commitments.LocalTxid
+	_, aliceAnchor := ht.FindCommitAndAnchor(sweepTxns, aliceCloseTx)
+
+	// We'll now mine _only_ the commitment force close transaction, as we
+	// want the anchor sweep to stay unconfirmed.
+	forceCloseTxID, _ := chainhash.NewHashFromStr(aliceCloseTx)
+	commitTxn := ht.Miner.GetRawTransaction(forceCloseTxID)
+	ht.Miner.MineBlockWithTxes([]*btcutil.Tx{commitTxn})
+
+	// With the anchor output located, and the main commitment mined we'll
+	// instruct the wallet to send all coins in the wallet to a new address
+	// (to the miner), including unconfirmed change.
+	minerAddr := ht.Miner.NewMinerAddress()
+	sweepReq := &lnrpc.SendCoinsRequest{
+		Addr:             minerAddr.String(),
+		SendAll:          true,
+		MinConfs:         0,
+		SpendUnconfirmed: true,
+	}
+	sweepAllResp := alice.RPC.SendCoins(sweepReq)
+
+	// Both the original anchor sweep transaction, as well as the
+	// transaction we created to sweep all the coins from Alice's wallet
+	// should be found in her transaction store.
+	sweepAllTxID, _ := chainhash.NewHashFromStr(sweepAllResp.Txid)
+	ht.AssertTransactionInWallet(alice, aliceAnchor.SweepTx.TxHash())
+	ht.AssertTransactionInWallet(alice, *sweepAllTxID)
+
+	// Next, we'll shutdown Alice, and allow 16 blocks to pass so that the
+	// anchor output can be swept by anyone. Rather than use the normal API
+	// call, we'll generate a series of _empty_ blocks here.
+	aliceRestart := ht.SuspendNode(alice)
+	const anchorCsv = 16
+	ht.MineEmptyBlocks(anchorCsv)
+
+	// Before we sweep the anchor, we'll restart Alice.
+	require.NoErrorf(ht, aliceRestart(), "unable to restart alice")
+
+	// Now that the channel has been closed, and Alice has an unconfirmed
+	// transaction spending the output produced by her anchor sweep, we'll
+	// mine a transaction that double spends the output.
+	thirdPartyAnchorSweep := genAnchorSweep(ht, aliceAnchor, anchorCsv)
+	ht.Miner.MineBlockWithTxes([]*btcutil.Tx{thirdPartyAnchorSweep})
+
+	// At this point, we should no longer find Alice's transaction that
+	// tried to sweep the anchor in her wallet.
+	ht.AssertTransactionNotInWallet(alice, aliceAnchor.SweepTx.TxHash())
+
+	// In addition, the transaction she sent to sweep all her coins to the
+	// miner also should no longer be found.
+	ht.AssertTransactionNotInWallet(alice, *sweepAllTxID)
+
+	// The anchor should now show as being "lost", while the force close
+	// response is still present.
+	assertAnchorOutputLost(ht, alice, aliceChanPoint1)
+
+	// At this point Alice's CSV output should already be fully spent and
+	// the channel marked as being resolved. We mine a block first, as so
+	// far we've been generating custom blocks this whole time.
+	commitSweepOp := wire.OutPoint{
+		Hash:  *forceCloseTxID,
+		Index: 1,
+	}
+	ht.Miner.AssertOutpointInMempool(commitSweepOp)
+	ht.MineBlocks(1)
+
+	ht.AssertNumWaitingClose(alice, 0)
+}
+
+// assertAnchorOutputLost asserts that the anchor output for the given channel
+// has the state of being lost.
+func assertAnchorOutputLost(ht *lntemp.HarnessTest, hn *node.HarnessNode,
+	chanPoint *lnrpc.ChannelPoint) {
+
+	cp := ht.OutPointFromChannelPoint(chanPoint)
+
+	expected := lnrpc.PendingChannelsResponse_ForceClosedChannel_LOST
+
+	err := wait.NoError(func() error {
+		resp := hn.RPC.PendingChannels()
+		channels := resp.PendingForceClosingChannels
+
+		for _, c := range channels {
+			// Not the wanted channel, skipped.
+			if c.Channel.ChannelPoint != cp.String() {
+				continue
+			}
+
+			// Found the channel, check the anchor state.
+			if c.Anchor == expected {
+				return nil
+			}
+
+			return fmt.Errorf("unexpected anchor state, want %v, "+
+				"got %v", expected, c.Anchor)
+		}
+
+		return fmt.Errorf("channel not found using cp=%v", cp)
+	}, defaultTimeout)
+	require.NoError(ht, err, "anchor doesn't show as being lost")
+}
+
 // genAnchorSweep generates a "3rd party" anchor sweeping from an existing one.
 // In practice, we just re-use the existing witness, and track on our own
 // output producing a 1-in-1-out transaction.
-func genAnchorSweep(t *harnessTest, net *lntest.NetworkHarness,
-	aliceAnchor *sweptOutput, anchorCsv uint32) *btcutil.Tx {
+func genAnchorSweep(ht *lntemp.HarnessTest,
+	aliceAnchor *lntemp.SweptOutput, anchorCsv uint32) *btcutil.Tx {
 
