lnd_test: extend chain claim test with invoice settled check

In this commit, we extend the remote/receiver chain claim integration
test to assert that the on-disk representation of the invoice on the
receiving side (Carol) is marked as settled due to the claiming the HTLC
on-chain.

lnd_test.go

@@ -4,23 +4,20 @@ package main
 
 import (
 	"bytes"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/hex"
 	"fmt"
 	"io"
 	"io/ioutil"
 	"os"
 	"path/filepath"
+	"reflect"
 	"strings"
+	"sync/atomic"
 	"testing"
 	"time"
 
-	"sync/atomic"
-
-	"encoding/hex"
-	"reflect"
-
-	"crypto/rand"
-	"crypto/sha256"
-
 	"github.com/btcsuite/btcd/btcjson"
 	"github.com/btcsuite/btcd/chaincfg"
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
@@ -9320,8 +9317,9 @@ func testMultiHopReceiverChainClaim(net *lntest.NetworkHarness, t *harnessTest)
 	defer shutdownAndAssert(net, t, carol)
 
 	// With the network active, we'll now add a new invoice at Carol's end.
+	const invoiceAmt = 100000
 	invoiceReq := &lnrpc.Invoice{
-		Value: 100000,
+		Value: invoiceAmt,
 	}
 	ctxt, _ := context.WithTimeout(ctxb, defaultTimeout)
 	carolInvoice, err := carol.AddInvoice(ctxt, invoiceReq)
@@ -9527,6 +9525,25 @@ func testMultiHopReceiverChainClaim(net *lntest.NetworkHarness, t *harnessTest)
 		t.Fatalf(predErr.Error())
 	}
 
+	// The invoice should show as settled for Carol, indicating that it was
+	// swept on-chain.
+	invoicesReq := &lnrpc.ListInvoiceRequest{}
+	invoicesResp, err := carol.ListInvoices(ctxb, invoicesReq)
+	if err != nil {
+		t.Fatalf("unable to retrieve invoices: %v", err)
+	}
+	if len(invoicesResp.Invoices) != 1 {
+		t.Fatalf("expected 1 invoice, got %d", len(invoicesResp.Invoices))
+	}
+	invoice := invoicesResp.Invoices[0]
+	if invoice.State != lnrpc.Invoice_SETTLED {
+		t.Fatalf("expected invoice to be settled on chain")
+	}
+	if invoice.AmtPaidSat != invoiceAmt {
+		t.Fatalf("expected invoice to be settled with %d sat, got "+
+			"%d sat", invoiceAmt, invoice.AmtPaidSat)
+	}
+
 	// We'll close out the channel between Alice and Bob, then shutdown
 	// carol to conclude the test.
 	ctxt, _ = context.WithTimeout(ctxb, channelCloseTimeout)
@@ -10368,8 +10385,9 @@ func testMultiHopHtlcRemoteChainClaim(net *lntest.NetworkHarness, t *harnessTest
 	defer shutdownAndAssert(net, t, carol)
 
 	// With the network active, we'll now add a new invoice at Carol's end.
+	const invoiceAmt = 100000
 	invoiceReq := &lnrpc.Invoice{
-		Value: 100000,
+		Value: invoiceAmt,
 	}
 	ctxt, _ := context.WithTimeout(ctxb, defaultTimeout)
 	carolInvoice, err := carol.AddInvoice(ctxt, invoiceReq)
@@ -10611,6 +10629,25 @@ func testMultiHopHtlcRemoteChainClaim(net *lntest.NetworkHarness, t *harnessTest
 	if err != nil {
 		t.Fatalf(predErr.Error())
 	}
+
+	// The invoice should show as settled for Carol, indicating that it was
+	// swept on-chain.
+	invoicesReq := &lnrpc.ListInvoiceRequest{}
+	invoicesResp, err := carol.ListInvoices(ctxb, invoicesReq)
+	if err != nil {
+		t.Fatalf("unable to retrieve invoices: %v", err)
+	}
+	if len(invoicesResp.Invoices) != 1 {
+		t.Fatalf("expected 1 invoice, got %d", len(invoicesResp.Invoices))
+	}
+	invoice := invoicesResp.Invoices[0]
+	if invoice.State != lnrpc.Invoice_SETTLED {
+		t.Fatalf("expected invoice to be settled on chain")
+	}
+	if invoice.AmtPaidSat != invoiceAmt {
+		t.Fatalf("expected invoice to be settled with %d sat, got "+
+			"%d sat", invoiceAmt, invoice.AmtPaidSat)
+	}
 }
 
 // testSwitchCircuitPersistence creates a multihop network to ensure the sender