 	// At this point, we have the transaction that Alice used to try to
 	// sweep her anchor. As this is actually just something anyone can
@@ -414,7 +594,8 @@ func genAnchorSweep(t *harnessTest, net *lntest.NetworkHarness,
 			}
 		}
 
-		t.Fatalf("anchor op not found")
+		require.FailNow(ht, "anchor op not found")
+
 		return wire.TxIn{}
 	}()
 
@@ -423,14 +604,9 @@ func genAnchorSweep(t *harnessTest, net *lntest.NetworkHarness,
 	aliceAnchorTxIn.Witness[0] = nil
 	aliceAnchorTxIn.Sequence = anchorCsv
 
-	minerAddr, err := net.Miner.NewAddress()
-	if err != nil {
-		t.Fatalf("unable to get miner addr: %v", err)
-	}
+	minerAddr := ht.Miner.NewMinerAddress()
 	addrScript, err := txscript.PayToAddrScript(minerAddr)
-	if err != nil {
-		t.Fatalf("unable to gen addr script: %v", err)
-	}
+	require.NoError(ht, err, "unable to gen addr script")
 
 	// Now that we have the txIn, we can just make a new transaction that
 	// uses a different script for the output.
@@ -443,191 +619,3 @@ func genAnchorSweep(t *harnessTest, net *lntest.NetworkHarness,
 
 	return btcutil.NewTx(tx)
 }
-
-// testAnchorThirdPartySpend tests that if we force close a channel, but then
-// don't sweep the anchor in time and a 3rd party spends it, that we remove any
-// transactions that are a descendent of that sweep.
-func testAnchorThirdPartySpend(net *lntest.NetworkHarness, t *harnessTest) {
-	// First, we'll create two new nodes that both default to anchor
-	// channels.
-	//
-	// NOTE: The itests differ here as anchors is default off vs the normal
-	// lnd binary.
-	args := nodeArgsForCommitType(lnrpc.CommitmentType_ANCHORS)
-	alice := net.NewNode(t.t, "Alice", args)
-	defer shutdownAndAssert(net, t, alice)
-
-	bob := net.NewNode(t.t, "Bob", args)
-	defer shutdownAndAssert(net, t, bob)
-
-	ctxb := context.Background()
-	net.ConnectNodes(t.t, alice, bob)
-
-	// We'll fund our Alice with coins, as she'll be opening the channel.
-	// We'll fund her with *just* enough coins to open the channel.
-	const (
-		firstChanSize   = 1_000_000
-		anchorFeeBuffer = 500_000
-	)
-	net.SendCoins(t.t, firstChanSize, alice)
-
-	// We'll give Alice another spare UTXO as well so she can use it to
-	// help sweep all coins.
-	net.SendCoins(t.t, anchorFeeBuffer, alice)
-
-	// Open the channel between the two nodes and wait for it to confirm
-	// fully.
-	aliceChanPoint1 := openChannelAndAssert(
-		t, net, alice, bob, lntest.OpenChannelParams{
-			Amt: firstChanSize,
-		},
-	)
-
-	// With the channel open, we'll actually immediately force close it. We
-	// don't care about network announcements here since there's no routing
-	// in this test.
-	_, _, err := net.CloseChannel(alice, aliceChanPoint1, true)
-	if err != nil {
-		t.Fatalf("unable to execute force channel closure: %v", err)
-	}
-
-	// Now that the channel has been force closed, it should show up in the
-	// PendingChannels RPC under the waiting close section.
-	pendingChansRequest := &lnrpc.PendingChannelsRequest{}
-	ctxt, _ := context.WithTimeout(ctxb, defaultTimeout)
-	pendingChanResp, err := alice.PendingChannels(ctxt, pendingChansRequest)
-	if err != nil {
-		t.Fatalf("unable to query for pending channels: %v", err)
-	}
-	err = checkNumWaitingCloseChannels(pendingChanResp, 1)
-	if err != nil {
-		t.Fatalf(err.Error())
-	}
-
-	// Get the normal channel outpoint so we can track it in the set of
-	// channels that are waiting to be closed.
-	fundingTxID, err := lnrpc.GetChanPointFundingTxid(aliceChanPoint1)
-	if err != nil {
-		t.Fatalf("unable to get txid: %v", err)
-	}
-	chanPoint := wire.OutPoint{
-		Hash:  *fundingTxID,
-		Index: aliceChanPoint1.OutputIndex,
-	}
-	waitingClose, err := findWaitingCloseChannel(pendingChanResp, &chanPoint)
-	if err != nil {
-		t.Fatalf(err.Error())
-	}
-
-	// At this point, the channel is waiting close, and we have both the
-	// commitment transaction and anchor sweep in the mempool.
-	const expectedTxns = 2
-	sweepTxns, err := getNTxsFromMempool(
-		net.Miner.Client, expectedTxns, minerMempoolTimeout,
-	)
-	require.NoError(t.t, err, "no sweep txns in miner mempool")
-	aliceCloseTx := waitingClose.Commitments.LocalTxid
-	_, aliceAnchor := findCommitAndAnchor(t, net, sweepTxns, aliceCloseTx)
-
-	// We'll now mine _only_ the commitment force close transaction, as we
-	// want the anchor sweep to stay unconfirmed.
-	var emptyTime time.Time
-	forceCloseTxID, _ := chainhash.NewHashFromStr(aliceCloseTx)
-	commitTxn, err := net.Miner.Client.GetRawTransaction(
-		forceCloseTxID,
-	)
-	if err != nil {
-		t.Fatalf("unable to get transaction: %v", err)
-	}
-	_, err = net.Miner.GenerateAndSubmitBlock(
-		[]*btcutil.Tx{commitTxn}, -1, emptyTime,
-	)
-	if err != nil {
-		t.Fatalf("unable to generate block: %v", err)
-	}
-
-	// With the anchor output located, and the main commitment mined we'll
-	// instruct the wallet to send all coins in the wallet to a new address
-	// (to the miner), including unconfirmed change.
-	minerAddr, err := net.Miner.NewAddress()
-	if err != nil {
-		t.Fatalf("unable to create new miner addr: %v", err)
-	}
-	sweepReq := &lnrpc.SendCoinsRequest{
-		Addr:             minerAddr.String(),
-		SendAll:          true,
-		MinConfs:         0,
-		SpendUnconfirmed: true,
-	}
-	ctxt, _ = context.WithTimeout(ctxb, defaultTimeout)
-	sweepAllResp, err := alice.SendCoins(ctxt, sweepReq)
-	if err != nil {
-		t.Fatalf("unable to sweep coins: %v", err)
-	}
-
-	// Both the original anchor sweep transaction, as well as the
-	// transaction we created to sweep all the coins from Alice's wallet
-	// should be found in her transaction store.
-	sweepAllTxID, _ := chainhash.NewHashFromStr(sweepAllResp.Txid)
-	assertTransactionInWallet(t.t, alice, aliceAnchor.SweepTx.TxHash())
-	assertTransactionInWallet(t.t, alice, *sweepAllTxID)
-
-	// Next, we'll shutdown Alice, and allow 16 blocks to pass so that the
-	// anchor output can be swept by anyone. Rather than use the normal API
-	// call, we'll generate a series of _empty_ blocks here.
-	aliceRestart, err := net.SuspendNode(alice)
-	if err != nil {
-		t.Fatalf("unable to shutdown alice: %v", err)
-	}
-	const anchorCsv = 16
-	for i := 0; i < anchorCsv; i++ {
-		_, err := net.Miner.GenerateAndSubmitBlock(nil, -1, emptyTime)
-		if err != nil {
-			t.Fatalf("unable to generate block: %v", err)
-		}
-	}
-
-	// Before we sweep the anchor, we'll restart Alice.
-	if err := aliceRestart(); err != nil {
-		t.Fatalf("unable to restart alice: %v", err)
-	}
-
-	// Now that the channel has been closed, and Alice has an unconfirmed
-	// transaction spending the output produced by her anchor sweep, we'll
-	// mine a transaction that double spends the output.
-	thirdPartyAnchorSweep := genAnchorSweep(t, net, aliceAnchor, anchorCsv)
-	_, err = net.Miner.GenerateAndSubmitBlock(
-		[]*btcutil.Tx{thirdPartyAnchorSweep}, -1, emptyTime,
-	)
-	if err != nil {
-		t.Fatalf("unable to generate block: %v", err)
-	}
-
-	// At this point, we should no longer find Alice's transaction that
-	// tried to sweep the anchor in her wallet.
-	assertTransactionNotInWallet(t.t, alice, aliceAnchor.SweepTx.TxHash())
-
-	// In addition, the transaction she sent to sweep all her coins to the
-	// miner also should no longer be found.
-	assertTransactionNotInWallet(t.t, alice, *sweepAllTxID)
-
-	// The anchor should now show as being "lost", while the force close
-	// response is still present.
-	assertAnchorOutputLost(t, alice, chanPoint)
-
-	// At this point Alice's CSV output should already be fully spent and
-	// the channel marked as being resolved. We mine a block first, as so
-	// far we've been generating custom blocks this whole time..
-	commitSweepOp := wire.OutPoint{
-		Hash:  *forceCloseTxID,
-		Index: 1,
-	}
-	assertSpendingTxInMempool(
-		t, net.Miner.Client, minerMempoolTimeout, commitSweepOp,
-	)
-	_, err = net.Miner.Client.Generate(1)
-	if err != nil {
-		t.Fatalf("unable to generate block: %v", err)
-	}
-	assertNumPendingChannels(t, alice, 0, 0)
-}

lntest/itest/lnd_test_list_on_test.go

@@ -194,10 +194,6 @@ var allTestCases = []*testCase{
 		name: "remote signer",
 		test: testRemoteSigner,
 	},
-	{
-		name: "3rd party anchor spend",
-		test: testAnchorThirdPartySpend,
-	},
 	{
 		name: "taproot",
 		test: testTaproot,